SERVICE MANUAL

Date: 2012/07/12

Table of ContentsRevision history......................................................................................................................................1A SAFETY AND IMPORTANT WARNING ITEMS............................................................................A-1

1. IMPORTANT NOTICE.................................................................................................................................................A-22. DESCRIPTION ITEMS FOR DANGER, WARNING AND CAUTION..........................................................................A-3

2.1 Description items in this Service Manual...................................................................................................................................A-32.2 Description items for safety and important warning items.........................................................................................................A-3

3. SAFETY WARNINGS..................................................................................................................................................A-43.1 MODIFICATIONS NOT AUTHORIZED BY KONICA MINOLTA BUSINESS TECHNOLOGIES, INC......................................A-4

3.1.1 Actions requiring special attention...................................................................................................................................A-43.2 POWER PLUG SELECTION.....................................................................................................................................................A-5

3.2.1 Power Cord Set or Power Plug.......................................................................................................................................A-53.3 CHECKPOINTS WHEN PERFORMING ON-SITE SERVICE...................................................................................................A-6

3.3.1 Power Supply..................................................................................................................................................................A-73.3.2 Installation Requirements..............................................................................................................................................A-113.3.3 After Service..................................................................................................................................................................A-13

3.4 FUSE.......................................................................................................................................................................................A-183.5 Used Batteries Precautions.....................................................................................................................................................A-19

3.5.1 ALL Areas......................................................................................................................................................................A-193.5.2 Germany........................................................................................................................................................................A-193.5.3 France...........................................................................................................................................................................A-193.5.4 Denmark........................................................................................................................................................................A-193.5.5 Finland, Sweden............................................................................................................................................................A-193.5.6 Norway..........................................................................................................................................................................A-19

3.6 Laser Safety............................................................................................................................................................................A-203.6.1 Laser Safety..................................................................................................................................................................A-203.6.2 Internal Laser Radiation................................................................................................................................................A-203.6.3 Laser Safety Label........................................................................................................................................................A-233.6.4 Laser Caution Label......................................................................................................................................................A-233.6.5 PRECAUTIONS FOR HANDLING THE LASER EQUIPMENT.....................................................................................A-24

4. WARNING INDICATIONS ON THE MACHINE.........................................................................................................A-254.1 Warning indications inside the machine..................................................................................................................................A-254.2 Warning indications on the boards..........................................................................................................................................A-26

5. MEASURES TO TAKE IN CASE OF AN ACCIDENT...............................................................................................A-27B NOTATION OF THE CONTENTS..................................................................................................B-1

1. NOTATION OF THE CONTENTS...............................................................................................................................B-11.1 Product name............................................................................................................................................................................B-11.2 Brand name...............................................................................................................................................................................B-11.3 Paper feed direction..................................................................................................................................................................B-1

C PRODUCT SPECIFICATIONS......................................................................................................C-11. bizhub 185/165............................................................................................................................................................C-1

1.1 Type..........................................................................................................................................................................................C-11.2 Functions...................................................................................................................................................................................C-11.3 Paper.........................................................................................................................................................................................C-11.4 Materials....................................................................................................................................................................................C-21.5 Print volume..............................................................................................................................................................................C-2

1.5.1 bizhub 185.......................................................................................................................................................................C-21.5.2 bizhub 165.......................................................................................................................................................................C-2

1.6 Machine specifications..............................................................................................................................................................C-21.7 Operating environment..............................................................................................................................................................C-21.8 Print function.............................................................................................................................................................................C-21.9 Scan function.............................................................................................................................................................................C-3

D OVERALL COMPOSITION............................................................................................................D-11. SYSTEM CONFIGURATION......................................................................................................................................D-12. CROSS SECTIONAL VIEW........................................................................................................................................D-23. PAPER PATH.............................................................................................................................................................D-34. OVERALL CONFIGRATION.......................................................................................................................................D-4

4.1 Control Block Diagram..............................................................................................................................................................D-44.2 Image creation process ............................................................................................................................................................D-4

E SERVICE TOOL.............................................................................................................................E-11. Service material list.....................................................................................................................................................E-12. CE tool list...................................................................................................................................................................E-2

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F MAINTENANCE..............................................................................................................................F-11. Concept of periodical maintenance.............................................................................................................................F-1

1.1 Concept of periodical maintenance...........................................................................................................................................F-11.2 Main body..................................................................................................................................................................................F-1

1.2.1 Periodical maintenance 1 (Total counter; every 55,000 counts).....................................................................................F-11.2.2 Periodical maintenance 2 (PM counter; every 100,000 counts)......................................................................................F-1

2. PERIODICAL MAINTENANCE ITEMS........................................................................................................................F-22.1 Periodical replacement parts list................................................................................................................................................F-2

2.1.1 Periodical replacement parts list......................................................................................................................................F-22.1.2 Main body........................................................................................................................................................................F-2

2.2 Periodical cleaning parts list......................................................................................................................................................F-22.2.1 Main Body........................................................................................................................................................................F-2

2.3 Concept of parts life...................................................................................................................................................................F-22.3.1 Life value of consumables and parts...............................................................................................................................F-22.3.2 Conditions for life specifications values...........................................................................................................................F-2

3. PERIODICAL MAINTENANCE PROCEDURE............................................................................................................F-4Periodical Maintenance Procedure...................................................................................................................................................F-43.1 Processing section.....................................................................................................................................................................F-4

3.1.1 Replacing the developer..................................................................................................................................................F-43.1.2 Replacing the drum.........................................................................................................................................................F-63.1.3 Replacing the drum charge corona assy.........................................................................................................................F-73.1.4 Replacing the cleaning blade..........................................................................................................................................F-73.1.5 Application of toner..........................................................................................................................................................F-83.1.6 Replacing the toner bottle................................................................................................................................................F-93.1.7 Cleaning of the Ds collars..............................................................................................................................................F-103.1.8 Cleaning of the drum separator fingers.........................................................................................................................F-113.1.9 Cleaning of the developer scattering prevention plate..................................................................................................F-11

3.2 Conveyance section................................................................................................................................................................F-133.2.1 Cleaning of the timing roller...........................................................................................................................................F-133.2.2 Cleaning of the pre-image transfer guide plate.............................................................................................................F-13

3.3 Fusing section..........................................................................................................................................................................F-143.3.1 Replacing the fusing unit...............................................................................................................................................F-14

G DISASSEMBLING/REASSEMBLING............................................................................................G-11. Disassembly/adjustment prohibited items...................................................................................................................G-1

1.1 Disassembly/adjustment prohibited items.................................................................................................................................G-11.1.1 Paint-locked screws........................................................................................................................................................G-11.1.2 Red-painted screws........................................................................................................................................................G-11.1.3 Variable resistors on board.............................................................................................................................................G-11.1.4 Removal of PWBs...........................................................................................................................................................G-11.1.5 Warnings for disassembly...............................................................................................................................................G-21.1.6 Precautions/warnings during setup or transportation......................................................................................................G-2

1.2 PH unit......................................................................................................................................................................................G-31.2.1 Reason for prohibition.....................................................................................................................................................G-3

1.3 Fusing unit.................................................................................................................................................................................G-31.3.1 Reason for prohibition.....................................................................................................................................................G-3

2. Disassembly/reassembly parts list..............................................................................................................................G-43. Disassembly/reassembly procedure...........................................................................................................................G-5

3.1 Front door..................................................................................................................................................................................G-53.1.1 Procedure.......................................................................................................................................................................G-5

3.2 Front cover................................................................................................................................................................................G-53.2.1 Procedure.......................................................................................................................................................................G-5

3.3 Left cover..................................................................................................................................................................................G-53.3.1 Procedure.......................................................................................................................................................................G-5

3.4 Rear right cover/1, Rear right cover/2.......................................................................................................................................G-63.4.1 Procedure.......................................................................................................................................................................G-6

3.5 Rear cover.................................................................................................................................................................................G-63.5.1 Procedure.......................................................................................................................................................................G-6

3.6 Scanner right cover...................................................................................................................................................................G-63.6.1 Procedure.......................................................................................................................................................................G-6

3.7 Scanner rear cover....................................................................................................................................................................G-63.7.1 Procedure.......................................................................................................................................................................G-6

3.8 Paper exit tray (left) / Paper exit tray (right)..............................................................................................................................G-73.8.1 Procedure.......................................................................................................................................................................G-7

3.9 Original glass............................................................................................................................................................................G-83.9.1 Procedure.......................................................................................................................................................................G-8

3.10 Operation panel.......................................................................................................................................................................G-93.10.1 Procedure.....................................................................................................................................................................G-9

3.11 Tray 1......................................................................................................................................................................................G-9

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3.11.1 Procedure.....................................................................................................................................................................G-93.12 Multi bypass tray.....................................................................................................................................................................G-9

3.12.1 Procedure.....................................................................................................................................................................G-93.13 Imaging unit...........................................................................................................................................................................G-10

3.13.1 Procedure...................................................................................................................................................................G-103.14 PH unit..................................................................................................................................................................................G-11

3.14.1 Procedure...................................................................................................................................................................G-113.15 CIS module (CIS)..................................................................................................................................................................G-12

3.15.1 Procedure...................................................................................................................................................................G-123.16 Transfer roller unit.................................................................................................................................................................G-13

3.16.1 Procedure...................................................................................................................................................................G-133.17 Scanner unit..........................................................................................................................................................................G-13

3.17.1 Procedure...................................................................................................................................................................G-133.18 Printer control board (PRCB)................................................................................................................................................G-14

3.18.1 Procedure...................................................................................................................................................................G-143.19 High voltage unit (HV1).........................................................................................................................................................G-14

3.19.1 Procedure...................................................................................................................................................................G-143.20 DC power supply (DCPU).....................................................................................................................................................G-15

3.20.1 Procedure...................................................................................................................................................................G-153.21 Tray 1 feed roller...................................................................................................................................................................G-15

3.21.1 Procedure...................................................................................................................................................................G-153.22 Tray 1 separation pad...........................................................................................................................................................G-16

3.22.1 Procedure...................................................................................................................................................................G-163.23 Ozone filter............................................................................................................................................................................G-17

3.23.1 Procedure...................................................................................................................................................................G-173.24 Multi bypass tray feed roller..................................................................................................................................................G-17

3.24.1 Procedure...................................................................................................................................................................G-173.25 Multi bypass tray separation roller assy................................................................................................................................G-18

3.25.1 Procedure...................................................................................................................................................................G-183.26 Main motor (M1)....................................................................................................................................................................G-19

3.26.1 Procedure...................................................................................................................................................................G-193.27 Toner supply motor (M2).......................................................................................................................................................G-19

3.27.1 Procedure...................................................................................................................................................................G-193.28 Scanner motor (M4)..............................................................................................................................................................G-20

3.28.1 Procedure...................................................................................................................................................................G-203.29 DC power supply fan motor (FM5)........................................................................................................................................G-21

3.29.1 Procedure...................................................................................................................................................................G-213.30 Registration clutch (CL1).......................................................................................................................................................G-21

3.30.1 Procedure...................................................................................................................................................................G-213.31 Tray1 paper feed clutch (CL2)..............................................................................................................................................G-21

3.31.1 Procedure...................................................................................................................................................................G-213.32 Bypass paper feed clutch (CL3)............................................................................................................................................G-22

3.32.1 Procedure...................................................................................................................................................................G-223.33 Bypass pick-up solenoid (SD1).............................................................................................................................................G-22

3.33.1 Procedure...................................................................................................................................................................G-22H CLEANING/LUBRICATION...........................................................................................................H-1

1. Cleaning parts list........................................................................................................................................................H-12. Cleaning procedure.....................................................................................................................................................H-2

2.1 Tray 1 feed roller.......................................................................................................................................................................H-22.1.1 Procedure........................................................................................................................................................................H-2

2.2 Tray 1 separation pad...............................................................................................................................................................H-22.2.1 Procedure........................................................................................................................................................................H-2

2.3 Original glass ............................................................................................................................................................................H-22.3.1 Procedure........................................................................................................................................................................H-2

2.4 Multi bypass tray separation roller.............................................................................................................................................H-22.4.1 Procedure........................................................................................................................................................................H-2

2.5 Multi bypass tray feed roller .....................................................................................................................................................H-32.5.1 Procedure........................................................................................................................................................................H-3

I ADJUSTMENT/SETTING.................................................................................................................I-11. HOW TO USE THE ADJUSTMENT SECTION............................................................................................................I-1

1.1 Advance checks..........................................................................................................................................................................I-11.2 Precautions for service jobs........................................................................................................................................................I-1

2. UTILITY MODE.............................................................................................................................................................I-22.1 List of utility mode.......................................................................................................................................................................I-22.2 Starting/Exiting............................................................................................................................................................................I-2

2.2.1 Starting procedure............................................................................................................................................................I-22.2.2 Exiting procedure..............................................................................................................................................................I-2

2.3 MACHINE SETTING...................................................................................................................................................................I-2

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2.3.1 AUTO PANEL RESET......................................................................................................................................................I-22.3.2 SLEEP MODE..................................................................................................................................................................I-32.3.3 SLEEP SHIFT...................................................................................................................................................................I-32.3.4 DENSITY (BOOK)............................................................................................................................................................I-32.3.5 PRINT DENSITY..............................................................................................................................................................I-32.3.6 LCD CONTRAST..............................................................................................................................................................I-32.3.7 KEY SPEED SETTING.....................................................................................................................................................I-32.3.8 LANGUAGE......................................................................................................................................................................I-32.3.9 STATUS LED....................................................................................................................................................................I-4

2.4 SHORTCUT SETTING...............................................................................................................................................................I-42.4.1 COMBINE ORIGINAL.......................................................................................................................................................I-42.4.2 SORT................................................................................................................................................................................I-42.4.3 ERASE..............................................................................................................................................................................I-42.4.4 BOOK SEPARATION.......................................................................................................................................................I-5

2.5 CUSTOM SIZE MEMORY..........................................................................................................................................................I-52.5.1 CUSTOME SIZE MEMORY..............................................................................................................................................I-5

2.6 USER MANAGEMENT...............................................................................................................................................................I-52.6.1 DRUM DEHUMIDIFY........................................................................................................................................................I-5

2.7 JOB SETTING............................................................................................................................................................................I-52.7.1 TRAY PRIORITY..............................................................................................................................................................I-52.7.2 TRAY1 PAPER.................................................................................................................................................................I-52.7.3 BYPASS PAPER..............................................................................................................................................................I-52.7.4 PRINT PRIORITY.............................................................................................................................................................I-62.7.5 CRISSCROSS MODE......................................................................................................................................................I-6

2.8 COPY SETTING.........................................................................................................................................................................I-62.8.1 QUALITY PRIORITY........................................................................................................................................................I-62.8.2 DENSITY PRIORITY........................................................................................................................................................I-62.8.3 DENSITY LEVEL..............................................................................................................................................................I-62.8.4 ERASE SETTING.............................................................................................................................................................I-72.8.5 SORT PRIORITY..............................................................................................................................................................I-72.8.6 4IN1 COPY ORDER.........................................................................................................................................................I-7

2.9 TOTAL PAGE.............................................................................................................................................................................I-72.9.1 TOTAL COUNT................................................................................................................................................................I-72.9.2 SIZE COUNT....................................................................................................................................................................I-72.9.3 TOTAL SCAN...................................................................................................................................................................I-7

3. ADJUSTMENT ITEM LIST...........................................................................................................................................I-83.1 List 1...........................................................................................................................................................................................I-83.2 List 2...........................................................................................................................................................................................I-9

4. SERVICE MODE........................................................................................................................................................I-104.1 List of SERVICE MODE............................................................................................................................................................I-104.2 Starting/Exiting..........................................................................................................................................................................I-11

4.2.1 Starting procedure..........................................................................................................................................................I-114.2.2 Exiting procedure............................................................................................................................................................I-114.2.3 Changing the setting value in SERVICE MODE functions.............................................................................................I-11

4.3 SERVICE'S CHOICE................................................................................................................................................................I-114.3.1 SHIPMENT.....................................................................................................................................................................I-114.3.2 POWER SUPPLY...........................................................................................................................................................I-114.3.3 MAINTENANCE COUNT................................................................................................................................................I-114.3.4 IU LIFE STOP MODE.....................................................................................................................................................I-124.3.5 ID ADJUST.....................................................................................................................................................................I-124.3.6 VG ADJUST....................................................................................................................................................................I-124.3.7 TRANSFER (PLAIN)/(RECYCLE)/(CARD1)/(CARD2)...................................................................................................I-124.3.8 FUSER TEMP. (PLAIN)..................................................................................................................................................I-124.3.9 FUSER TEMP. (CARD1)/(CARD2)................................................................................................................................I-134.3.10 LEADING EDGE...........................................................................................................................................................I-134.3.11 TRAILING EDGE..........................................................................................................................................................I-134.3.12 VERTICAL EDGE.........................................................................................................................................................I-144.3.13 LOOP Ad. (TRAY1)......................................................................................................................................................I-144.3.14 LOOP Ad. (BYPASS)....................................................................................................................................................I-144.3.15 FLS PAPER SIZE.........................................................................................................................................................I-154.3.16 GDI TIMEOUT..............................................................................................................................................................I-154.3.17 ERASER INSTALL.......................................................................................................................................................I-154.3.18 SUCTION FAN.............................................................................................................................................................I-154.3.19 LANGUAGE GROUP....................................................................................................................................................I-15

4.4 ADJUST....................................................................................................................................................................................I-154.4.1 PRN MAIN (TRAY1).......................................................................................................................................................I-154.4.2 PRN MAIN (BYPASS)....................................................................................................................................................I-164.4.3 PRN SUB (TRAY1-P).....................................................................................................................................................I-164.4.4 PRN SUB (TRAY1-R).....................................................................................................................................................I-174.4.5 PRN SUB (TRAY1-C1)...................................................................................................................................................I-18

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4.4.6 PRN SUB (TRAY1-C2)...................................................................................................................................................I-184.4.7 PRN SUB (BYPASS-P)..................................................................................................................................................I-194.4.8 PRN SUB (BYPASS-R)..................................................................................................................................................I-194.4.9 PRN SUB (BYPASS-C1)................................................................................................................................................I-204.4.10 PRN SUB (BYPASS-C2)..............................................................................................................................................I-204.4.11 CIS MAIN ZOOM..........................................................................................................................................................I-214.4.12 CIS SUB ZOOM............................................................................................................................................................I-224.4.13 CIS MAIN REGIST.......................................................................................................................................................I-224.4.14 CIS SUB REGIST.........................................................................................................................................................I-234.4.15 TCR GAIN.....................................................................................................................................................................I-244.4.16 MODEL SETTING........................................................................................................................................................I-24

4.5 COUNTER................................................................................................................................................................................I-244.5.1 TOTAL COUNTER.........................................................................................................................................................I-244.5.2 SIZE COUNTER.............................................................................................................................................................I-244.5.3 PM COUNTER................................................................................................................................................................I-244.5.4 MAINTENANCE COUNT................................................................................................................................................I-244.5.5 SUPPLIES COUNTER...................................................................................................................................................I-254.5.6 APPLICATIN COUNTER................................................................................................................................................I-254.5.7 SCAN COUNTER...........................................................................................................................................................I-254.5.8 PAPER SIZE COUNTER................................................................................................................................................I-254.5.9 MISFEED COUNTER.....................................................................................................................................................I-254.5.10 TROUBLE COUNTER..................................................................................................................................................I-25

4.6 DISPLAY...................................................................................................................................................................................I-254.6.1 TONER DENSITY...........................................................................................................................................................I-254.6.2 FUSER TEMPERATURE...............................................................................................................................................I-254.6.3 TRANSCRIPT CURRENT..............................................................................................................................................I-264.6.4 TCR GAIN.......................................................................................................................................................................I-264.6.5 PROCESS CONTROL....................................................................................................................................................I-264.6.6 MAIN F/W VER...............................................................................................................................................................I-264.6.7 ENGINE F/W VER..........................................................................................................................................................I-264.6.8 MAIN RAM SIZE.............................................................................................................................................................I-264.6.9 SERIAL NO.....................................................................................................................................................................I-264.6.10 CUSTOMER ID.............................................................................................................................................................I-26

4.7 FUNCTION...............................................................................................................................................................................I-264.7.1 PAPER FEED TEST.......................................................................................................................................................I-264.7.2 PROCESS CHECK.........................................................................................................................................................I-264.7.3 TCR AUTO ADJUST......................................................................................................................................................I-264.7.4 PRN TEST PATTERN....................................................................................................................................................I-274.7.5 SCAN TEST....................................................................................................................................................................I-284.7.6 TONER SUPPLY............................................................................................................................................................I-28

4.8 REPORT...................................................................................................................................................................................I-284.8.1 SETTING DATA LIST.....................................................................................................................................................I-28

4.9 FIXED ZOOM CHANGE...........................................................................................................................................................I-284.9.1 Use.................................................................................................................................................................................I-284.9.2 Procedure.......................................................................................................................................................................I-284.9.3 Default values and setting range of fixed zoom ratios....................................................................................................I-29

4.10 FACTORY TEST.....................................................................................................................................................................I-294.10.1 PANEL TEST................................................................................................................................................................I-294.10.2 RAM TEST....................................................................................................................................................................I-29

4.11 CLEAR DATA.........................................................................................................................................................................I-304.11.1 MEMORY CLEAR.........................................................................................................................................................I-304.11.2 TOTAL CLEAR.............................................................................................................................................................I-304.11.3 PM COUNTER..............................................................................................................................................................I-304.11.4 MAINTENANCE COUNTER.........................................................................................................................................I-304.11.5 SUPPLIES COUNTER.................................................................................................................................................I-304.11.6 APPLICATION COUNT................................................................................................................................................I-304.11.7 SCAN COUNTER.........................................................................................................................................................I-304.11.8 PAPER SIZE COUNTER..............................................................................................................................................I-304.11.9 MISFEED COUNTER...................................................................................................................................................I-304.11.10 TROUBLE COUNTER................................................................................................................................................I-30

5. SECURITY MODE......................................................................................................................................................I-315.1 List of SECURITY mode...........................................................................................................................................................I-315.2 Starting/Exiting..........................................................................................................................................................................I-31

5.2.1 Starting procedure..........................................................................................................................................................I-315.2.2 Exiting procedure............................................................................................................................................................I-31

5.3 SECURITY................................................................................................................................................................................I-315.3.1 TOTAL COUNTER.........................................................................................................................................................I-315.3.2 SIZE COUNTER.............................................................................................................................................................I-315.3.3 Count-up table................................................................................................................................................................I-31

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J REWRITING OF FIRMWARE.........................................................................................................J-11. Rewriting the firmware.................................................................................................................................................J-1

1.1 Outline........................................................................................................................................................................................J-11.2 Preparation.................................................................................................................................................................................J-11.3 Rewriting method.......................................................................................................................................................................J-1

2. Procedure when upgrading the firmware has failed.....................................................................................................J-3K TROUBLESHOOTING...................................................................................................................K-1

1. JAM DISPLAY.............................................................................................................................................................K-11.1 Misfeed display..........................................................................................................................................................................K-1

1.1.1 Misfeed display................................................................................................................................................................K-11.1.2 Display resetting procedure.............................................................................................................................................K-1

1.2 Sensor layout.............................................................................................................................................................................K-11.2.1 System mounted with MB-503........................................................................................................................................K-1

1.3 Solution......................................................................................................................................................................................K-11.3.1 Initial check items............................................................................................................................................................K-11.3.2 Misfeed at tray1 paper feed section................................................................................................................................K-21.3.3 Misfeed at the bypass tray paper feed section................................................................................................................K-21.3.4 Misfeed at the image transfer section.............................................................................................................................K-21.3.5 Misfeed at the fusing/exit section....................................................................................................................................K-3

2. MALFUNCTION CODE...............................................................................................................................................K-52.1 Trouble code..............................................................................................................................................................................K-5

2.1.1 Trouble code...................................................................................................................................................................K-52.1.2 Trouble code list..............................................................................................................................................................K-5

2.2 Trouble resetting procedure......................................................................................................................................................K-62.2.1 Trouble resetting procedure............................................................................................................................................K-6

2.3 Solution......................................................................................................................................................................................K-62.3.1 C0211..............................................................................................................................................................................K-62.3.2 C2351..............................................................................................................................................................................K-62.3.3 C2557, C2558, C255C....................................................................................................................................................K-72.3.4 C2702..............................................................................................................................................................................K-72.3.5 C3451, C3751, C3752, C3851........................................................................................................................................K-72.3.6 C4001, C4101.................................................................................................................................................................K-82.3.7 C5102..............................................................................................................................................................................K-82.3.8 C6101..............................................................................................................................................................................K-82.3.9 C9401..............................................................................................................................................................................K-92.3.10 CC102...........................................................................................................................................................................K-92.3.11 CC151, CC153..............................................................................................................................................................K-92.3.12 CC163...........................................................................................................................................................................K-9

3. POWER SUPPLY TROUBLE....................................................................................................................................K-113.1 The copier does not turn ON...................................................................................................................................................K-11

4. IMAGE QUALITY PROBLEM....................................................................................................................................K-124.1 How to identify problematic part..............................................................................................................................................K-12

4.1.1 Outline...........................................................................................................................................................................K-124.1.2 Initial check items..........................................................................................................................................................K-124.1.3 Identification of the faulty system..................................................................................................................................K-12

4.2 Solution....................................................................................................................................................................................K-124.2.1 Scanner section: Blank copy.........................................................................................................................................K-124.2.2 Scanner section: Black copy.........................................................................................................................................K-134.2.3 Scanner section: Low image density.............................................................................................................................K-134.2.4 Scanner section: Foggy background or rough image....................................................................................................K-134.2.5 Scanner section: Black streaks or bands......................................................................................................................K-144.2.6 Scanner section: Black spots........................................................................................................................................K-144.2.7 Scanner section: White streaks or bands......................................................................................................................K-144.2.8 Scanner section: Uneven image density.......................................................................................................................K-154.2.9 Scanner section: Gradation reproduction failure...........................................................................................................K-154.2.10 Scanner section: Periodically uneven image...............................................................................................................K-164.2.11 Scanner section: Moire................................................................................................................................................K-164.2.12 Printer section: Blank copy..........................................................................................................................................K-174.2.13 Printer section: Black copy..........................................................................................................................................K-174.2.14 Printer section: Low image density..............................................................................................................................K-174.2.15 Printer section: Foggy background or rough image....................................................................................................K-184.2.16 Printer section: Black streaks or bands.......................................................................................................................K-194.2.17 Printer section: Black spots.........................................................................................................................................K-194.2.18 Printer section: Blank streaks or bands.......................................................................................................................K-194.2.19 Printer section: Void areas..........................................................................................................................................K-204.2.20 Printer section: Smear on back...................................................................................................................................K-204.2.21 Printer section: Uneven image density........................................................................................................................K-214.2.22 Printer section: Gradation reproduction failure............................................................................................................K-21

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4.2.23 Printer section: Periodically uneven image.................................................................................................................K-22L PARTS/CONNECTOR LAYOUT DRAWING..................................................................................L-1

1. PARTS LAYOUT DRAWING.......................................................................................................................................L-11.1 Main body..................................................................................................................................................................................L-11.2 Multi bypass tray (MB-503)........................................................................................................................................................L-3

2. CONNECTOR LAYOUT DRAWING............................................................................................................................L-42.1 Printer control board (PRCB).....................................................................................................................................................L-42.2 Main body..................................................................................................................................................................................L-4

M TIMING CHART............................................................................................................................M-11. Timing chart at print start............................................................................................................................................M-1

1.1 Operating conditions.................................................................................................................................................................M-11.2 Timing chart..............................................................................................................................................................................M-11.3 Process speed..........................................................................................................................................................................M-1

N WIRING DIAGRAM........................................................................................................................N-11. bizhub 185/165............................................................................................................................................................N-1

O THEORY OF OPERATION bizhub 185/165..................................................................................O-11. INTERFACE SECTION...............................................................................................................................................O-1

1.1 Configuration.............................................................................................................................................................................O-12. SCANNER SECTION.................................................................................................................................................O-2

2.1 Configuration.............................................................................................................................................................................O-22.2 Drive..........................................................................................................................................................................................O-22.3 Operation..................................................................................................................................................................................O-2

2.3.1 Control when the Start key is pressed............................................................................................................................O-23. WRITING SECTION...................................................................................................................................................O-3

3.1 Configuration.............................................................................................................................................................................O-33.2 Operation..................................................................................................................................................................................O-3

3.2.1 Overview.........................................................................................................................................................................O-33.2.2 Laser emission area........................................................................................................................................................O-4

4. TONER SUPPLY SECTION.......................................................................................................................................O-54.1 Configuration.............................................................................................................................................................................O-54.2 Drive..........................................................................................................................................................................................O-54.3 Operation..................................................................................................................................................................................O-5

4.3.1 Toner Replenishing Mechanism.....................................................................................................................................O-54.3.2 Toner Replenishing Control............................................................................................................................................O-64.3.3 T/C Recovery Mode........................................................................................................................................................O-64.3.4 Detection of toner empty condition.................................................................................................................................O-7

5. IMAGING UNIT SECTION..........................................................................................................................................O-85.1 Configuration.............................................................................................................................................................................O-85.2 Operation .................................................................................................................................................................................O-8

5.2.1 Imaging unit life detection...............................................................................................................................................O-86. IMAGING UNIT SECTION (Drum)..............................................................................................................................O-9

6.1 Configuration.............................................................................................................................................................................O-96.2 Drive..........................................................................................................................................................................................O-96.3 Operation..................................................................................................................................................................................O-9

6.3.1 Drum drive......................................................................................................................................................................O-97. IMAGING UNIT SECTION (charge corona)..............................................................................................................O-10

7.1 Configuration...........................................................................................................................................................................O-107.2 Operation................................................................................................................................................................................O-10

8. IMAGING UNIT SECTION (developing)...................................................................................................................O-118.1 Configuration...........................................................................................................................................................................O-118.2 Drive........................................................................................................................................................................................O-118.3 Operation................................................................................................................................................................................O-11

8.3.1 Toner flow.....................................................................................................................................................................O-118.3.2 Developing Bias............................................................................................................................................................O-128.3.3 TCR Sensor Automatic Adjustment..............................................................................................................................O-12

9. TRANSFER/SEPARATION SECTION.....................................................................................................................O-139.1 Configuration...........................................................................................................................................................................O-139.2 Drive........................................................................................................................................................................................O-139.3 Operation................................................................................................................................................................................O-13

9.3.1 Transfer voltage output control.....................................................................................................................................O-139.3.2 Transfer roller cleaning control.....................................................................................................................................O-139.3.3 Paper Separation control..............................................................................................................................................O-14

10. TONER COLLECTION SECTION..........................................................................................................................O-15

vii

10.1 Configuration.........................................................................................................................................................................O-1510.2 Drive......................................................................................................................................................................................O-1510.3 Operation..............................................................................................................................................................................O-16

10.3.1 Toner collecting path...................................................................................................................................................O-1611. PAPER FEED SECTION (Tray1)............................................................................................................................O-17

11.1 Configuration.........................................................................................................................................................................O-1711.2 Drive......................................................................................................................................................................................O-1711.3 Operation..............................................................................................................................................................................O-17

11.3.1 Up/down control..........................................................................................................................................................O-1711.3.2 Paper feed control.......................................................................................................................................................O-1811.3.3 Paper size detection control........................................................................................................................................O-1811.3.4 Remaining paper level detection control.....................................................................................................................O-18

12. MULTI BYPASS SECTION (MB-503).....................................................................................................................O-2012.1 Configuration.........................................................................................................................................................................O-2012.2 Drive......................................................................................................................................................................................O-2012.3 Operation..............................................................................................................................................................................O-20

12.3.1 Up/down control..........................................................................................................................................................O-2012.3.2 Paper feed control.......................................................................................................................................................O-2112.3.3 Remaining paper level detection control.....................................................................................................................O-22

13. REGISTRATION SECTION....................................................................................................................................O-2313.1 Configuration.........................................................................................................................................................................O-2313.2 Drive......................................................................................................................................................................................O-2313.3 Operation..............................................................................................................................................................................O-23

13.3.1 Registration control.....................................................................................................................................................O-2314. FUSING SECTION.................................................................................................................................................O-25

14.1 Configuration.........................................................................................................................................................................O-2514.2 Drive......................................................................................................................................................................................O-2514.3 Operation..............................................................................................................................................................................O-25

14.3.1 Fusing speed correction..............................................................................................................................................O-2514.3.2 Fusing pressure control..............................................................................................................................................O-2514.3.3 Fusing temperature control.........................................................................................................................................O-2614