konica-minolta bizhub pro 1050,1050p theory of operation

1050ma.book Page 1 Tuesday, March 1, 2005 9:50 PM

SERVICE MANUAL

Theory of Operation

2005.03 Ver. 2.0


1050matce.fm Page i Wednesday, March 2, 2005 11:10 PM

bizhub PRO 1050/1050P Theory of Operation Ver.2.0

CONTENTS

CONTENTSSAFETY AND IMPORTANT WARNING ITEMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-1 IMPORTANT NOTICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-1 DESCRIPTION ITEMS FOR DANGER, WARNING AND CAUTION . . . . . . . . . . . . . . . S-1 SAFETY WARNINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-2 SAFETY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-11 IMPORTANT NOTICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-11 INDICATION OF WARNING ON THE MACHINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . S-12 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vRevision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v Composition of the service manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vi Notation of the service manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii II Composition/Operation I Outline

Measures to take in case of an accident . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . x I OUTLINE

1. SYSTEM CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1 2. PRODUCT SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 2.1 2.2 2.3 2.4 2.5 2.6 Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Type of paper . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Machine data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 Operating environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

3. UNIT CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 4. PAPER PATH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

II

COMPOSITION/OPERATION1.1 1.2 2.1 2.2 2.3 Timing chart when the power is on. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 Control block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 2.3.1 2.3.2 2.3.3 2.3.4 3.1 3.2 Scanner/exposure lamp control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 Original size detection control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10 AE/AES control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11 Image processing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12

1. OVERALL COMPOSITION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

2. SCANNER SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

3. WRITE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-13 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14 3.2.1 3.2.2 3.2.3 Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-14 Laser beam path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15 Write control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-15

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CONTENTS 3.2.4 4.1 4.2 4.3

bizhub PRO 1050/1050P Theory of Operation Ver.2.0 Image stabilization control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-16

4. PHOTO CONDUCTOR SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17 I Outline Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-18 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19 4.3.1 4.3.2 4.3.3 II Composition/Operation 5.1 5.2 5.3 Drum claw drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19 Cooling around the drum . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19 Image stabilization control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-20

5. CHARGING SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-21 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22 5.3.1 5.3.2 5.3.3 6.1 6.2 6.3 Charging control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22 Wire cleaning control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-22 Erase lamp control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-23

6. TRANSFER/SEPARATION SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-24 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-25 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26 6.3.1 6.3.2 6.3.3 6.3.4 6.3.5 6.4 6.4.1 7.1 7.2 7.3 Transfer guide control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26 Transfer/separation control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26 Transfer exposure lamp control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-26 Transfer assist control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-27 Wire cleaning control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-28 Transfer assist sheet by paper sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29

PCS correspondence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-29

7. DEVELOPING UNIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-30 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-31 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32 7.3.1 7.3.2 7.3.3 7.3.4 8.1 8.2 8.3 Flow of developer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-32 Developing bias . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-33 Developing suction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-34 Image stabilization control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-35

8. TONER SUPPLY SECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-36 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-37 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39 8.3.1 8.3.2 8.3.3 9.1 9.2 9.3 Toner conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-39 Toner supply control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41 Toner remaining detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-41

9. CLEANING/RECYCLE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-43 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-44 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-45 9.3.1 9.3.2 9.3.3 9.3.4 Cleaning operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-45 Toner collection mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-47 Toner conveyance operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-47 Image stabilization control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-47

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CONTENTS

10. PAPER FEED SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48 10.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-48 10.2.1 Tray lift drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-49 10.2.2 Paper feed drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-50 10.2.3 Pick-up drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-51 10.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-52 10.3.1 Up/down control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-52 10.3.2 Size detection control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-53 10.3.3 Pick-up mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-55 10.3.4 Separation mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-56 10.3.5 Air assist mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-57 10.3.6 Paper empty detection control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-58 10.3.7 Remaining paper detection control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-58 10.3.8 Tray lock control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-59 10.3.9 Dehumidification heater control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-59 10.4 PCS corresponding parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-60 10.4.1 Corresponding to additional prints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-60 11. VERTICAL CONVEYANCE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-62 11.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-62 11.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-63 11.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64 11.3.1 Pre-registration control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64 11.3.2 Conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64 11.3.3 Exit conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64 11.3.4 Paper dust removing mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-64 12. REGISTRATION SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-65 12.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-65 12.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-66 12.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-67 12.3.1 Multi feed detection control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-67 12.3.2 Loop control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-67 12.3.3 Paper mis-centering adjustment control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-68 12.3.4 Paper leading edge timing adjustment control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-68 13. HORIZONTAL CONVEYANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-69 13.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-69 13.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-69 13.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-70 13.3.1 Conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-70 14. ADU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-72 14.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-72 14.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-72 14.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-73 14.3.1 Conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-73 15. FUSING SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-74 15.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-74 15.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-75 15.2.1 Web drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-75 15.2.2 Fusing drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-75 15.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-76 II Composition/Operation I Outline 10.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-49

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CONTENTS


15.3.1 Fusing roller drive control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-76 15.3.2 Web drive control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-76 I Outline 15.3.3 Fusing temperature control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-77 15.3.4 Thick paper conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-78 15.3.5 Protection against an error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-78 16. REVERSE/EXIT SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-79 16.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-79 16.2 Drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-79 16.3 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-80 II Composition/Operation 16.3.1 Conveyance control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-80 17. INTERFACE SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-82 17.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-82 18. IMAGE STABILIZATION CONTROL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-83 18.1 Outline. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-83 18.2 Operation flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-83 18.2.1 Image stabilization control flow when the power switch (SW2) is ON . . . . . . . . . . . . . . . . . . 2-83 18.2.2 Image stabilization control flow while in the print and during idling . . . . . . . . . . . . . . . . . . . . 2-86 19. IMAGE PROCESSING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-88 19.1 Image processing in the scanner section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-88 19.1.1 Shading correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-89 19.1.2 AE control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-90 19.1.3 Area discrimination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-91 19.1.4 Brightness/density conversion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-91 19.1.5 Filter/magnification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-92 19.1.6 Scanner gamma correction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-94 19.1.7 Halftone processing (error diffusion) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-94 19.1.8 Tilt adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-94 19.1.9 Compression . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-94 19.1.10 Storage of image data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-94 19.2 Image processing in the write section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-95 20. OTHERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-96 20.1 Other fan controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-96 20.1.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-96 20.1.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-97 20.2 HDD control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-102 20.2.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-102 20.2.2 Backup. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-102 20.3 Counter control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-103 20.3.1 Composition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-103 20.3.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-103 20.4 Parts that operate when the power switch is turned ON . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-105 20.4.1 Parts that operate when the main power switch is turned ON. . . . . . . . . . . . . . . . . . . . . . . 2-105

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Introduction

IntroductionRevision historyAfter publication of this service manual, the parts and mechanism may be subject to change for improvement of their performance. Therefore, the descriptions given in this service manual may not coincide with the actual machine. When any change has been made to the descriptions in the service manual, a revised version will be issued with a revision mark added as required.

Revision mark: To indicate clearly a section revised, show A number within to the left of the revised section. represents the number of times the revision has been made.1

To indicate clearly a section revised, show A number within1

in the lower outside section of the corresponding page.

represents the number of times the revision has been made.

Note: Revision marks shown in a page are restricted only to the latest ones with the old ones deleted. When a page revised in Ver. 2.0 has been changed in Ver. 3.0: The revision marks for Ver. 3.0 only are shown with those for Ver. 2.0 deleted. When a page revised in Ver. 2.0 has not been changed in Ver. 3.0: The revision marks for Ver. 2.0 are left as they are.

2005/03 2004/10 Date

2.0 1.0 Service manual Ver. Revision mark

Revision due to the addition of a new option (SD, RC) Issue of the first edition Descriptions of revision

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Introduction


Composition of the service manualThis service manual consists of the following sections and chapters:

I. OUTLINE: System configuration, product specifications, unit configuration, and paper path II. COMPOSITION/OPERATION: Configuration of each unit, explanation of the operating system, and explanation of the control system This section gives, as information for the CE to get a full understanding of the product, a rough outline of the object and role of each function, the relationship between the electrical system and the mechanical system, and the timing of operation of each part.

I. OUTLINE: II. MAINTENANCE: System configuration, and product specifications Service schedule *, maintenance steps, list of service tools and directions for use *, firmware version up method *, and removal/reinstallation methods of major parts III. ADJUSTMENT/SETTING: IV. TROUBLESHOOTING *: Utility mode *, service mode *, security *, mechanical adjustment and POD corresponding adjustment List of jam codes, their causes, operation when a jam occurs and its release method, and list of error codes, their causes, operation when a warning is issued and estimated abnormal parts. V. APPENDIX *: Parts layout drawings, connector layout drawings, timing chart, overall layout drawing This section gives, as information required by the CE at the site (or at the customer's premise), a rough outline of the service schedule and its details, maintenance steps, the object and role of each adjustment, error codes and supplementary information.

The details of items with an asterisk "*" are described only in the service manual of the main body.

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Introduction

Notation of the service manual1. Product name In this manual, each of the products is described as follows: (1) IC board: (2) KonicaMinolta bizhub PRO 1050: (3) PS-502 PostScript3 Option: (4) Microsoft Windows 95: Microsoft Windows 98: Microsoft Windows Me: Microsoft Windows NT 4.0: Microsoft Windows 2000: Microsoft Windows XP: Standard printer Main body PS3 Option Windows 95 Windows 98 Windows Me Windows NT 4.0 or Windows NT Windows 2000 Windows XP Windows 95/98/Me Windows NT 4.0/2000 Windows NT/2000/XP Windows 95/98/Me/ NT/2000/XP

When the description is made in combination of the OS's mentioned above:

2. Brand name The company names and product names mentioned in this manual are the brand name or the registered trademark of each company.

3. Electrical parts and signals Those listed by way of example below are not exhaustive, but only some instances among many. Classification Load symbol IN PS Sensor PS Door PS1 SIG 102 PS 24V Solenoid SD DRV SOL 24V Clutch CL DRV SOL 24V CONT Motor M DRV1 DRV2 D1 D2 Drive signals of two kinds Power to drive the solenoid Drive signal Power to drive the clutch Drive signal Power to drive the motor Drive signal Sensor detection signal Ex. of signal name Description

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Introduction Classification Load symbol _U _V _W DRV1 DRV2 DRV3 D1 D2 D3 D4 DRV A DRV A DRV B DRV B A Motor M /A B /B AB BB CLK, PLL LCK, Lock, LD FR EM, Lock, LCK, LD BLK P/S S/S SS CW/CCW, F/R ENB TEMP_ER 24V Fan FM CONT, DRIVE HL EM, Lock, LCK, FEM Others Ground TH1.S, ANG SG, S.GND, S_GND PG, P.GND Ex. of signal name

bizhub PRO 1050/1050P Theory of Operation Ver.2.0 Description

Drive signals (control signals) of three kinds

Drive signals (control signals) of four kinds Motor, phases A and B control signals

PLL control signal PLL lock signal Forward/reverse rotation signal Motor lock abnormality Drive brake signal Power/stop Operating load start/stop signal Rotational direction switching signal Effective signal Motor temperature abnormality detection signal Power to drive the fan motor Drive signal Speed control signal (2 speeds) Detection signal Analog signal Signal ground Power ground

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bizhub PRO 1050/1050P Theory of Operation Ver.2.0 Classification Load symbol Ex. of signal name DCD SIN SOUT DTR Serial communication GND DSR, DSET RTS CTS RI TXD RXD Serial input Serial output Data terminal operation available Signal ground (earth) Data set ready Transmission request signal Consent transmission signal Ring indicator Serial transmission data Serial reception data Description Data carrier detection

Introduction

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Measures to take in case of an accident


Measures to take in case of an accident1. If an accident has occurred, the distributor who has been notified first must immediately take emergencymeasures to provide relief to affected persons and to prevent further damage.

2. If a report of a serious accident has been received from a customer, an on-site evaluation must be carriedout quickly and KMBT must be notified.

3. To determine the cause of the accident, conditions and materials must be recorded through direct on-sitechecks, in accordance with instructions issued by KMBT.

4. For reports and measures concerning serious accidents, follow the regulations given in "Serious AccidentReport/Follow-up Procedures."

x



SYSTEM CONFIGURATION

I OUTLINE1. SYSTEM CONFIGURATIONA. System configuration I Outline

[4]

[3]

[1]

[8]

[2]

[5]

[9] [10]

[6]

[11]

[7] [12]

1050to1001e

1

1 -1


SYSTEM CONFIGURATION [1] [2] I Outline [3] [4] [5] [6] [7] *1 *2 Main body Large capacity paper feed unit (PF-701) Double sided original auto feeder (DF-603) *1 Flat stapling finisher (FS-503) Punch and multi folding finisher (FD-501) Large capacity stacker (LS-501) Large capacity stacker (LS-502)

bizhub PRO 1050/1050P Theory of Operation Ver.2.0 [8] [9] [10] [11] [12] Toner recycle cut kit (RC-501) Expanded memory: 256 MB (EM-701) for the image controller Side cover *2 Saddle stitching trimmer finisher (SD-501) Hand cart (LC-501)

In the case of the 1050P, no scanner/DF function is provided. Attach the side cover when PF-701 is not connected. The side cover is available as the service parts.

B. Option coupling formation NOTE The option can be connected. However, be sure to take note of the AC connection mode.

Coupling combination of the main body and the finisher option 1 2 3 4 5 6 7 8 9 Main body Main body Main body Main body Main body Main body Main body Main body Main body LS-501 LS-501 LS-501 FD-501 FD-501 FS-503 LS-501 FS-503 FD-501 SD-501 SD-501 SD-501 FS-503 LS-502 FS-503

AC power to be connected to Inch External (SD-501) External (FD-501/SD-501) External (FD-501/SD-501) Inlet: (1st tandem LS-501) Inlet: (2nd tandem LS-501) Inlet: (LS-501) Inlet: (LS-501) Metric External (FD-501)

LS-502 FS-503

NOTE Any coupling formation other than the above is unavailable. PF-701 can be either connected or disconnected.

1 -2

1



PRODUCT SPECIFICATIONS

2. PRODUCT SPECIFICATIONSI Outline

2.1Type:

TypeConsole type (floor-mounted type) Indirect electrostatic method Fixed Left rear standard OPC Laser writing Two trays (1,500 sheets x 2, 20lb, 80 gsm) PF-701 (2,000 x 3, 80 gsm) *1

Copying method: Original stand: Original alignment: Photosensitive material: Sensitizing method: Paper feed trays: *1 The PF-701 is optional.

2.2

FunctionsSheet, book, solid object A3, or 11 x 17 Inch: 12 x 18, 11 x 17, 8.5 x 14, 8.5 x 11, 8.5 x 11R, 5.5 x 8.5, A3, B4, A4, B5, B5R, 8 x 13, 8.12 x 13.2, 8.25 x 13, 8.5 x 13, wide paper (up to 324 mm x 460 mm), standard index paper Metric:A3, B4, A4, A4R, B5, B5R, A5, 12 x 18, 11 x 17, 8.5 x 14, 8.5 x 11, 8 x 13, 8.12 x 13.2, 8.25 x 13, 8.5 x 13, wide paper (up to 324 mm x 460 mm), standard index paper ADU: A3, B4, A4, A4R, B5, B5R, A5, 12 x 18, 11 x 17, 8.5 x 14, 8.5 x 11, 5.5 x 8.5, 8.5 x 11R, 8 x 13, 8.125 x 13.25, 8.25 x 13, 8.5 x 13, wide paper (up to 324 mm x 460 mm)

Original: Maximum original size: Copy size: Tray /1, /2:

Magnification: Fixed magnification: Inch: x 1.000, x 2.000, x 1.545, x 1.294, x 1.214, x 0.785, x 0.772, x 0.647, x 0.500 Metric:x 1.000, x 2.000, x 1.414, x 1.224, x 1.154, x 0.866, x 0.816, x 0.707, x 0.500 Special magnification setting: Zoom magnification: Vertical magnification: Horizontal magnification: Warm-up time: First copy out time: Continuous copy speed: Continuous copy count: Copy density selection: Resolution: Scan: Write: Memory: Interface section: 600 dpi x 600 dpi 600 dpi x 600 dpi 256 MB (DRAM) + 10 GB (HDD1) RJ45 Ethernet, Serial port (RS232-C): Main body right side Serial port (USB Type B), Parallel port: Mounted on the Image processing board (IPB) 3 types x 0.250 to x 4.000 (at the step of 0.1%) x 0.250 to x 4.000 (at the step of 0.1%) x 0.250 to x 4.000 (at the step of 0.1%) Less than 6 min. (at temperature of 20C, at rated voltage) Less than 3.0 sec. 105 copies/min. (for A4/8.5 x 11) Up to 9,999 sheets AE/AES, manual (9 steps), user density (2 steps)

1 -3


PRODUCT SPECIFICATIONS No. of originals to be stored:

bizhub PRO 1050/1050P Theory of Operation Ver.2.0 More than 10,000 sheets Under the following conditions: Original: FAX#4CHART/A4 Density: Manual 5 Mode: Text/photo

I Outline

2.3

Type of paper60 g/m2 to 90 g/m2, high-quality paper OHP film, label paper, *4 coated paper, 60 g/m2 to 90 g/m2 recycled paper, 50 g/m2 to 60 g/m2, 16lb, high-quality paper (thin), 91 g/m2 to 300 g/m2, 25lb to 72lb, high-quality paper (thick) *5

Plain paper *2: Special paper *3:

*2

Standard specified paper: Inch: Metric: Hammermill Tidal MP (75 g/m2), Konica Minolta Profi (80 g/m2), HM-Cover65lb (176 g/m2), XeroxDigitalLasr65lb (176 g/m2), DomterCdor65lb, COUGARCOVER65lb (176 g/m2) Metric: RDEREY200 (200 g/m2), RDEREY160 (160 g/m2), NEUCOLORCOPY (200 g/m2), XeroxColotech (200 g/m2), Xerox3R91798 (160 g/m2) Thin paper: Label paper: Coated paper: Inch: Metric: Inch: Metric: Inch: Domter16lb (Doqupach16lb) Clair Mail (60 g/m2) AVERY 5160 AVERY DSP24 KROMEKOTE PLUSLASER HIGH GROSS 183 g/m2 (Smart Paper Company), Futural Laser 105 g/m2 (Stora Enso Paper Company) Metric:

*3

Special paper/recommended paper: Thick paper: Inch:

*4 *5

Label paper is loaded and fed one sheet at a time. 245 g/m2 to 300 g/m2 paper is available only for the middle stage tray of the PF-701.

2.4

MaintenanceOnce every 750,000 prints 40,000,000 prints or 7 years (whichever earlier)

Maintenance: Machine service life:

1 -4



PRODUCT SPECIFICATIONS

2.5

Machine dataMetric: AC230V 10%, 50Hz Less than 3600W (full option) Less than 3450W (full option) I Outline Inch: Inch: Metric: AC208V to 240V 10%, 60Hz

Power source: Power consumption: Weight: Dimensions: 1050: 1050P:

1050: Approx. 330 kg (with DF provided) / 1050P: Approx. 310 kg W 895 mm x D 775 mm x H 1190 mm W 895 mm x D 775 mm x H 1020 mm W 2902 mm x D 775 mm x H 1190 mm

1050 + PF-701 + FD-501 + FS-503:

1050P + PF-701 + LS-501 + LS-502: W 3292 mm x D 775 mm x H 1020 mm (with no operation board included in each case)

2.6

Operating environment10C to 30C (50F to 86F) 10% RH to 80% RH

Temperature: Humidity: NOTE

The information herein May be subject to change for improvement without notice.

1 -5


UNIT CONFIGURATION


3. UNIT CONFIGURATIONI Outline

[11]

[12]

[13]

[14]

[1]

[10]

[2]

[3]

[9]

[4]

[8]

[5]

[7][1] [2] [3] [4] [5] [6] [7] Operation panel Write section Developing section Registration section ADU Vertical conveyance section Paper feed section [8] [9] [10] [11] [12] [13] [14] Toner supply section Paper exit section Reverse/exit section Fusing section Scanner section Cleaning section

[6]

1050to1002c

Photo conductor section

1 -6



PAPER PATH

4. PAPER PATHI Outline1050to1003c

[6]

[7]

[1]

[5][1] [2] [3] [4] Registration conveyance Tray /2 paper feed Tray /1 paper feed ADU Paper feed

[4]

[3][5] [6] [7]

[2]Reversed paper exit Straight paper exit ADU reverse conveyance

1 -7


PAPER PATH


I Outline

Blank page

1 -8

1050ma.book Page 1 Wednesday, March 2, 2005 3:52 PM


OVERALL COMPOSITION

II COMPOSITION/OPERATION1. OVERALL COMPOSITION1.1 Timing chart when the power is on[1][2][3]Time (sec) F R Exposure lamp (L1) Fusing heater lamps /1, /2 (L2, L3) Fusing heater lamp /3 (L4) Fusing motor (M1) Charger cleaning limit sensor (PS27) Charger cleaning motor (M23) F R Charger cleaning home sensor (PS26) Transfer/separation cleaning limit sensor (PS39) Transfer/separation cleaning motor (M20) F R

[4]

[5]

[6]

[7]II Composition/Operation1050to2322c

Item Scanner motor (M27)

Transfer/separation cleaning home sensor (PS38) Drum motor (M2) Developing motor (M3) Polygon motor (M21) Laser (LDB) Paper lift motor /1 (M25) Upper limit sensor (PS6) Paper lift motor /2 (M26) Upper limit sensor /2 (PS12)

[1] [2]

Power switch (SW2) on Initial communication between the overall control board (OACB) and the printer control board (PRCB)

[5] [6]

Start of consumable stabilization control Start of image stabilization control (for the drum potential correction control, the maximum density adjustment control and the gamma correction control)

[3] [4]

Shading correction starts The thermistor /1 (TH1) and the thermistor / 3 (TH3) get to the specified temperature [7]

Warming-up completed

NOTE Various types of operations vary depending on the software DIPSW setting and the environmental settings in the service mode. The power is ON with the DF closed. The power is turned ON with the paper lift plate of the tray brought down.

2 -1


OVERALL COMPOSITION


1.2

Control block diagramCCD HDD USB I/F Parallel I/F APS

OB

DF

IPBII Composition/Operation

RS232C PCI I/F I/F

LAN I/F

OACB

Write Section

M

FM

CL

SD

PS

PRCB

SDB

ACDB

ADUDB1

ADUDB2

FD/FS/LS

PF

[6][1] [2] [3] Image bus Parallel bus

[5]

[4]

[3][4] [5] [6] UART bus Other bus

[2]

[1]

1050to2005c

Clock-synchronized serial bus

Individual signal line

2 -2



SCANNER SECTION

2. SCANNER SECTION2.1 Composition[4] [5] [6] [7] [8]

[3]Symbol [1] [2] [3] [4] [5] [6] [7] [8] Item

[2]

[1]Specification/mechanism Original stand fixed, exposure unit scan Exposure unit fixed, original scan Fan Photo sensor + stepping motor pulse control V-mirror unit Xenon lamp 75,000 lx Photo sensor + CCD sensor Lens + CCD sensor

1050to2006c

Platen mode exposure method DF mode exposure method Exposure unit cooling method (DF mode) Exposure unit home position detection method Read light reflection method Exposure light source Original size detection method Image read method

2 -3

II Composition/Operation


SCANNER SECTION


2.2

Drive[3] [4] [5]


[2][1] [2] [3] Scanner wire /Fr V-mirror unit Scanner motor (M27) [4] [5]

[1]Scanner wire /Rr Exposure unit

1050to2007c

2 -4



SCANNER SECTION

2.32.3.1

OperationScanner/exposure lamp control

A. Operations when the power is ON When the power switch (SW2) is turned ON, the exposure unit conducts the home position search and the shading correction. (1) Home position search The operation of the home position search varies depending on the ON/OFF condition of the scanner home sensor (PS51) [2]. Home position search when the scanner home sensor (PS51) is OFF. II Composition/Operation1050to2008c1050to2009c

[2]

[1]

[1]

Position at which the platen APS is read

[2]

Scanner home sensor (PS51)

Home position search when the scanner home sensor (PS51) is ON.

[2]

[1]

[1]

Position at which the platen APS is read

[2]

Scanner home sensor (PS51)

2 -5


SCANNER SECTION (2) Shading correction


After completion of the home position search [3], the exposure unit conducts shading corrections. There are three types of shading corrections: white correction 1 [4], white correction 2 [5] and black correction [6]. For the shading correction at the time of the power ON, these corrections are carried out in a series of operations.

[2]

[1] [3]


[4] [5] [6]

[7]

[8] [9] [10][1] [2] [3] [4] [5] Position at which the APS is read Scanner home sensor (PS51) Home position search terminated White correction 1 White correction 2 [6] [7] [8] [9] [10] Black correction Home position search Standby position while in the DF mode Exposure lamp (L1) ON Movement of the exposure lamp1050to2010c

2 -6


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 B. Operations when the start button is turned ON (1) When the platen is in use

SCANNER SECTION

When the start button is turned ON, the exposure unit conducts the shading correction and then the exposure scan. When the AE/AES is selected, the AE/AES scan [7] is made before the exposure scan is made. For the shading correction while in the exposure scan, the black correction is not conducted because of the exposure lamp being left turned on. While in the AE/AES copy

[2]

[1] [3] [4] [5] [6]

[7]

[9]

[8]

[10] [11][1] [2] [3] [4] [5] [6] Position at which the APS is read Scanner home sensor (PS51) DF close Start button ON White correction 1 White correction 2 [7] [8] [9] [10] [11] AE/AES scan

1050to2011c

Position at which the original is read Home position search Exposure lamp (L1) ON Movement of the exposure lamp

2 -7



SCANNER SECTION While in the manual copy


[2]

[1] [3] [4] [5]


[6]

[8]

[7]

[9] [10][1] [2] [3] [4] [5] Position at which the APS is read Scanner home sensor (PS51) DF close Start button ON White correction 1 [6] [7] [8] [9] [10] White correction 2

1050to2012c


2 -8


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 (2) When the DF is in use

SCANNER SECTION

When the start button is turned ON [3], the exposure unit conducts the shading correction and then moves to the position at which the DF is read. The same operations are made when the AE/AES is selected. And, for the shading correction in the DF mode, the black correction is not made because of the exposure lamp being left turned on.

[2]

[1]

[3] [4] [5] [6] [7]

[8] [9][1] [2] [3] [4] [5] Position at which the APS is read Scanner home sensor (PS51) Start button ON White correction 1 White correction 2 [6] [7] [8] [9]

1050to2013c


2 -9



SCANNER SECTION 2.3.2 Original size detection control


A. Detection method The DF mode and the platen mode is different in the detection method of the original size. (1) DF mode See the DF-603. (2) Platen mode In the direction of the main scan II Composition/Operation Read by the CCD sensor. In the direction of the sub-scan Detected by the combination of the ON/OFF of the APS sensor /1 (PS52) and the APS sensor /2 (PS53).

Original size Smallest B6R B5R B5 B4 A5R A5 A4R A4 A3 Wide paper 5.5 x 8.5R 5.5 x 8.5 8.5 x 14 8.5 x 11R 8.5 x 11 11 x 17 16K 8K 16KR *

CCD sensor (Length of detection: mm) 102.0 128.0 182.0 257.0 257.0 148.0 210.0 210.0 297.0 297.0 304.8 139.7 215.9 215.9 215.9 279.4 279.4 267.0 267.0 195.0

PS52 ON/OFF OFF OFF ON OFF OFF OFF ON OFF OFF OFF ON OFF OFF ON

PS53 ON/OFF OFF OFF OFF OFF ON OFF OFF OFF OFF ON ON OFF OFF ON OFF OFF ON OFF ON OFF

For "" in the table above, either of ON and OFF is acceptable as a result of the detection.

2 -10


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 B. Detection timing

SCANNER SECTION

[1]APS timing sensor (PS317) RADF open/close sensor (PS301) Exposure lamp (L1)

[2]

[1]

1st original size detection (with DF closed)

[2]

2nd original size detection

2.3.3

AE/AES control

When the AE/AES is selected, the density level of the original is detected automatically to adjust it to an appropriate density. The sampling range of the original density when the AE/AES is controlled is different for the platen mode and the DF mode. (1) AE/AES sampling range in the platen mode

[1][1] 30 mm

1050to2014c

2 -11


1050to2016c


SCANNER SECTION (2) AE/AES sampling range in the DF mode



[2] [1][1] 4 mm [2] 1 mm

1050to2015c

2.3.4

Image processing

There are following items for the image processing. For particulars, see "19. IMAGE PROCESSING." Shading correction AE/AES processing Area discrimination Brightness/density conversion Filter/magnification Density gamma (conversion) Halftone processing (error diffusion) Tilt adjustment Compression Storage of image data

2 -12



WRITE SECTION

3. WRITE SECTION3.1 Composition

[5]

[6]

[1]

[4]

[3]

[2]Symbol [1] [2] Item Laser beam scan assist Laser scan method Specification/mechanism Collimator lens + CY1 lens + f lens + CY2 lens Polygon mirror (6 faces) + motor 57874.02 rpm (line speed: 490 mm/s) 50196.85 rpm (line speed: 425 mm/s) 34251.97 rpm (line speed: 290 mm/s) [3] [4] [5] [6] Light source Positioning method Laser refraction Polygon motor cooling method 1-chip 2-beam light emitting diode Output: 15 mW per beam Index sensor + Index mirror Write mirror Fan

1050to2017c

2 -13



WRITE SECTION


3.23.2.1

OperationOutline

Analog image data read by the CCD sensor is AD converted by the CCD board (CCDB) before being sent out to the image processing board (IPB) for data processing. The image data thus processed is converted into laser beams by the laser drive board (LDB) and written onto the drum. The laser emits 2 beams with a single laser diode and writes 2 lines in one scan. The position at which the write starts is detected by the index board (INDEXB). The 2 image memory control ASIC's equipped on the image processing board (IPB) conduct the compression/ II Composition/Operation decompression processing of the image data on the main image memory (256 MB) and the sub image memory (64 MB). This is to improve the multi access and realize the thumb-nail display function. Through the control of the HDD controller on the IPB, the space of 10 GB out of the large capacity hard disk /1 (HDD1) of 40 GB is used as an image memory. This space of 10 GB serves as an extension of each of the on-board image memories to reduce the occurrence of memory overflow.

2 -14


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 3.2.2 Laser beam path

WRITE SECTION

[8]

[1]

[2] [6] [3] [4]

[5]

1050to2018c

[1] [2] [3] [4]

Polygon mirror CY1 lens Collimator Laser diode

[5] [6] [7] [8]

Drum CY2 lens Write mirror f lens

3.2.3

Write control

To prevent the mis-centering of written images, an INDEX signal detected by the index board (INDEXB) is used to decide a reference position for writing in the direction of the drum shaft (main scan direction) and control the starting position of the laser writing on the drum according to the paper edge detected by the centering sensor (PS54).

2 -15


[7]


WRITE SECTION 3.2.4 Image stabilization control


A. MPC (Maximum power control) The image processing board (IPB) indicates to the laser drive board (LDB) a maximum output value emitted by the laser to set the maximum output value. The LDB stores this set value and maintains the amount of the laser beam stored through the APC (automatic power control) operations. See "18. IMAGE STABILIZATION CONTROL." (1) Execution timing When the power switch (SW2) is turned ON. After this, the MPC value is controlled by the dot diameter II Composition/Operation adjustment control. B. APC (Auto power control) The laser drive board (LDB) monitors the laser beam output for each scanned line. When the image processing board (IPB) completes the MPC setting, the LDB controls the laser output to the MPC value for each scanned line. C. Dot diameter correction control The patch image density on the drum is detected by the sensor on the toner control sensor board (TCSB), and the laser drive board (LDB) controls the amount of the laser beam so that its output value becomes the specified value. See "18. IMAGE STABILIZATION CONTROL." (1) Execution timing while in the print When selecting "auto dot diameter adjustment" in the service mode. (2) Execution timing other than while in the print After completion of the job for each 40,000 prints on the PM counter.

2 -16



PHOTO CONDUCTOR SECTION

4. PHOTO CONDUCTOR SECTION4.1 Composition[6] [7]

[2]

[1]

[5]Symbol [1] [2] [3] [4] [5] [6] [7] Item Environment temperature detection Drum potential detection method Gradation detection Paper jam prevention method Maximum density detection Drum jam detection Drum Drum periphery cooling method

[4]

[3]1050to2019c

Specification/mechanism Drum temperature sensor (thermistor contact type) Drum potential sensor (surface electrometer) Gamma sensor (diffused light detection type) Drum claw Maximum density sensor (reflective light detection type) Jam sensor (reflective light detection type) OPC (99.7 mm) Fan + duct

2 -17





4.2

Drive

A. Drum drive

[1]


[3]

[2][1] [2] Drum Drum motor (M2) [3] Flywheel

1050to2020c

B. Drum claw drive

[1]

[2]

[3]

1050to2021c

[1] [2]

Drum claw Drum claw solenoid (SD5)

[3]

Drum motor (M2) drive input gear

2 -18




4.34.3.1

OperationDrum claw drive

A. Purpose To prevent the occurrence of a drum wrap jam, 3 drum claws are employed to prevent the drum from being wrapped with the copy paper. The contact and the release of contact of the drum claws onto the drum is made by turning ON/OFF the drum claw solenoid (SD5). B. Oscillation operation To prevent the transfer paper from getting soiled in certain areas and the drum from being damaged, the drum claws oscillate front to rear on the drum surface about 8 mm. There is a projection on the rear side of the drum claw unit. A cam provided on the gear presses this projection to push the drum claw unit to the front side. When the gear rotation releases the cam, the drum claw unit is returned to its former position by the spring. Repeating this operation oscillates the drum claws. 4.3.2 Cooling around the drum II Composition/Operation

To improve the durability of the developer, the ducts [2] are provided along the drum [4] shaft to exhaust heat around the drum.

[4]

[3]

[1]

[2][1] [2] Developing suction assembly Duct /Lw [3] [4] Suction filter Drum

1050to2022c

2 -19


PHOTO CONDUCTOR SECTION 4.3.3 Image stabilization control


A. Drum potential correction The drum potential is controlled to keep the image quality at a fixed level at all times, regardless of the operating environment and the number of prints. For the drum potential correction control, a latent patch is formed on the drum surface with the laser PWM set to maximum. Next the potential difference between the latent patch and the developing bias are measured to adjust the charging current, the grid voltage and developing bias potential so that this potential difference becomes a prescribed voltage at all times. See "18. IMAGE STABILIZATION CONTROL." II Composition/Operation (1) Execution timing When the fusing temperature is below 50C with the power switch (SW2) ON. When the prescribed conditions (number of prints, and developing theta) are met. B. Environmental decision control The temperature of the environment in which the main body is installed is detected by the drum temperature sensor (TH5), and the environmental humidity is detected by the humidity sensor mounted in the printer control board (PRCB). Data thus detected are used as information to keep the image quality at a fixed level. See "18. IMAGE STABILIZATION CONTROL." (1) Execution timing When the prescribed conditions are met with the SW2 ON. C. Drum rotation control When printing is interrupted under a high humidity environment, and under the environments of low humidity and a normal humidity, the surface sensitivity is different between the drum surface that is in contact with the developing unit and the cleaning unit and the drum surface that is in touch with nothing. When printing is made in a condition like this, uneven printing is made in the sub scan direction of the paper. To prevent this, the drum is rotated at a fixed cycle for a prescribed period of time to obtain a uniform surface sensitivity. See "18. IMAGE STABILIZATION CONTROL." (1) Execution timing Once every 3 minutes while in idling Once every hour while in the low power mode When the prescribed conditions are met with the SW2 ON

2 -20



CHARGING SECTION

5. CHARGING SECTION5.1 Composition[1]

[4]Symbol [1] [2] [3] [4] Item Charging method

[3]

[2]Specification/mechanism Scorotoron (DC minus corona discharge)

1050to2023c

Discharge wire: Tungsten 0.06 mm (gold plated skin pass) x 2 Drum neutralizing method Grid control method Wire cleaning method Erase lamp (red LED) Gold-plated stainless mesh plate Cleaning member + motor

5.2

Drive

[3]

[2][1] [2] Charger cleaning member Charging wire [3]

[1]Charger cleaning motor (M23)

1050to2024c

2 -21



CHARGING SECTION


5.35.3.1

OperationCharging control

A. Charging wire The high voltage unit /1 (HV1) uses 24V DC to create a negative charge current to the charging wire to charge the drum. Charging output range: -350 A to - 1050 A x 2 B. Charging grid II Composition/Operation To make the discharge of the charging wire uniform, a minus (-) high voltage is sent from the high voltage unit /1 (HV1) to the charging grid. Charging grid voltage output range: -400V to -1000V 5.3.2 Wire cleaning control

A. Purpose The wire is cleaned periodically to prevent the deterioration of the discharging characteristics caused by soil adhered to the charging wire. B. Timing The charging wire is cleaned under the following conditions: With the power switch (SW2) ON, when the number of prints counted from the execution of the previous cleaning is in excess of the specified number and when the fusing temperature is below 50C. While in the print, executed after completion of each job of the prescribed print counts. After completion of the automatic replacement of the cleaning blade. NOTE The number of prints at which the cleaning operation is conducted is set by the software DIPSW in the service mode.

2 -22


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 C. Cleaning operation

CHARGING SECTION

The home position of the cleaning member is provided on the rear side of the machine. It operates as shown below.

[2] [3] [4]

[1]

[5] [6]1050to2025c

[1] [2] [3]

Charger cleaning limit sensor (PS27) Charger cleaning home sensor (PS26) Cleaning (forward)

[4] [5] [6]

Cleaning (reverse) Home search (forward) Home search (reverse)

5.3.3

Erase lamp control

A. Purpose To neutralize the residual potential on the drum surface and to make the potential on the drum surface uniform, the erase lamp (EL) is turned on before charging. B. Timing for the erase lamp to be turned on

Drum motor CONT signal Erase lamp (EL)

[1][1] Drum motor ON

1050to2026c

2 -23



TRANSFER/SEPARATION SECTION


6. TRANSFER/SEPARATION SECTION6.1 Composition[5] [6]


[3]

[4]

[2]Symbol [1] [2] [3] [4] [5] [6] Item Separation method Separation wire cleaning method Transfer assist method Transfer guide plate dirt prevention method Transfer method Transfer wire cleaning method

[1]

1050to2027c

Specification/mechanism AC/DC corona discharge Discharge wire: Oxide film tungsten 0.06 mm x 2 Cleaning member + motor Transfer assist sheet + motor High voltage impression DC positive (+) corona discharge Discharge wire: Oxide film tungsten 0.06 mm x 1 Cleaning member + motor

2 -24




6.2

Drive

A. Transfer/separation cleaning drive

[3]

[2]

[1]1050to2028c

[1] [2]

Transfer/separation cleaning motor (M20) Transfer wire/separation wire

[3]

Transfer cleaning member/separation cleaning member

B. Transfer assist sheet drive

[2]

[1][1] Transfer assist motor (M19) [2] Transfer assist sheet assembly

1050to2029c

2 -25





6.36.3.1

OperationTransfer guide control

A. Purpose To prevent the transfer guide plate from getting soiled, a minus (-) DC voltage is sent from the high voltage unit / 2 (HV2). Voltage: -500V B. Timing II Composition/Operation The voltage sent to the transfer guide plate is made in sync with the ON/OFF of the drum motor (M2). 6.3.2 Transfer/separation control

A. Transfer The high voltage unit /2 (HV2) uses 24V DC to generate a plus (+) DC current to the transfer wire to discharge electricity. Transfer DC output range: 60 A to 800 A B. Separation For separation, an AC current and a minus DC current are used. The high voltage unit /2 (HV2) sends these currents to the separation wire to discharge electricity. Separation AC output range: 500 A to 1400 A Separation DC output range: 0 A to - 300 A 6.3.3 Transfer exposure lamp control

A. Purpose The transfer exposure lamp (TSL) is turned on to enhance the transferability and prevent the reverse charge to the drum. B. Timing The transfer exposure lamp (TSL) turns ON a specified period of time after the paper leading edge sensor (PS41) turns ON, and it turns OFF a specified period of time after the registration sensor (PS40) turns OFF. C. Lighting control The TSL switches the light intensity according to the process speed and the paper weight. However, when paper weight more than 162 g/m2 is selected, the TSL does not turn on.

2 -26


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 6.3.4 Transfer assist control


A. Purpose To enhance the transferability on the entire rear side of paper, the transfer assist sheet presses up the entire rear side of paper to get it in contact securely with the drum while in the transfer on the rear side. However, the size of paper to be operated must be larger than 297 mm (A3/A4) in the main scan direction (default for metric area), and larger than 279 mm (11 inches) (default for inch area). B. Timing The paper pressing operation of the transfer assist sheet is controlled so that the pressing operation is only made when paper is provided to prevent the transfer assist sheet from getting contact with the drum. The ON/ OFF timing of the pressing operation varies according to each of the line speeds. (1) ON timing The transfer assist sheet turns ON at a specified distance after the leading edge of paper passes through the transfer guide. This ON timing is based on the point at which the paper leading edge sensor (PS41) turns ON. (2) OFF timing The transfer assist sheet turns OFF short of a specified distance before the trailing edge of paper passes through the transfer guide. This OFF timing is based on the point at which the paper leading edge sensor (PS41) (PS41) turns OFF. (3) Others When paper is found mis-centered more than 5 mm by the centering sensor (PS54), no pressure operation is made (to prevent the drum from being damaged). The pressing operation is made only when the copy is being made on the second side of the paper. However, the weight of paper is in excess of 91 g/m2, the pressing operation is not made even while in the copy on the second side of the paper. The paper width to which the transfer assist sheet is applicable is limited. When printing paper the width of which is shorter than a set width, the pressing operation is not made because of the drum getting damaged. The pressing operation of the transfer assist sheet can be disabled by the software DIPSW. (DIPSW 6-2) For paper sizes other than default, see "4.5 PCS corresponding parts," in Field Service, Chapter II. II Composition/Operation

2 -27


TRANSFER/SEPARATION SECTION 6.3.5 Wire cleaning control


A. Purpose To prevent the deterioration of the discharge characteristics caused by toner adhering to the transfer wire and the separation wire, the wire is cleaned periodically. B. Timing The cleaning is made when the number of prints counted from the execution of the previous cleaning is in excess of the specified number with the power switch (SW2) ON, and when the fusing temperature is below 50C. II Composition/Operation While in the print, executed after completion of each job of the prescribed print counts. NOTE The number of prints at which the cleaning operation is conducted is set by the software DIPSW in the service mode. C. Cleaning operation The home position of the cleaning member is provided on the front of the machine. It operates as shown below.

[1] [3] [4]

[2]

[5] [6]1050to2324c

[1] [2] [3]

Transfer/separation limit sensor (PS39) Transfer/separation home sensor (PS38) Cleaning (going)

[4] [5] [6]

Cleaning (returning) Home search (going) Home search (returning)

2 -28




6.46.4.1

PCS correspondenceTransfer assist sheet by paper sizes

A. Purpose For the transfer assist sheet, the sizes of paper that can be used is limited. It does not function when a paper size is not appropriate. However, it is possible to use paper other than the standard size by replacing the transfer/separation charger unit in accordance with the user specifications. B. Usage Other than the standard size of the transfer assist sheet, the following sizes are available. However, when changing to any other size than the standard, it is required to add a new relay wiring harness and a size detection connector. It is possible to use different transfer assist sheets. On that occasion, in addition to the relay wiring harness mentioned above, it is necessary to purchase a transfer assist sheet that is built in to the transfer/separation charger unit. Unit Type Wire color of the size detection connector Transfer/separation charger unit Used exclusively for A3, A4 Used exclusively for 11 in. Used exclusively for 8K, 16K Used exclusively for B4, B5 Used exclusively for 8.5 in. Used exclusively for A4R, A5 Used exclusively for 8, 8.125, 8.25 in. B5R Transfer assist sheet assembly Used exclusively for A3, A4 Used exclusively for 11 in. Used exclusively for 8K, 16K Used exclusively for B4, B5 Used exclusively for 8.5 in. Used exclusively for A4R, A5 Used exclusively for 8, 8.125, 8.25 in. Used exclusively for B5R Brown Red Orange Yellow Pink Blue Purple Gray Default size for metric area Default size for inch area Default size for metric area Default size for inch area Remarks II Composition/Operation

NOTE When different sizes are used, the size detection connector is required for the transfer/separation charger unit. The unit must be changed by the user himself, and it is necessary to give appropriate guidance and explanation to the intended user.

2 -29


DEVELOPING UNIT


7. DEVELOPING UNIT7.1 Composition


[4]Symbol [1] [2] [3] [4] method Item

[3]

[2]

[1]Specification/mechanism

1050to2400c

Developer agitation/conveyance Developer agitation/conveyance method Developing roller spiking restriction method Developing method

Agitator screw (2) + agitator plate (1) Agitator plate (with 6 blades) Developer regulation blade 2 components developing method (Developer: toner + carrier) Developing roller (2 components reverse magnetic brush) Developing bias impressed: - 300V to - 800V

2 -30



DEVELOPING UNIT

7.2

Drive[5]

[1] [6]

[4]

[3][1] [2] [3] Gear for the agitator screw Belt Gear for the agitator plate [4] [5] [6]

[2]Gear for the developing roller Developing motor (M3) Coupling for the developing drive

1050to2401c

2 -31



DEVELOPING UNIT


7.37.3.1

OperationFlow of developer

Developer in the developing unit is supplied to the developing roller [3] by the agitator plates [2] and its level is kept at a fixed height by the developer regulation blade [5]. Developer that remains on the developing roller is returned to the agitator screws [1]. There are 2 agitator screws equipped. The agitator plate furthest from the developing roller is used to stabilize the charging characteristics of toner supplied to the developing unit.


[4]

[5]

[3][1] [2] [3] Agitator screw Agitator plate Developing roller

[2][4] [5] Drum

[1]

[2]

1050to2402c

Developer regulation blade

2 -32


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 7.3.2 Developing bias

DEVELOPING UNIT

A. Purpose During developing, a developing bias voltage is sent to the developing sleeve so that toner is ready to adhere to the drum.

[2]

[1]1050to2319c

[1]

Developing bias pin

[2]

Developing bias shaft

B. Timing To prevent unnecessary carriers from adhering to the drum, developing bias turns ON a specified period of time before charging is ON, and it turns OFF a specified period of time after charging is OFF.

2 -33



DEVELOPING UNIT 7.3.3 Developing suction


A. Purpose The developing suction fan (FM5) [1] is provided to suction toner being scattered around the developing unit and the drum and recover it to the suction filter [4] in the developing suction assembly [2]. B. Flow of air

[3]II Composition/Operation

[4]

[2]

[1]1050to2403c

[1] [2]

Developing suction fan (FM5) Developing suction assembly

[3] [4]

Duct Suction filter

C. Developing suction fan control While in the warm up and the print, the developing suction fan (FM5) turns ON when the drum motor (M2) turns ON, and it turns OFF a specified period of time after the M2 turns OFF.

2 -34


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 7.3.4 Image stabilization control

DEVELOPING UNIT

A. Toner density control The toner density control detects the patch density in images written and developed under fixed conditions and adjusts either the speed of rotation of the developing roller or the toner supply time depending on the findings obtained by comparing it to the reference value. For particulars, see "18. IMAGE STABILIZATION CONTROL." (1) Execution timing Once every specified number of prints after the power switch (SW2) is turned ON. B. Maximum density correction control The maximum density correction control is a control in which the patch, in images written under a fixed condition is developed while changing the speed of rotation of the developing roller. The resulting developed patch densities are compared to a reference density and when the developed patches are the same density as the reference patch, the developer roll speed is memorized. For particular, see 18. IMAGE STABILIZATION CONTROL. (1) Execution timing When the fusing temperature is below 50C with the SW2 ON. When the prescribed conditions (number of prints, and developing theta) are met. C. Gamma correction control The gamma correction control detects the patch density in images written and developed under a fixed condition, and adjusts the amount of laser beam PWM while writing depending on the findings obtained by comparing the patches with the reference value. For particular, see "18. IMAGE STABILIZATION CONTROL." (1) Execution timing When the fusing temperature is below 50C with SW2 ON. When the prescribed conditions (number of prints, and developing theta) are met. II Composition/Operation

2 -35


TONER SUPPLY SECTION


8. TONER SUPPLY SECTION8.1 Composition


[5]

[6] [3] [4]

[2] [1]

1050to2035c

Symbol [1]

Item Toner replenishment method Toner bottle

Specification/mechanism Toner capacity: 1600 g Bottle size: 155 mm x 427 mm

[2] [3] [4] [5] [6]

Toner intermediate supply method Toner conveyance method Toner/air separation method Toner/air mixing method Toner supply method

Intermediate hopper Toner remaining sensor Twin air conveyance (toner pump motor + air pump motor) Separation by means of toner own weight + air bleed Mixing in the cup section Toner remaining sensor (used to detect an error) Large capacity hopper Toner capacity: 1700 g Toner remaining sensor x 2

2 -36




8.2

Drive

A. Toner bottle/large capacity hopper drive

[6]II Composition/Operation1050to2325e

[1]

[5]

[4]

[2]

[3]

[1] [2] [3]

Toner bottle motor (M16) Gear for the large capacity hopper agitator shaft Mixing section agitator shaft gear

[4] [5] [6]

Toner hopper motor (M7) Gear for the toner bottle rotation shaft Toner bottle

2 -37


TONER SUPPLY SECTION B. Intermediate hopper/air separation drive



[5] [1]

[4]

[3]

[2]

[2]1050to2326c

[1] [2] [3]

Air separation motor (M10) Gear for the intermediate hopper section agitator shaft Intermediate hopper motor (M11)

[4] [5]

Gear for the rotary valve Gear for the air separation section agitator shaft

2 -38




8.38.3.1

OperationToner conveyance control

A. Purpose The toner supply section of the intermediate and low speed machines is equipped near the developing unit. For the high speed machine that deals with a large number of prints, a toner supply section of a large capacity is required and it is not possible to secure a sufficient space near the developing unit. So, it is inevitable to place the toner supply section in a location away from the developing unit. As a result, because of the distance up to the toner supply section having to be extended, an toner conveyance mechanism to deal with the long distance is required. As a toner conveyance device for the long distance, this machine employs the air conveyance method using the toner pump and the air pump. B. Toner conveyance path II Composition/Operation

1. 2. 3. 4. 5. 6.

Toner put in from the bottle [1] is conveyed to the large capacity hopper [2] by the agitator operation. When the toner supply operation starts, toner is guided to the mixing section [3], where it is mixed with air from the air pump [5]. Toner mixed with air is conveyed to the air separation section [6] by the pressure from the toner pump [4]. Toner conveyed to the air separation section drops off by its own weight to be separated from the air. Toner separated from the air at the air separation section is conveyed to the intermediate hopper [7] by means of the agitator operation. When the toner supply operation starts, toner in the intermediate hopper is conveyed to the developing unit [8] by means of the agitator operation.

7. Finally, air passing through the air separation section is sent to the mixing section by the air pump. In this manner, a toner conveyance path is formed that circulates between the large capacity hopper and the developing unit.

[6]

[5]

[4] [1]

[7] [3] [8]

[2]

1050to2038c

[1] [2] [3] [4]

Toner bottle Large capacity hopper Mixing section Toner pump

[5] [6] [7] [8]

Air pump Air separation section Intermediate hopper Developing unit

2 -39


TONER SUPPLY SECTION C. Pump control (1) Configuration


In both the toner pump and the air pump, the diaphragm [2] is reciprocated by the toner pump motor (M28) or the air pump motor (M29) to circulate air in the pump room [3]. In this manner, air in the pump room is pressurized to be output.


[7] [6]

[1]

[2]

[3]

[5]

[4]

1050to2039c

[1] [2] [3] [4]

Motor Diaphragm Pump room Output air

[5] [6] [7]

Input air Pump encoder sensor Encoder

(2) Control Each pump motor is equipped with the pump encoder sensor to monitor the speed of the motor. When the pump motor is turned ON, if the speed of the motor fails to get to 85% of the prescribed speed within a specified period of time, this is deemed to be an error. While in operation, if a low speed rotation below a prescribed value is detected a specified number of times in succession, this is deemed to be an error.

2 -40


bizhub PRO 1050/1050P Theory of Operation Ver.2.0 8.3.2 Toner supply control


A. Purpose When it is determined that toner supply is required as a result of the toner density control, toner is supplied. The intermediate hopper receives recycled toner from the cleaning section and a new toner from the air separation section. The intermediate hopper mixes these and supplies them to the developing unit. B. Timing Toner is supplied when the trailing edge of paper in printing is detected. The toner supply time varies depending on the result of the toner density control and the paper size. This is normally controlled between 0 to 0.55 sec. 8.3.3 Toner remaining detection II Composition/Operation

A. Toner remaining detection The intermediate hopper section is equipped with the toner remaining sensor /1 (PS31) [1] and the large capacity hopper [4] equipped with the toner remaining sensors /2 (PS32) [2], /3 (PS33) [3] and /4 (PS34) [5]. Depending on the ON/OFF condition of the PS31, the PS32 and the PS33, the toner level is displayed on the operation panel. (1) Sensor position

[6]

[5]

[2] [4] [3][4] [5] [6]

[1]

1050to2040c

[1] [2] [3]

Toner remaining sensor /1 (PS31) Toner remaining sensor /2 (PS32) Toner remaining sensor /3 (PS33)

Large capacity hopper Toner remaining sensor /4 (PS34) Mixing section

2 -41


TONER SUPPLY SECTION (2) Toner remaining display Display on the operation board



PS31 PS32 PS33

ON ON ON

ON OFF ON

ON OFF OFF

OFF OFF OFF1050to2041c

*1

However, the determination is finally made a specified period of time after the toner supply door is closed.

(3) Error detection When SC23-14 or SC-23-17 of the error codes that are related to the toner supply occurs, the machine gets into an error latch condition. Be sure to repair the defective part before setting the software DIPSW3-1 to 0. Setting the DIPSW3-1 to 0 without repairing the defective part may cause toner to overflow in the inside and the outside of the machine. B. Detection timing (1) Timing The detection timing is as described below: When the power switch (SW2) is turned ON. When the front doors /Ft and /Rt, and the toner supply door are opened and closed. At all times when the printing. (2) Toner bottle When the toner bottle is rotated, toner moves to the exit of the bottle [1] along the spiral groove carved on the surface of the bottle. When the bottle exit turns to the bottom, toner flows into the large capacity hopper [2].

[1]

C

B

A

[3]

C

B A

[2]1050to2042c

[1] [2]

Exit Into the large capacity hopper

[3]

Rotated to 90

2 -42



CLEANING/RECYCLE SECTION

9. CLEANING/RECYCLE SECTION9.1 Composition[1]

[4]Symbol [1] [2] [3] [4] Item Drum cleaning method Toner collection method with a brush Toner collection method Toner recycle method

[3]

[2]

1050to2043c

Specification/mechanism Counter method + cleaning blade (2 pcs., replaced automatically) + weight plate Toner guide brush Screw Screw

2 -43





9.2

Drive

A. Cleaning/recycle drive


[4]

[3][1] [2] Gear for the toner guide brush Drum motor (M2)

[2][3] [4] Gear for the toner recycle screw

1050to2044c

Gear for the toner conveyance screw

B. Cleaning blade drive

[4]

[1]

[2] [3][1] [2] Wire Pulley for the cleaning blade [3] [4] Blade release arm Blade motor (M22)1050to2045c

2 -44




9.39.3.1

OperationCleaning operation

A. Assist mechanism Toner scraped off by the cleaning blade [2] is collected by the toner guide brush [4] and guided to the toner conveyance screw [5]. At this time, toner remaining on the toner guide shaft [7] is scraped off by the toner collection scraper [6].

[2] [7]

[6] [5][1] [2] [3] [4] Cleaning blade /1 Cleaning blade /2 Drum Toner guide brush

[4][5] [6] [7]

[3]Toner conveyance screw Toner collection scraper Toner guide shaft

1050to2046c

2 -45


[1]


CLEANING/RECYCLE SECTION B. Automatic replacement of the blade


The cleaning section is equipped with 2 cleaning blades. The 2nd cleaning blade pushes up the blade release arm [3] as the blade motor (M22) [1] rotates. At this time, the wire wound around the cleaning blade shaft is taken up to rotate the cleaning blade shaft and change the cleaning blades /1 and /2. Automatically changing these 2 cleaning blades lengthens the maintenance cycle.


[1]

[3]

[2]

1050to2047c

[1] [2]

Blade motor (M22) Blade sensor /1 (PS24)

[3] [4]

Blade release arm Blade sensor /2 (PS25)

C. Blade pressure release operation To enhance the increased durability of the drum and the cleaning blade, the cleaning blade conducts the pressure release operation to the drum by the blade motor (M22). The M22 operates in accord with the ON/OFF of the drum motor (M2). The pressure release and the replacement position of the cleaning blade are controlled by the blade sensor /1 (PS24) and the blade sensor /2 (PS25). D. Blade set mode As an operation conducted after replacing the cleaning blade for the maintenance purpose, there is the blade se

konica-minolta bizhub pro 1050,1050p theory of operation

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