yamaha psr-240 service manual

8/16/2019 Yamaha Psr-240 Service Manual

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CONTENTS

SPECIFICATIONS ...................................................................................... 3

PANEL LAYOUT ....................................................................................... 4

CIRCUIT BOARD LAYOUT ....................................................................... 5

BLOCK DIAGRAM .................................................................................... 6

DISASSEMBLY PROCEDURE ................................................................. 7

LSI PIN DESCRIPTION .......................................................................... 10CIRCUIT BOARDS .................................................................................. 11

TEST PROGRAM & INITIALIZE ...............................................................15

MIDI IMPLEMENTATION CHART............................................................ 17

PARTS LIST

OVERALL CIRCUIT DIAGRAM

SERVICE MANUAL

http://psr-240_248block.pdf/

http://psr-240_248cb-1.pdf/

http://psr-240_248pl.pdf/

http://psr-240_248oa.pdf/

http://psr-240_248oa.pdf/

http://psr-240_248pl.pdf/

http://psr-240_248cb-1.pdf/

http://psr-240_248block.pdf/



IMPORTANT NOTICE

This manual has been provided for the use of authorized Yamaha Retailers and their service personnel. It has been

assumed that basic service procedures inherent to the industry, and more specifically Yamaha Products, are alreadyknown and understood by the users, and have therefore not been restated.

WARNING: Failure to follow appropriate service and safety procedures when servicing this product may result

in personal injury, destruction of expensive components and failure of the product to per form as

specified. For these reasons, we advise all Yamaha product owners that all service required should

be performed by an authorized Yamaha Retailer or the appointed service repre sentative.

IMPORTANT: This presentation or sale of this manual to any individual or firm does not constitute authorization,

certification, recognition of any applicable technical capabilities, or establish a principal-agent rela-

tionship of any form.

The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The research engineer-ing, and service departments of Yamaha are continually striving to improve Yamaha products. Modifications are, therefor,inevitable and changes in specification are subject to change without notice or obligation to retrofit. Should any discrep-ancy appear to exist, please contact the distributor's Service Division.

WARNING: Static discharges can destroy expensive components. Discharge any static electricity your body

may have accumulated by grounding yourself to the ground buss in the unit (heavy gauge black

wires connect to this buss).

IMPORTANT: Turn the unit OFF during disassembly and parts replacement. Recheck all work before you applypower to the unit.

WARNING: CHEMICAL CONTENT NOTICE!

The solder used in the production of this product contains LEAD. In addition, other electrical / electronic and / or plastic

(where applicable) components may also contain traces of chemicals found by the California Health and Welfare Agency

(and possibly other entities) to cause cancer and / or birth defects or other reproductive harm.

DO NOT PLACE SOLDER, ELECTRICAL / ELECTRONIC OR PLASTIC COMPONENTS IN YOUR MOUTH FOR ANY

REASON WHAT SO EVER!

Avoid prolonged, unprotected contact between solder and your skin! When soldering, do not inhale solder fumes or

expose eyes to solder / flux vapor!

If you come in contact with solder or components located inside the enclosure of this product, wash your hands before

handling food.

PSR-240/248

WARNINGComponents having special characteristics are marked and must be replaced with parts having specification equal to thoseoriginally installed



PSR-240/248

Keyboards

61 standard-size keys (C1 - C6) with touch responce

Voices100 panel voices (max. polyphony: 16)

EffectsDual (Included in Voice)

Harmony/Echo (Included in Voice)Split (Included in Voice)

Auto Accompaniment

100 stylesFingering : Multi FingeringSections : Intro, Main A/B, Ending, Fill x 4

Overall controls

Tempo

Multi Pad

Transpose

Tuning

Accompaniment VolumeSong Volume

Metronome Volume

Style controls

Acmp On/Off, Sync-Start, Start/Stop, Intro/Ending,

Main A/B (Auto Fill)

OTS

Chord Guide

Song controls

Start/Stop, Pause, A«B Repeat, Fast/Forward,

Rewind

Voice ChangeMelody Guide

Portable Grand

Metronome

Panel controls

Overall (st, +, -), SONG, VOICE, STYLE, DEMO,TOUCH, Numeric keypad (0 - 9, +, -)

One Touch Setting

1/style

Display

Large multi-function LCD (backlit)

Amplifier2.0W + 2.0W

MIDIIN/OUT

Auxiliary jacksPHONES/OUTPUT, DC IN 10-12V, MIDI IN/OUT,

SUSTAIN

Speakers12cm x 2

Power consumption

8.7W (when using PA-3B power adaptor)

Power supply

Adaptor : Yamaha PA-3B AC power adaptor

Batteries : Six “D” size, SUM-1, R-20 orequivalent batteries

Dimensions

933 x 370 x 129 mm(36-3/4" x 14-7/12" x 5-1/12")

Weight

5.7kg (12 Ibs., 9 oz.)

Supplied accessoriesMusic StandOwner’s Manual

Song Book

Optional accessoriesHeadphones : HPE-150

AC power adaptor : PA-3B

Footswitch : FC4, FC5Keyboard stand : L-2L, L-2C

* Specifications and descriptions are for information purposes

l Y m h C th i ht t h m dif



PSR-240/248

(1) Power Switch (STAND BY/ON)

(2) MASTER VOLUME dial

(3) FUNCTION button

(4) SONG button

(5) STYLE button

(6) VOICE button

(7) Numeric keypad,+/- buttons

(8) ACMP ON/OFF button

(9) SYNC-START button

Rear Panel

Control Panel

(10) START/STOP button

(11) INTRO/ENDING button

(12) MAIN A/B buttons

(13) OTS button

(14) CHORD GUIDE button

(15) PAUSE button

(16) START/STOP button

(17) A«B Repeat button

(18) Fast Forward/Rewind buttons

(19) VOICE CHANGE button

(20) MELODY GUIDE button

(21) PORTABLE GRAND button

(22) METRONOME button

(23) MULTIPUD X20BANKS buttons

(24) DEMO button

(25) TOUCH button



2NC-

‡@ PN-CN1 M1/2-CN2 LCD 9P/L170 PN-W002

‡A PN-CN2 M1/2-CN3 PN 12P/L180 PN-W003‡B PN-CN3 PN-CN4 PN-SW 8P/L145 PN-W001

‡C M2/2-CN12 M1/2-CN1 M2/2 6P/L350 M2/2-W001

‡D M1/2-CN5 MKC-CN2 MK1 11P/L160 390

‡E M1/2-CN8 SPEAKER(L) SP-L 2P/L230 400

‡F M1/2-CN7 SPEAKER(R) SP-R 2P/L680 410

‡G M1/2-CN9 INV-CN906 EL-IN 2P/L580 420

‡H INV-CN905 EL LIGHT EL-OUT 2P/L360 430

‡I M1/2-CN11 BATTERY BATT 2P/L330,720 440

‡J M1/2-CN4 MKC-CN1 MK2 13P/L240 450‡K VR/SW2/2-CN50 M1/2-CN10 PSW 4P/L90 PSW-W02

‡L VR/SW1/2-CN40 M1/2-CN6 VR 5P/L100 VR-W01

‡M MKC-CN2 MK-L 160d 12P/200 160d

‡N MK-H MK-L MK-B 12P/220 160e

‡O MKC-CN3 MK-L MK-C 7P/260 160f

‡P MKC-CN4 MK-H MK-D 5P/L625 160g

REF.NO. DESTINATIONCONNECTOR

REMARKSPARTS LIST

ASSEMBLY Ref.NO REF.NO. DESTINATIONCONNECTOR

REMARKSPARTS LIST

ASSEMBLY Ref.NO



PSR-240/248

6

28CA1-8813449 0



PSR-240/248

1 Lower Case Assembly

1-1 Remove the battery cover assembly.(Fig.1)

(Fig.1)

[270]: Bind Head Tapping Screw-P 3.0X12 MFZN2Y (EP600300)[280]: Bind Head Tapping Screw-P 3.0X25 MFZN2Y (VK228100)

2. M 1/2 Circuit Board

2-1 Remove the lower case assembly. (See Procecure 1.)

2-2 Remove the ten (10) screws marked [260A]. The M 1/

2 circuit board can then be removed. (Fig.2)

3. INV Circuit Board

3-1 Remove the lower case assembly. (See Procesure 1.)

3-2 Remove the two (2) screws marked [260B]. The INV

circuit board can then be removed. (Fig.2)

4. M 2/2 (MIDI) Circuit Board

4-1 Remove the lower case assembly. (See procedure 1.)

4-2 Remove the two (2) screws marked [260C].

The M 2/2 (MIDI) circuit board can then be

removed.(Fig.2)

5. Keyboard Assembly

5-1 Remove the lower case assembly. (See Procedure 1.)

5-2 Remove the three (3) screws marked [280]. The

keyboard assembly can then be removed. (Fig.2)

1-2 Remove the fifteen (15) screws marked [270] and the

two (2) screws marked [280]. The lower case assem-bly can then be removed. (Fig.1)



PSR-240/248

6. VR/SW 1/2 Circuit Board

6-1 Remove the MASTER VOLUME knob marked

[240] on the control panel. (Fig.3)

6-2 Remove the lower case assembly. (See Procedure 1.)6-3 Remove the three (3) screws marked [260A]. The VR/SW 1/

2 circuit board with the knob can then be removed. (Fig.4)

7. VR/SW 2/2 Circuit Board


7-2 Remove the two (2) Screws marked [260B]. The VR/

SW 2/2 circuit board with the knob can then beremoved. (Fig.4)

7-3 Remove the knob from the VR/SW 2/2 circuit board.

8. PN 1/2 Circuit Board


8-2 Remove the M 1/2 circuit board. (See Procedure 2.)

8-3 Remove the fitteen (15) screws marked [260C]. ThePN 1/2 circuit board can then be removed. (Fig.4)

9. PN 2/2 Circuit Board



9-3 Remove the nine (9) screws marked [260D]. The

PN 2/2 circuit board can then be removed. (Fig.4)

10. LCD



10-3 Remove the PN 1/2 circuit board. (See Procedure 8.)

10-4 Remove the EL light.

*When replacing the EL light, solder the wires to the

EL light leads within 3 seconds a wire, keeping the

leads more than 3 mm.

*Do not bend the EL light.10-5 Remove the two rubber contacts. Be careful not to

touch the conductive surface. The LCD can then be

removed. (Fig.5)

[260]: Bind Head Tapping Screw-P 3.0X8 MFZN2Y (EP600280)(Fig.4)

(Fig.3)



(Fig.6)

(Fig.7)

13 Assembling the keyboard assembly

13-1 Install the white keys CEGB from the lower register, and

then DFA keys and C’ key. Afterwards install the black keys

from the higher register, and tighten the twenty-one (21)

screws marked [140]. (Fig.9)

11. Speakers

11-1 Remove the lower case assembly. (See Procedure 1.) 11-2 Remove the eight (8) screws marked [290]. The right and

left speakers can then be removed. (Fig.6)

12. Disassembling the keyboard assembly

12-1 Remove the keyboard assembly. (See Procedure 5.)

12-2 Remove the two (2) Screws marked [30]. The MKC circuit

board can then be removed. (Fig.7)

12-3 Remove the MK circuit board while pressing the fifteen(15) hooks (A) inward, and then remove the rubber

contact. (Fig.8.)

12-4 Remove the twenty-one (21) screws marked [140], then

remove the black keys from the lower register. Afterward,

remove the while keys DFA and C’ and then remove the

white keys DFA and C’ and then remove the white keysCEGB from the higher register. At this time, lift the keys

from the front and slide them towards you. The keys can

then be removed from the assembly. (Fig.9)

13-2 Install the rubber contacts in the assembly while

the keys as shown in Fig.10. Check that the rubb

contact has been firmly placed into position in the

indicated by the arrow in Fig, 11. (Fig.10,11 and 1

*When fitting the rubber contacts, raise both endsframe so that keys do not push the rubber contac

Install the MK circuit board in the assembly so tha

hooks (B) hold it as shown in Fig.11.

[290]: Bind Head Tapping Screw-P 4.0X8 MFZN2BL (VB931600)

[30]: Bind Head Tapping Screw-P 3.0X8 MFZN2Y (EP600280)

[280]: Bind Head Tapping Screw-P 3.0X25 MFZN2Y (VK228100)

(Fig.12)

(Fig.11)

(Fig.10)

(Fig.8)

(Fig.9)

[140]: Bind Head Tapping Screw-P 3.0X16 MFZN2BL (VB205200)

[140]: Bind Head Tapping Screw-P 3.0X16 MFZN2B (VS756700)

[140]: Bind Head Tapping Screw-P 3.0X16 MFZN2B (EP600310)



M 1/2 Circuit Board

Component side

M:2NA-V34

to M 2/2 (MIDI)

to SPEAKERS(L)to SPEAKERS(R)

to MKC-CN2

to PN 1/2-CN1 to VR/SW

to VR/SW

to BATTERY

to PN 1/2-CN2

to INV-CN906

to MKC-CN1



Pattern side

PN 1/2 Circuit Board

to M-CN2 to M-CN3 to PN 2/2 CN4 Component side

PN:2NA-V34



PSR-240/248

TESTNO.

LCD (initial) Test Functions and Judgment Criteria

1 001:Version Display ROM version

ROM (Program, Wave) versions are displayed alternately on the LCD.2 002:Rom Chk1 Checks the ROM

The test result appears on the LCD.

3 003:Ram Chk1 Checks all the RAMs which are connected to the CPU.


11 011:TG1 Chk Outputs the sine wave by changing the channels in sequence from C2 to D#3.

After auto-scaling is finished, individual keys can be played. (If playing two or more

keys simultaneously, the first pressed key has priority to make a sound.)

13 013:Pit Chk Connect the frequency counter to the [PHONES/AUX OUT] jack.

Check that the 440 Hz +1.76 Hz signal is output.

14 014:Output R Connect the level meter (with a JIS-C filter) to the [PHO NES/AUX OUT] jack. (33 ohm load)

Set the [MASTER VOLUME] at maximum.

Check the output level (1 kHz).

Phones L: Less than –59.4 dBm

Phones R: -21.4 dBm +/- 2 dB

15 015 O t t L C t th l l t ( ith JIS C filt ) t th [PHONE S/AUX OUT] j k (33 h l d)

1. TEST PROGRAM

A. PREPARATION

1) PA-3B (AC adaptor ) is used.(PA-32,PA-3 are utilizable)

2) The volume is usually moved to the use position when no volume change is required.

3) Measuring instruments:

Frequency counter

Level meter (with a JIS-C filter)

Note: Use a stereo plug and connect the 33 ohm load to the [PHONES/AUX OUT] jack.

4) Jigs:

Foot switch, MIDI cable

B. HOW TO ENTER THE TEST PROGRAM

While pressing the C2#, F2 and G2# keys, turn on the [STAND BY/ON] switch.

C. PROCEEDING THROUGH THE TEST PROGRAM

The LCD will display “TEST” when entering the test program.

To select the program number, use the [OVERALL +/-] button.To execute the test, press the [STAND/STOP] button.

To proceed to the next test, press the [START/STOP] button.

D. TEST PROGRAM LIST



PSR-240/248

28 028:LCD On Check that all LCD dots are on.

29 029:LCD Off Check that all LCD dots are off. The LCD becomes white.

31 031:PD1 Chk Connect the foot switch to the [FOOT SWICH] jack.

Check that the C3 note is output when starting the test program.

Check that the C4 note is output when pushing the pedal and that the tone is turned

off when releasing the pedal.


37 037:MIDI Chk After connecting the [MIDI IN] jack and [MIDI OUT] jack with a MIDI cable, execute the

test.

Check that the C4 note is output and that the test result appears on the LCD.

41 041:ROM Chk2 Checks the ROM. The test result appears on the LCD.

42 042:RAM Chk2 Checks the RAMs that are connected to the CPU.


48 048:Test Exit Exit from the test program after executing this test.

2. INITIALIZE

Except for the data listed below, all PSR-240/248 panel settings are reset to their initial settingswhenever the power is turned on. The data listed below are backed up (i.e.retained in the

memory) as long as either an AC adaptor is connected or a set of batteries is installed.

• User Song Data • Metronome Volume

• User One Touch Setting Data • Touch On/Off

• One Touch Setting Bank Number • Touch Sensit ivity

• EZ Chord Data • Split Point

• EZ Chord Bank Number Data • Accompaniment Split Point

• Smart Chord Number • Footswitch Assign Function

Data Initialization

All data can be initialized and restored to the factory preset condition by turning on the power

while holding the highest (rightmost) white key on the keyboard. “CLr Backup” will appear briefly

on the display.

• All one touch setting (user) and

song memory data, plus the

other settings listed above, will

be erased and/or changed

when the data initialization pro-

cedure is carried out.

• Carrying out the data initial-

ization procedure will usually

restore normal operation if the

PSR-240/248 freezes or be-

gins to act erratically for any

reason.



PSR-240/248

[Portable Keyboard] Date: 7-JAN-1999

Model: PSR-240MIDI Implementation Chart

Version: 1.0

Function Transmitted Recognized Remarks

Basic Default 1-7, 10 1-7, 10

Channel Changed X X

Default 3 3

Mode Messages X X

Altered ************** X

Note 0-127 0-127

Number : True voice ************** 0-127

Velocity Note ON O 9nH, v=1-127 *1 O 9nH, v=1-127

Note OFF X 9nH, v=0 X 9nH, v=0 or 8nH

After key’s X X

Touch Ch’s X X

Pitch Bender X X

Control Change 0, 32 O *2 O *2 Bank Select MSB, LSB1 X X Modulation Depth

6, 38 X X Data Entry MSB, LSB7 O O Volume

10 O O Pan

11 X X Expression64 O O Sustain66 X X Sostenuto84 O O Portamento Controllers91 X X Reverb Depth96 X X RPN Inc97 X X RPN Dec

100, 101 X X RPN LSB, MSB120 X X All Sound Off121 X X Reset All Controllers

Program O *3 O *3

Change : True # ************** *3

System Exclusive O *4 O *4

System : Song Position X X



Note: See parts list for details of circuit board com

(ƒ}) : Mylar Capacitor

(ƒZ) : Ceramic Capacitor

(”¼ƒZ ) : Semiconductive Ceramic Capacitor

M : 28CC1-8813051 0

MIDI : 28CC1-8813051 0

INV : 28CC1-8813051 0

VR/SW : 28CC

PN1/2 : 28CC

PN2/2 : 28CC

WARNING

Components having special characteristics are mmust be replaced with parts having specification

originally installed.

PSR 240/248



PSR-240/248

MKC : 28CC1-88130

MK-L : 28CC1-88113

MK-H : 28CC1-88113

Note: See parts list for details of circuit board component

yamaha psr-240 service manual

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