casio AP-40 Service Manual

AP-40

INDEX

AUG. 2000

AP-40

DIGITAL PIANO

Ver.1 Oct. / 2000

CONTENTS

Page

Specifications ..........................................................................................................................................................1

Block Diagram.........................................................................................................................................................2

PCB Layout.............................................................................................................................................................3

Disassembly Instructions ........................................................................................................................................4

Circuit Description ...................................................................................................................................................8

Major Waveforms ..................................................................................................................................................10

Printed Circuit Board .............................................................................................................................................11

Troubleshooting ....................................................................................................................................................12

Wiring Diagram .....................................................................................................................................................16

Exploded View ......................................................................................................................................................17

Parts List ...............................................................................................................................................................19

Schematic Diagrams .............................................................................................................................................22

SPECIFICATIONS

GENERAL

Keyboard: 88 piano keys (with touch response)
Polyphonic: 32 notes, maximum
Tones: • 10 (including two bass tones)

• Tuning Curves: 3 (preset for each tone)

• Layer: Adjustable volume

• Split: Split point, adjustable volume
Digital Effects: Reverb (4 types), Chorus, Tremolo, Brilliance
Demo Tunes: • Number of Tunes: 8

• Playback: Repeat (all tunes, one tune)
Memory: • Operations: Real-time recording, playback

• Number of Tracks: 2 (Track A, Track B)

• Capacity: Approximately 5,000 notes (total of 2 tracks)

• Memory Backup: Built-in lithium battery (Battery Life: 5 years)
Song Lesson: • Number of Tunes: 80

• Playback: All song repeat, specific song

• Part Off: L, R

• Phrase Repeat
Pedals: Damper, Soft, Sostenuto

Other Functions: • Metronome: Beat (6 types), Tempo ( = 30 to 300)

• Touch Select: 3 types

• Transpose: 1 octave (F# to C to F)

• Tuning: A4 = 440Hz ±13Hz (adjustable)

• Temperament: 7 types

• Baroque pitch
MIDI: 16 multi-timbre receive
Input/Output: • Headphones: Stereo standard jacks × 2

• LINE OUT (R)(L): Monaural standard jacks × 2

Output impedance: 22KΩ
Output voltage: 2.0V (RMS) MAX

• LINE IN (R)(L): Monaural standard jacks × 2

Input impedance: 30KΩ
Input voltage: 200mV

• MIDI (OUT) (IN)
Speakers: Ø 16cm × 2, Ø 5cm × 2 (Output: 30W + 30W)
Power Supply: 120V (for U.S.A.), 120V, 220V, 230V and 240V (for other countries) AC household

current via AC power cord supplied with piano.
Power consumption: 70W (with 120V AC), 90W (with 220V, 230V and 240V AC)
Dimensions: • CELVIANO Only: 139.0 × 54.0 × 24.9 cm (54 3/4 × 21 1/4 × 9 13/16 inch)

• CELVIANO and Stand: 139.0 × 54.0 × 88.4 cm (54 3/4 × 21 1/4 × 34 13/16 inch)

Weight: • CELVIANO Only: approximately 48.5kg (107.1 lbs)

• CELVIANO and Stand: approximately 63.6kg (140.4 lbs)

— 1 —

BLOCK DIAGRAM

A0 ~ 19

RAM 256K

TC55257DFL-70L

LSI3

ROM 8M

MSM538002E-

W1-GS-K

LSI2

BRILLIANCE

A0 ~ 14

D0 ~ 7

PB4 ~ 6

D0 ~ 7

PEDAL

CPU

HD6435328RF35F

LSI1

HG51B155FD

MIDI

IN

OUT

M-IN M-OUT

DSP

LSI 7

P70 ~
P77

MUTE

Keyboard
Controller

HG52E35P

LSI10

P12 ~
P14

Switch & LED

Controller

uPD65005GF-419

LSI301

RST

RA0 ~ 22

RD0 ~ 15

EA0 ~ 14

ED0 ~ 15

KC0 ~ 7

FI0 ~ 10
SI0 ~ 10

L18 ~ 28

KI0 ~ 3

LA ~ LG, LP

LK8 ~ 14

Reset IC

MB3771PF

IC5

Keyboard

Buttons

LEDs

ROM 24M

MX23C2410MC-

TC55257DFL-70L

12CA58

LSI6

RAM 256K × 2

× 2

LSI8,9

AVCC

AVDD

AVFF

+15V

+5V

–15V

NJM78L05A

NJM7805FA

NJM78M15FA

T101

Power Switch

VDD

+5V

IC401,403,404

Power

Transformer

Voltage

selector

SOLM, SOLP

D/A Converter

uPD6376GS

Filter

Main

Volume

LINE OUT

LINE IN

Tweeter Tweeter

Mixer, Mute Circuit

Power Amp.

STK4132MK

BDK, WOK1, SORM, SORP

D/A Converter

uPD6376GS

LSI 5LSI 4

IC405

Filter

SPSP

HEADPHONE

— 2 —

PCB LAYOUT

PS11

PS2M

MA1M

PS3M

CN2M

CONTROL MIDI

BRILLIANCE

MELLOW BRIGHT

VOLUME

MIN

ROOM
STAGE

CHORUS

HALL 1

TREMOLO

HALL2

CHORUS/TREMOLO

MAX

POWER

ON
OFF

E

TRANSPOSE

E

TUNE

E

MIDI

E

BRILLIANCE

E

METRONOME VOL

CONTROL

PIANO 1 PIANO 2 E.PIANO

TONE

PIPE ORGAN STRINGS VIBRAHONE CHOIR

HARPSICHORD

LOWER TONE

CN1M

W. BASS

LIGHT
MIDDLE
HEAVY
TOUCH SELECT

E. BASS

MALTI FUNCTION DISPLAY

VALUE

TEMPO/BEAT/

FIXED

KY2MKY1M

SONG

PLAY/STOP PART

TRACKLRRECORD

AB

SONG LESSON/MEMORY

PHRASE REPEATPHRASE REPEAT NEXTMETRONOMEREVERB

DEMO

KY3M

PS4M

PCB JCM434- Components

Main PCB MA1M CPU, DSP, Sound Source ROM Working storage RAM,

Effect RAM Reset IC, DAC, Filter, Key con-troller, Power
amp, Power supply circuit

Jack PCBs PS2M LINE IN/OUT jack, MIDI jacks

PS3M Phone jacks
PS4M Power indicator

Console PCBs CN1M Gate array (Button controller/LED driver), LEDs, Buttons

CN2M Main Volume, Brilliance volume, LEDS, Buttons

Power PCB PS11 Fuse, Noise filter

— 3 —

DISASSEMBLY INSTRUCTIONS

1. Disassembling top board

1-1. Remove 8 screws on the rear.
1-2. Slide the top board towards the rear.

The top board will be free from catches on the case.

1-3. Lift the top board.

2. Disassembling keyboard cover

2-1. Slide the keyboard cover to open fully.
2-2. Passing the gear into the opening on each rack, lift the

keyboard cover.

— 4 —

3. Disassembling console panel

Note: To avoid scratch on the side board, put paper between the console panel and the side board at both

ends.

Insert paper here. Insert paper here.

3-1. Remove three screws afixing the console panel.
3-2. Remove the screw fixing a grounding wire at the transformer.
3-3. Disconnect two connectors CF on PCB JCM434-PS2M and CD on PCB JCM434-MA1M

3-4. Slide the console panel towards the front to free from catches.
3-5. Turn round the console panel.
3-6. Remove the 2 screws fixing the power switch.

— 5 —

4. Disassembling front cover

4-1. Remove 9 screws at the front edge on the bottom.
4-2. Unscrew 2 screws and remove JCM434-PS4M

5. Removal of keyboard unit

5-1. Disconnect connector CA on the PCB MA1M.
5-2. Remove 24 screws that affix the keyboard unit

(16 on the bottom of the case and 8 on the
keyboard unit).

5-3. Lift and remove the keyboard unit.

Keyboard screws

Front cover screws

Keyboard screws

Connector (CA)

Bottom

— 6 —

6. Removal of keys

6-1. While plying the side partition plastics with tweezers, push

the edge of the key toward front.

7. Disassembling keyboard PCBs

7-1. Turn round the keyboard unit to face the PCB up.
7-2. Disconnect the connector at the middle of keyboard.
7-3. Remove screws on the keyboard PCBs.

8. Replacing the main PCB

Note: The main PCB contains a lithium battery for memory back-up . Please remo ve the jumper bef ore replacing

the PCB. And mak e sure that the jumper is reset on ne w main PCB after replacing the PCB. Because no
jumper is set on a spare part of the main PCB.

Lithium battery

Jumper

— 7 —

KEYMATRIX

CIRCUIT DESCRIPTION

Second contact First contact

FI
KC
SI

KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7
FI0 A0 1 A0 # 1 B0 1 C1 1 C1 # 1 D1 1 D1 # 1 E1 1
SI0 A0 2 A0 # 2 B0 2 C1 2 C1 # 2 D1 2 D1 # 2 E1 2
EI1 F1 1 F1 # 1 G1 1 G1 # 1 A1 1 A1 # 1 B1 1 C2 1
SI1 F1 2 F1 # 2 G1 2 G1 # 2 A1 2 A1 # 2 B1 2 C2 2
FI2 C2 # 1 D2 1 D2 # 1 E2 1 F2 1 F2 # 1 G2 1 G2 # 1
SI2 C2 # 2 D2 2 D2 # 2 E2 2 F2 2 F2 # 2 G2 2 G2 # 2
FI3 A2 1 A2 # 1 B2 1 C3 1 C3 # 1 D3 1 D3 # 1 E3 1
SI3 A2 2 A2 # 2 B2 2 C3 2 C3 # 2 D3 2 D3 # 2 E3 2
FI4 F3 1 F3 # 1 G3 1 G3 # 1 A3 1 A3 # 1 B3 1 C4 1
SI4 F3 2 F3 # 2 G3 2 G3 # 2 A3 2 A3 # 2 B3 2 C4 2
FI5 C4 # 1 D4 1 D4 # 1 E4 1 F4 1 F4 # 1 G4 1 G4 # 1
SI5 C4 # 2 D4 2 D4 # 2 E4 2 F4 2 F4 # 2 G4 2 G4 # 2
FI6 A4 1 A4 # 1 B4 1 C5 1 C5 # 1 D5 1 D5 # 1 E5 1
SI6 A4 2 A4 # 2 B4 2 C5 2 C5 # 2 D5 2 D5 # 2 E5 2
FI7 F5 1 F5 # 1 G5 1 G5 # 1 A5 1 A5 # 1 B5 1 C6 1
SI7 F5 2 F5 # 2 G5 2 G5 # 2 A5 2 A5 # 2 B5 2 C6 2
FI8 C6 # 1 D6 1 D6 # 1 E6 1 F6 1 F6 # 1 G6 1 G6 # 1
SI8 C6 # 2 D6 2 D6 # 2 E6 2 F6 2 F6 # 2 G6 2 G6 # 2
FI9 A6 1 A6 # 1 B6 1 C7 1 C7 # 1 D7 1 D7 # 1 E7 1
SI9 A6 2 A6 # 2 B6 2 C7 2 C7 # 2 D7 2 D7 # 2 E7 2

FI10 F7 1 F7 # 1 G7 1 G7 # 1 A7 1 A7 # 1 B7 1 C8 1
SI10 F7 2 F7 # 2 G7 2 G7 # 2 A7 2 A7 # 2 B7 2 C8 2

LSI

HG52E35P

— 8 —

BUTTON MATRIX

KI0 KI1 KI2 KI3
L18 STEP BY STEP PART L PART R NEXT
L19 TOUCH SELECT TRACK A TRACK B PLAY/STOP
L20
L24 PIANO 2 E. PIANO HARPSICHORD W.BASS
L25 PIANO 1 STRINGS CHOIR E.BASS
L26 VIBRAPHONE PIPEORGAN
L27 SONG SELECT RECORD
L28 VALUE DOWN VALUE UP DEMO

TEMPO/BEAT/FIXED

METRONOME

CHORUS/TREMOLO

POWER SUPPLY CIRCUIT

The power supply circuit generates four voltages as shown in the following table.

Name Voltage For operation of

VDD +5 V CPU, Reset IC, Working storage RAM, DSP, Key touch LSI, Sound source

ROM, Effect RAM, Gate array
A VDD +5 V DAC
A VCC +15 V Filter, Mixer

A VFF –15 V Filter , Mixer

REVERB

— 9 —

MAJOR W A VEFORMS

A 1ms

1

2

˜˜

CH1 .2V CH2 .2V

1 Filter output L-ch CF connector pin 4
2 Filter output R-ch CF connector pin 5

Tone : Piano 1
Key : A4

A 2ms

6

CH1

CH2

CH1

A 20 µs

3

4

5

˜

CH1 5V CH2 5V

CH3 5V

3 Key scan signal KC0 CA connector pin 20
4 Key scan signal KC1 CA connector pin 19
5 Key scan signal KC2 CA connector pin 18

CH1

CH2

CH3

7

8

CH1 5V CH2 5V

CH2 5V

6 Button scan signal L24 UPD65005GF-419 pin 53
7 Button scan signal L25 UPD65005GF-419 pin 54
8 Button scan signal L26 UPD65005GF-419 pin 55

CH2

CH3

— 10 —

JCM435-MAIN

PRINTED CIRCUIT BOARD

T op View

Bottom View

— 11 —

1. No power

TROUBLESHOOTING

Check fuse F101.

Is F101 blown up?

No

Check fuses F402, F403, and F404.

Are the fuses blown up?

No

Measure output voltages of
the transformer.

Yes

Replace main PCB. No

Are the voltages 40 V AC

and 8 V AC?

Check the power switch.

Yes

Replace F401.

Yes

Replace F402, F403, and F404.

Is it OK?

Yes

Check position of voltage
selector.

Is it OK?

Yes

Replace the transformer.

— 12 —

No

Replace the power switch.

No

Set the voltage selector at
proper position.

2. No sound

Does the power indicator

light up?

Yes

Check the main volume.

Is it OK?

Yes

Disconnect CA and CB
connectors on the main PCB.

Press Demo button.

Does the demo tune sound?

No

Follow "No power"
troubleshooting.

No

Replace main volume.

No

Replace keyboard PCBs.

3. Distorted sound

Check the voltage selector.

Yes

Is it at proper position?

Yes

Replace the main PCB.

Replace the main PCB.

No

Set the voltage selector at
proper position.

— 13 —

4. Certain keys do not function

Replace the main PCB.

Do the keys function?

No

Replace keyboard PCBs.

5. A certain key does not function

Clean the contact.

Does the key function?

No

Replace the key contact rubber.

Yes

End

Yes

Does the key function?

No

Replace keyboard PCBs.

Does the key function?

No

Replace the main PCB.

Yes

Yes

End

— 14 —

6. A certain button does not function

Replace the console PCBs.

Does the button function?

No

Replace MA1M PCB.

Yes

7. A certain tone is strange when record/playback

Check the cord of pedal unit

Is it disconnected?

No

Replace the main PCB.

Yes

End

Connect the cord

— 15 —

WIRING DIAGRAM

JCM434-PS11

AC PLUG

W
R

PPYBR

PPYBR

POWER

TRANSFORMER

CE1
CE2
CE3
CE4

O
O
W
W
BK

BL
GY

S4
S3
S

C

S1

POWER

Switch

2

O
O
W
W
BK

LT–

LT+

CM-W

CM-BK

RT–

LSP+

CL-R

RT+

CN-W

CN-BK

LSP–

CL-BK

JCM435-MA1M

PHONE

JCM434-PS3M

CG-3

CG-4

CG-5

CG-6

CG-7

RSP–

CR-R

RSP+

CR-BK

L-HP

CG-7

R-HP

CG-6

RSP

CG-5

AG

LSP

CG-4

CG-3

JCM434-PS2M

CA1

CA2

CA3

CA4

CA5

CA6

CA7

CA8

CA9

CA10

CG-2

DG

CG-2

CA11

CA12

CG-1

LVD

CG-1

CA13

CA14

LINE IN

CA15

CA16

POWER Lamp

CH-1

LVD

CH-2

DG

JCM434-PS4M

R OUTINLRL

CC-10

CC-11

FG

M-OUT

CC-10

CC-11

CC-11 CC-11

CA17

CA18

CA19

CA20

CA21

CH-1
CH-2

LINE OUT MIDI

CC-2

CC-3

CC-4

CC-5

CC-6

CC-7

CC-8

CC-9

AG

DG

VDD

M-IN

AVDD

CA22

MUTE

CC-8

CC-9

CA23

CA24

CC-7

CA25

CC-6

CA26

CA27

CC-5

CA28

L-mel1

L-mel2

CC-3

CC-4

CD-1
CD-2
CD-3
CD-4
CD-5
CD-6
CD-7
CD-8
CD-9
CD-10
CD-11
CD-12
CD-13
CD-14
CD-15

CA29

CA30

R-mel2

CC-2

CF-1
CF-2
CF-3
CF-4
CF-5

CC-1

R-mel1

CC-1

DG

VDD

RESET

P93
P94
P90
P14
P13
P12
P73
P72
P71

P70
VDDT
PB7

CD-1
CD-2
CD-3
CD-4
CD-5
CD-6
CD-7
CD-8
CD-9
CD-10
CD-11

JCM434-CN1M

CD-12
CD-13
CD-14
CD-15

R-mel IN
L-mel IN

AG
L-mel OUT
R-mel OUT

LK14

JK-1

LK13

JK-2

LK12

JK-3

LK11

JK-4
JK-5
JK-6
JK-7
JK-8
JK-9
JK-10
JK-11

JJ-1

DGT

JJ-2
JJ-3

VDDT

JJ-4
JJ-5
JJ-6
JJ-7
JJ-8
JJ-9
JJ-10
JJ-11
JJ-12

Lg
Le

Ld

Lc
Lb
La

PB7

KI3
KI2
KI1
KI0
L26
L25
L24
L20
L19

CF-1

CF-2

CF-3

CF-4

CF-5

JK-1
JK-2
JK-3
JK-4
JK-5

Lf

JK-6
JK-7
JK-8
JK-9
JK-10
JK-11

JJ-1
JJ-2
JJ-3
JJ-4
JJ-5
JJ-6
JJ-7
JJ-8
JJ-9
JJ-10
JJ-11
JJ-12

JCM434-CN2M

SOFT

SOST

DAMPER

CE1

CE2

CE3

PEDAL

UNIT

VDDT

CE4

FI9

FI8

FI7

FI6

FI10

CA1

SI10

CA2

CA3

SI9

CA4

CA5

SI8

CA6

CA7

SI7

CA8

CA9

SI6

CA10

FI5

CA11

SI5

CA12

KC7

CA13

KC6

CA14

KC5

CA15

KC4

CA16

KC3

CA17

KC2

CA18

KC1

CA19

KC0

CA20

SI4

CA21

FI4

CA22

SI3

CA23

FI3

CA24

SI2

CA25

FI2

CA26

SI1

CA27

FI1

CA28

SI0

CA29

FI0

CA30

JCM887T-KY1M JCM887T-KY2M JCM887T-KY3M

JX-1

JX-2

JX-3

JX-4

JX-5

JX-6

JX-7

JX-8

JX-9

JX-10

JX-11

JX-12

JX-13

JX-14

JX-15

JX-16

JX-16

JX-15

JX-14

JX-13

JX-12

JX-11

JX-10

JX-9

JX-8

JX-7

JX-6

JX-5

JX-4

JX-3

JX-2

JX-1

JY-1

JY-2

JY-3

JY-4

JY-5

JY-6

JY-7

JY-8

JY-9

JY-10

JY-11

JY-12

JY-13

JY-14

JY-15

JY-16

JY-16

JY-15

JY-14

JY-13

JY-12

JY-11

JY-10

JY-9

JY-8

JY-7

JY-6

KC7
KC6
KC5
KC4
KC3
KC2
KC1
KC0

SI3
FI3
SI2
FI2
SI1
FI1
SI0
FI0

— 16 —

KC0
KC1
KC2
KC3
KC4
KC5
KC6
KC7

SI7
FI7
SI8
FI8
SI9

FI9
SI10
FI10

JY-5

JY-4

JY-3

JY-2

JY-1

CABINET

R-4

EXPLODED VIEW

R-3

37

38

R-2

R-5

10

36

35

33

38

4

5

8

11

9

32

1

34

3

8

R-6

31

2

9

6

13

24

22

R-1

14

15

16

17

18

19

27

7

26

23

30

25

28

21

20

— 17 —

29

12

STAND

R-8R-7

R-9

39

40

— 18 —

PARTS LIST

AP-40

Notes: This parts list does not include the cosmetic parts, which

parts are marked with item No. "R-X" in the exploded
view.
Contact our spare parts department if you need these
parts for refurbish.

1. Prices and specifications are subject to change with­out prior notice.

2. As for spare parts order and supply, refer to the
"GUIDEBOOK for Spare parts Supply", published
seperately.

3. The numbers in item column correspond to the same
numbers in drawing.

PARTS PRICE LIST

- 20 -

AP-40

N Item Code No. PART NAME Specification Price Code R

Main PCB

N 1 1003 2486 PCB ASSY/MA1M M241412*1 TK(M435) 1 1 DT A

BT1 3815 0794 BATTERY / LITHIUM CR2032/1VC1 1 1 AI X

D1-D4 2390 2555 DIODE / SHOTTKY RB500V-40TE-17 4 4 AB C

D5 2390 2555 DIODE / SHOTTKY RB500V-40TE-17 1 1 AB C

D6 2360 3057 DIODE / ZENER UDZTE-173.3B 1 1 AA C
IC1 2105 1120 IC / MOS TC7S08F-TE85R 1 1 AB C
IC2 2105 6354 IC / MOS TC74HC27AF(TP1) 1 1 AC C
IC3 2105 6353 IC / MOS TC74HC11AF(TP1) 1 1 AC C
IC4 2105 6355 IC / MOS TC7S00F(TE85R) 1 1 AC C
IC5 2114 4060 IC MB3771PF-EF 1 1 AK C

LSI1 2012 5844 LSI HD6435328RF35F 1 1 BZ B

LSI10 2011 5194 LSI HG52E35P 1 1 BJ B

N LSI2 1002 5582 LSI MSM538002E-W1-GS-K 1 1 AV B

LSI3,LSI8,LSI9 2012 5572 LSI TC55257DFL-70L(EL) 3 3 AS B

LSI4,LSI5 2114 4221 LSI UPD6376GS-E1 2 2 AS B

LSI6 2012 5707 LSI MX23C2410MC-12CA58 1 1 BO B
LSI7 2012 1316 LSI HG51B155FD-1 1 1 BU B

Q1,12 2250 1162 TRANSISTOR 2SA1576A-T106R 2 2 AA C

Q3 2250 1162 TRANSISTOR 2SA1576A-T106R 1 1 AA C
Q4 2252 0637 TRANSISTOR 2SC4081-T106R 1 1 AA C

X1 2590 2100 OSCILLATOR / CERAMIC CSACS20.00MX040-TC 1 1 AG C

X2 2590 2709 OSCILLATOR / CERAMIC HC-49US16384 1 1 AL C

Console PCB

LED306 - LED332 2370 0630 LED LN282RPX-(TX3) 27 27 AB C

LED302 2370 1386 LED LN282RPX(V)-(TX2) 1 1 AB C

LED303 - LED305 2370 0679 LED LN382GPX-(TX2) 3 3 AB C

LED301 2370 0497 LED LB-603VP 1 1 AT C

IC301 2114 3318 IC BA612 1 1 AI C

LSI301 2011 0812 LSI UPD65005GF-419 1 1 AT B
Q309 - Q312 2220 1409 TRANSISTOR 2SC1740SR-TP-T 4 4 AA C
Q301 - Q308 2259 1883 TRANSISTOR DTA114TS-TP-T 8 8 AA C

SW301 - SW329 3412 0903 SWITCH / TACT EVQ-21405R 29 29 AA C

VR301 2765 0280 POTENTIOMETER EWA-NAXCH1B14 1 1 AI C

VR302 2765 2187 POTENTIOMETER EWA-NFECH1B54 1 1 AG C

2 6926 2060 PCB ASSY/CN1M M140658*1 1 1 CS B
3 6926 2070 PCB ASSY/CN2M M140659*1 1 1 CN B

Power supply PCB

D405 - D408 2390 3022 DIODE 3BZ41(LC6-15) 4 4 AD C

D416 2390 1323 DIODE RB100A-T32-T 1 1 AC C

D422/423 2360 1729 DIODE MTZJ5.1AT-77-T 2 2 AA C

F402 3632 0273 FUSE / TIME-LAG (For 110 - 127V AREA) UL-TSC-1.6A-N1 1 1 AF B

F402 3631 1045 FUSE / TIME-LAG (For 220 - 240V AREA) (S)T-1.6A 1 1 AF B
F403 / 406 3632 0420 FUSE / TIME-LAG (For 110 - 127V AREA) UL-TSC-6.3A-N1 2 2 AF B
F403 / 406 3632 0427 FUSE / TIME-LAG (For 220 - 240V AREA) (S)T-6.3A 2 2 AF B

IC401 2114 5794 IC NJM78M15FA 1 1 AE C
IC402 2114 5795 IC NJM79M15FA 1 1 AG C
IC403 2114 5797 IC NJM78L05A(T3) 1 1 AE C
IC404 2114 3444 IC NJM7805FA 1 1 AE C
IC405 2114 2149 IC STK4152MK2 1 1 BP C

IC406/408/410/411 2114 1799 IC M5218APR 4 4 AC C

IC409 2252 1248 IC / PHOTO COUPLER HCPL-261A 1 1 AL C
J401/402 3612 0584 JACK YKB21-5012 2 2 AD C
J403/404 3612 0789 JACK YKB21-5010 2 2 AC C

J405 3501 4816 JACK / DIN YKF51-5051 1 1 AH C

Q401 - Q404 2254 0551 FET 2SK365-BL(TPE4) 4 4 AC C

4 6926 5800 PCB ASSY/PS2M (For 110 - 127V AREA) M140654*2 1 1 DH B

N 4 1003 2464 PCB ASSY/PS2M (For 220 - 240V AREA) M140654*3 TK(M435) 1 1 DI B

Q

BK BN

N Item Code No. PART NAME Specification Price Code R

R

- 21 -

PS11,PS3,PS4 PCBs

J406 3613 1533 JACK HLJ4336-01-3040 1 1 AP C
F401 3632 0720 FUSE / TIME-LAG (For 110 - 127V AREA) MT4-3.15A-N1 1 1 AG B
F401 3631 1045 FUSE / TIME-LAG (For 220 - 240V AREA) (S)T-1.6A 1 1 AF B

L401 3013 2577 COIL / CHOKE PLAC1522R0R01B1 1 1 AM C

LED401 2320 9748 LED LN28RPH 1 1 AB C
SW402 3613 1740 VOLTAGE SELECTOR HXW1219-01-110 1 1 AK C

5 6926 2160 PCB ASSY/PS11 (For 110 - 127V AREA) M340695*1 1 1 BR B

N 5 10032465 PCB ASSY/PS11 (For 220 - 240V AREA) M340695*2 TK(M435) 1 1 BW B

6 6926 2030 PCB ASS'Y/PS3M M340697*1 1 1 BV B

N 7 1003 2488 PCB ASS'Y/PS4M M340698*1 TK(M435) 1 1 BH B

Other electrical parts

8 3831 1077 SPEAKER SG16G51BFA 2 2 BS B

9 3831 1075 SPEAKER / TWEETER S05JH37A 2 2 AR B
10
11 3012 1593 TRANSFORMER TE-434-1M1 1 1 CL B

12 6927 3230 UNIT/KEYBOARD M140830*1 1 1 EO B
13 6927 3250 HAMMER/WHITE KEY M340962*1 52 52 BF C
14 6927 3260 HAMMER/BLACK KEY M340963*1 36 36 BF C
15 6927 4040 WHITE KEY/C M140783-1 7 7 AH B
16 6927 4050 WHITE KEY/D M140785-1 7 7 AI B
17 6927 4060 WHITE KEY/E M140786-1 7 7 AH B
18 6927 4070 WHITE KEY/F M140787-1 7 7 AI B
19 6927 4080 WHITE KEY/G M140788-1 7 7 AH B
20 6927 4090 WHITE KEY/A M140789-1 7 7 AH B
21 6927 4100 WHITE KEY/B M140790-1 8 8 AI B
22 6927 4110 WHITE KEY/SA M140792-1 1 1 AM B
23 6927 4120 WHITE KEY/SC M140791-1 1 1 AN B
24 6927 4030 BLACK KEY M140784-1 36 36 AG B
25 6928 4470 RUBBER/CONTACT AB M240957-2 1 1 AE B
26 6928 4480 RUBBER/CONTACT CB M240958-2 6 6 AH B
27 6928 4490 RUBBER/CONTACT CS M240959-2 1 1 AH B

N 28 1000 9529 PCB ASSY/KY1M M240951A*1 1 1 BO B
N 29 1000 9530 PCB ASSY/KY2M M240952A*1 1 1 BT B
N 30 1000 9531 PCB ASSY/KY3M M241019A*1 1 1 BM, B

N 31 6926 2420 BUTTON SET 434 M240744*1 1 1 AU B

32 6924 5260 BUTTON / POWER M340318-1 1 1 AA B
33 6919 3241 KNOB / SLIDE M311405A-1 2 2 AB A
34 6924 4710 SWITCH ASS'Y / POWER M340337*1 1 1 BK B
35 6926 2440 PANEL / DISPLAY M240668-1 1 1 AE C
36 6926 2450 PLATE / DISPLAY M340658-1 1 1 AE C
37 6924 5121 SHAFT M440300A-1 1 1 BA C
38 6924 5140 GEAR 4247002100 2 2 AC C

N 39 1003 2481 PEDAL BOX M241399*2 TK(M435) 1 0 DM B
N 39 1003 2480 PEDAL BOX M241399*1 TK(M435) 0 1 DO B
N 40 1002 7739 SCREW SET CA024/021 1 1 BE B

3613 0217 RECEPTACLE NC-174-10-C

Keyboard unit

Mechnical parts

Stand

AC cord

3701 0196 AC CORD (For 110 - 127V AREA) UC-964-J01 1 1 BN C
3701 0595 AC CORD (For 220 - 240V, EUROPE) EC-654-E06 1 1 BP C
3701 1008 AC CORD (For 230V, UK) SP22-17022A 1 1 CD C

Q

BK BN

1 1 AJ B

Notes:N-New parts

- A:Essential
Q-Quantity used per unit B:Stock recommended
R-Rank C:Others

X:No stock recommended

Main PCB JCM435-MA1M

SCHEMATIC DIAGRAMS

CPU

ROM (8M) RAM (256K)

D/A
Converter

ROM (24M)

D/A
Converter

DSP

Key
controller

To Pedal Unit

Reset IC

543

RAM

(256K)

RAM

(256K)

— 22 —

I/O PCBs JCM434-PS2M, Phone Jack PCBs JCM434-PS3M, LED PCBs JCM 434-PS4M, Power PCBs JCM 434-PS11

Mute

Power Supply circuit

Power Amp.

Mute

Mixer

Filter

1

2

— 23 —

Console PCBs JCM434-CN1M

8

Switch & LED Controller

7

6

— 24 —

Console PCBs JCM434-CN2M

— 25 —

Keyboard PCB JCM887T-KY1M

— 26 —

Keyboard PCB JCM887T-KY2M

— 27 —

Keyboard PCB JCM887T-KY3M

— 28 —

Ver.1 : Correction of page 21, due to parts code misprinted.

CASIO TECHNO CO.,LTD.

Overseas Service Division

Nishi-Shinjuku Kimuraya Bldg. 1F
5-25, Nishi-Shinjuku 7-Chome
Shinjuku-ku, Tokyo 160-0023, Japan