Casio Celviano AP-21 User manual

ELECTRONIC KEYBOARD
AP-21
MAY 1999
AP-21

— 1 —
CONTENTS
Safety Notice...................................................................................... 1
Specifications .................................................................................... 2
Block Diagram ................................................................................... 3
PCB Layout ........................................................................................ 4
Disassembly Instructions ................................................................. 5
Circuit Description ............................................................................ 8
Major Waveforms............................................................................. 10
Troubleshooting .............................................................................. 11
Wiring Diagram ................................................................................ 14
Exploded View ................................................................................. 15
Parts List .......................................................................................... 16
Schematic Diagrams ....................................................................... 19
SAFETY NOTICE
CAUTION!
Danger of explosion if battery is incorrectly replaced.
Replace only with the same of equivalent type recommended
by the appliance manufacturer.Discard used batteries
according to manufacturer's instructions.

— 2 —
SPECIFICATIONS
GENERAL
Number of keys: 88
Polyphonic: 32-note
Preset tones: Piano-1, Piano-2, Electric Piano, Harpsichord, Vibraphone, Pipe Organ, Strings,
Choir.
Keyboard Controls: Touch sensitivity (Initial touch: Light/Middle/Heavy),
Tuning curve (Standard/Electric piano/Flat),
Baroque pitch (On/Off)
Pedals: Soft/Sostenuto, Damper
Effects: Reverb (Room, Stage, Hall-1, Hall-2), Chorus, Tremolo, Brilliance
Transpose: F# - C - F
Tuning control: A4 = 440Hz ±50 cents
Demonstration tunes: 1: Polonais "Héroïque" (F.F. Chopin) 5: CASIO original
2: Frühlingslied Op. 62-6 (F. Mendelssohn) 6: jesus, Bleibet Meine Freude (J.S. Bach)
3: CASIO original 7: CASIO original
4: Harmonious blacksmith (G.F. Händel) 8: CASIO original
Memory: Real-time recording [Number of Songs: (A and B), Capacity: Approx. 3,000
notes total]
Backup Battery [Built-in lithium battery: BR2330, Battery life: Approx. 5years]
Terminals: LINE IN Jack [Input impedance: 30KΩ, Sensitivity: 200mV]
LINE OUT Jack [Out put impedance: 22KΩ, Output voltage: 2.0V (rms) MAX],
Phone Jack [6.3ø, stereo], MIDI jack (IN, OUT, THOUGH)
Speakers: 16cm dia. Approx. 20W input Rating: 2 pcs.
Power source: AC source (120V, 230/240V)
Power consumption: 48W (120V AC), 62W (230/240V AC)
Dimensions: 7-3/4" (H) ×54 (W) ×18 - 1/2" (D)
198mm (H) ×1370mm (W) ×470mm (D)
Weight: 36.4kg (80.3 lbs) /45.5kg (100.3 lbs) with stand
C2# D2# C6# D6# G6#F6# A6# C7# D7#
D2 G7
G1#
A0 B0 A2F1 F2G1 G2A1 B1 B2C1 D1 C6E1 E2 G6E6 F6 A6 B6 C7D6 E7 F7D7C2 C8B7A7
A1# A2#G2#F1# F2#D1#C1#AD# A7#G7#F7#
Nomenclature of keys

— 3 —
BLOCK DIAGRAM
Keyboard Pedal
unit
FI0~FI10
SI0~SI10
L1~L18
KI0
KI3
KC0~
KC7
Mute signal
D0~D7
SOLP
SORP
Reset signal
VDD (+5V)
AVDD (+5V)
AVCC (+15V)
AVFF (-15V)
Mute signal
IC 408
IC 411 Main
volume
BOK, WOK1
SOLM
SOLM
RD0~RD15
RA0~RA22
ED0~
ED15 EA0~ EA14
A0~A14
A0~A16
MIDI
OUT IN THROUGH
Damper SS SF
P10, P12~P16,
P93, P94, P97
P70~P77
P12~P14
BRILLIANCE
Key touch LSI
LSI 10
HG52E35P CPU
LSI 1
HD6435328RC13F
LSI-S
LSI 7
HG51B155FD-1
LSI4,5
UPD6376GS-E1
DAC
DAC
LPF
LPF
MIXER
IC 406
Reset IC
IC 5
Power supply
circuit
Power
amp.
IC 405
Sound Source Rom
(3M-bit)
LSI 6
MX23C2410MC-12CA58
System ROM
LSI 2
2M-bit
LH532KU3
Effector RAM
256K-bit
LSI 8, 9
TC55257DFL-70L
Working strage
LSI 3
SRAM 256K-bit
TC55257DFL-70L
LEDS
Console
Gate array
LSI 301
UPD65005GF
-419
~
KC0
KC4
~

— 4 —
PCB LAYOUT
PCB
Main PCB
Sub PCB
Console PCB
Other PCBs
JCM358-
MA1M
PS2M
CN1M
CN2M
PS12
PS3M
PS4M
Components
CPU, LSI-S, Sound Source ROM Working storage
RAM, Effect RAM Reset IC, DAC, Key Controller
Filter, Lineout Amp., Power Amp. Power supply cir-
cuit. MIDI input/output.
LEDs, Buttons, Gate array
Main Volume
Fuse
Head phone Jack
Power lamp
POWER
VOLUME
MIN MAX
TRANSPOSE/
TUNE/MIDI DIGITAL EFFECT CHORUS REVERB
REVERB2
REVERB1
TONE
PIANO E.PIANO HARPSI-
CHORD PIPE ORGAN STRINGS
SONG A
SONG B RECORD
START/
STOP
DEMO
MEMORY
OFF
ON
AP-21
MA1M
PS2M
PS12
PS3M
PS4M
CN1MCN2M
KY1M KY2M KY3M

— 5 —
DISASSEMBLY INSTRUCTIONS
1. Removal of top board
1-1. Remove 6 screws affixing the top board on the back.
1-2. Slide the top board forward and remove it from the main
unit.
2. Removal of keyboard cover
2-1. Lift up the keyboard cover full open position.
2-2. Unscrew the L-shaped stopper metal located on the inner
left corner.
2-3. Lift up the keyboard cover gear from the opening where
stopper metal is fixed then remove the keyboard cover.

— 6 —
5. Removal of keyboard unit
5-1. Disconnect connector CA on the PCB MA1M.
5-2. Remove 23 screws that affix the keyboard unit
(16 on the bottom of the case and 7 on the
keyboard unit).
5-3. Lift and remove the keyboard unit.
4. Removal of front cover
4-1. Remove 6 screws from the front end of the lower case.
4-2. Lift the front cover and remove the pilot lamp that is affixed
by 2 screws. Then remove the front cover.
3. Removal of console panel
3-1. Remove screws affixing both ends of the console panel.
3-2. Disconnect connector CD on PCB MA1M, connector CF on PCB PS2M, and transformer grounding
wire.
3-3. Lift the console panel and turn it over and remove the power switch, which is affixed by 2 screws.
Then remove the side panel.
Caution: Be careful not to scratch the side panels.
Earth cable Screw Connector (CD) Connector (CD)
screws
Keyboard screws
Front cover screws
Bottom
Keyboard screws

— 7 —
6. Removal of keys
6-1. While plying the side partition plastics with tweezers, lift
the edge of the key toward front.
7. Removal of keyboard PCB
7-1. Lay the keyboard so that keyboard PCBs face upward.
7-2. Remove screws on keyboard PCBs (10 screws on PCBs
KY1M and KY3M, 12 screws on KY2M).
7-3. Unsolder the cable.
8. Totes on replacing the main PCB.
A lithium battery is set on the main PCB for memory protection.
When you replace the main PCB, disconnect the jumper to open battery circuit.
Since there is no jumper on a new main PCB, be sure to set a jumper.
jumper

— 8 —
CIRCUIT DESCRIPTION
KEYMATRIX
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
FI
KC
SI
LSI
HG52E35P
Second contact First contact
1
2

— 9 —
POWER SUPPLY CIRCUIT
The power supply circuit generates five voltages as shown in the following table.
Name Voltage For operation of
VDD +5 V CPU, Reset IC, DSP, Sound source ROM, Working storage RAM, Effect RAM,
Key touch LSI, Gute array, LEDs
AVDD +5 V DAC
AVCC +15 V Filter, Mixer
AVFF -15 V Filter, Mixer

— 10 —
MAJOR WAVEFORMS
1Filter output L-ch CF connector pin 2
2Filter output R-ch CF connector pin 1
Tone : Piano 1
Key : A4
3Key scan signal KC0 CA connector pin 20
4Key scan signal KC1 CA connector pin 19
5Key scan signal KC2 CA connector pin 18
6Button scan signal L24 UPD65005GF-419 pin 53
7Button scan signal L25 UPD65005GF-419 pin 54
8Button scan signal L26 UPD65005GF-419 pin 55
CH1 .2V CH2 .2V
˜˜
A 1ms
CH1
CH2
1
2
CH1 5V CH2 5V
˜CH3 5V
A 20 µs
CH1
CH2
3
5
4
CH3
CH1 5V CH2 5V
A 2ms
CH1
CH2
6
7
CH2 5V
CH3
8

— 11 —
TROUBLESHOOTING
1. No power
Check fuse F401.
Is F401 blown up?
Check fuses F402, F403, and
F404.
Are the fuses blown up?
Are the voltages 21.6 V AC
and 8.4 V AC?
Is it OK?
Is it OK?
Measure output voltages of
the transformer.
Replace the transformer.
No
No
Replace F401.
Replace F402, F403, and
F404.
Yes
Yes
No
No
Yes
Yes
Yes
Replace main PCB. No
Replace the power switch.
Set the voltage selector at
proper position.
Check position of voltage
selector.
Check the power switch.

— 12 —
2. No sound
Does the power indicator
light up?
Check the main volume.
Is it OK?
Does the demo tune sound?
Replace keyboard PCBs.
Disconnect CA
connectors on the main PCB.
Follow "No power"
troubleshooting.
No
Yes
Yes
Yes
No
No
Replace main volume.
Press Demo button.
Replace the main PCB.
Replace PS2M PCB.
Is a sound ok? Yes
No
Replace MA1M PCB. End
3. Distorted sound

— 13 —
4. Certain keys do not function
5. A certain key does not function
Replace MA1M PCB.
Do the keys function? Yes
No
Replace keyboard PCBs. End
Clean the contact.
Does the key function?
Does the key function?
Yes
No
No
Replace the key contact rubber.
Replace keyboard PCBs. End
Yes
6. A certain button does not function
Replace CN1M PCB.
Does the button function? Yes
No
Replace MA1M PCB. End

— 14 —
WIRING DIAGRAM
JCM425-MA1M
JCM425-CN1M
JCM425-CN1M
JCM431-PS12
TRANSFORMER
JCM887T-KY1M JCM887T-KY2M JCM887T-KY3M
JCM425-PS2M
JCM425-PS4M
POWER LAMP SPEAKERS
PHONES
LEFT
RIGHT
POWER SWITCH
JCM425-PS3M
PEDAL
UNIT
CE-1
CE-2
CE-3
CE-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
DG
VDD
NRES
NRD
NWR
CE–
A2
A1
A0
DB3
DB2
DB1
DB0
VDDB
BRILLIANCE
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
CE-1 CE-2 CE-3 CE-4
SOFT
SOSTENUTO
DAMPER
VDDB
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 JY-5 JY-4 JY-3 JY-2 JY-1
FI0
SI0
FI1
SI1
FI2
SI2
FI3
SI3
KC0
KC1
KC2
KC3
KC4
KC5
KC6
KC7
FI10
SI10
FI9
SI9
FI8
SI8
FI7
SI7
KC7
KC6
KC5
KC4
KC3
KC2
KC1
KC0
CA1 CA2 CA3 CA4 CA5 CA6 CA7 CA8 CA9 CA10 CA11 CA12 CA13 CA14 CA15 CA16 CA17 CA18 CA19 CA20 CA21 CA22 CA23 CA24 CA25 CA26 CA27 CA28 CA29 CA30
CA1 CA2 CA3 CA4 CA5 CA6 CA7 CA8 CA9 CA10 CA11 CA12 CA13 CA14 CA15 CA16 CA17 CA18 CA19 CA20 CA21 CA22 CA23 CA24 CA25 CA26 CA27 CA28 CA29 CA30
FI10
SI10
FI9
SI9
FI8
SI8
FI7
SI7
FI6
SI6
FI5
SI5
KC7 KC6 KC5 KC4 KC3 KC2 KC1 KC0
SI4
FI4
SI3
FI3
SI2
FI2
SI1
FI1
SI0
FI1
JJ1 JJ2 JJ3 JJ4 JJ5
VDDB
BRILLIANCE
AGB
KC4
KI0
JJ1 JJ2 JJ3 JJ4 JJ5
CC1 CC2 CC3 CC4 CC5 CC6 CC7 CC8 CC9 CC10 CC11 CC12
Rmei1 Rmel2
Lmel1 Lmel2
AG
AVDD
VDD
DG
MUTE
Min
Mout
FG
CC1 CC2 CC3 CC4 CC5 CC6 CC7 CC8 CC9 CC10 CC11 CC12
CF1
CF2
CF3
CF4
CF5
S1
S2
S3
S4
C
RmelI
(BROWN)
LmelI
(RED)
AG
(BLACK)
Lmel0
(ORANGE)
Rmel0
(YELLOW)
CF1
CF2
CF3
CF4
CF5
L
N
CH1
CH2 LVD DG CH1 CH2
CG1 CG2 CG3 CG4 CG5 CG6 CG7
LVD
DG
AG
LSP
RSP
RHP
LHP
CG1 CG2 CG3 CG4 CG5 CG6 CG7
CL1 CL2 CR1 CR2
LSP– LSP+ RSP+ RSP–

— 15 —
1
11
11 10
12
14
15
16
17 18
19
30
31
32
33
34
20 21
22 23
24 25
26
27
28
29
2
3
4
5
6
R-1 R-2
R-5
R-7
R-8
R-9
R-10
R-11
R-6
R-3
R-4
13
9
8
7
× 2
× 1
× 4
× 4
× 8
× 2
× 2
× 4
EXPLODED VIEW

— 16 —
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 with-
out 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 LIST
AP-21

PARTS PRICE LIST
AP-21
NItem Code No. Part Name Specification QPrice Code RRemarks
Main PCB
BT1 3815 0794 BATTERY / LITHIUM CR2032/1VC1 1AI B
D1 - D4 2390 2576 DIODE / SCHOTTKY RB501V-40TE-17 4AB B
D5 2390 2576 DIODE / SCHOTTKY RB501V-40TE-17 1AB B
D6 2360 3057 DIODE / ZENER UDZTE-173.3B 1AA B
IC1 2105 1120 IC / L-MOS TC7S08F(TE85R) 1AB B
NIC2 2105 6657 IC / C-MOS TC74HC10AF(TP1) 1AB B
IC3 2011 8806 IC / C-MOS TC74HC04AF(TP1) 1AC B
IC5 2114 4060 IC / MONOLITHIC MB3771PF-EF 1AK B
LSI1 2011 5222 LSI HD6435328RC13F 1CB A
LSI10 2011 5194 LSI HG52E35P 1BJ A
NLSI2 2012 6404 LSI LH532KU3 1AT A
LSI3, LSI8 - LSI9 2012 5572 LSI TC55257DFL-70L(EL) 3AS A
LSI4 - LSI5 2114 4221 LSI UPD6376GS-E1 2AS A
LSI6 2012 5707 LSI MX23C2410MC-12CA58 1BO A
LSI7 2012 1316 LSI HG51B155FD-1 1BU A
Q1 - Q2 2250 1162 TRANSISTOR 2SA1576AT106R 2AA B
Q3 2250 1162 TRANSISTOR 2SA1576AT106R 1AA B
Q4 2252 0637 TRANSISTOR 2SC4081T106R 1AA B
SNF1 3025 1505 FILTER / EMI NFM51R00P106 1AC B
X1 2590 2100 OSCILLATOR CSACS20.00MX040-TC 1AG B
X2 2590 1043 OSCILATOR AT-49-16.384M 1AK B
16927 5470 PCB ASSY / M425-MA1M M241032*1 1EM A
Console PCB
D301 - D318 2390 1344 DIODE 1SS133T-77 18 AA B
NLED301 - LED317 2370 1416 LED SLZ-190B-03-T2 17 AA B
LSI301 2011 0812 LSI UPD65005GF-419 1AT A
SW301 - SW318 3412 0903 SWITCH / TACT EVQ-21405R 18 AA A
VR301 2765 0280 VOLUME EWA-NAXCH1B14 1AI A
VR302 2765 2187 VOLUME EWA-NFECH1B54 1AG A
26927 5560 PCB ASSY / M425-CN1,2M M241033*1 1DD A
Power supply PCB
D401 - D404, D415 2390 2996 DIODE 1SR139-400T-32 5AA B
D405 - D408 2390 3022 DIODE 3BZ41(LC6-15) 4AD B
D409 - D414
D417 - D421 2390 1344 DIODE 1SS133T-77 11 AA B
D416 2390 1323 DIODE RB100A-T32-T 1AC B
D422 - D423 2360 1729 DIODE / ZENER MTZJ5.1AT-77-T 2AA B
F402 3632 0719 FUSE / UL TIME-LAG UL-TSC-1A-N1 1AF AFor 110 - 127V area
F402 3631 1037 FUSE / TIME-LAG (S)T-1A 1AE A For 220 - 240V area
F403 - F404 3632 0301 FUSE / UL TIME-LAG UL-TSC-4A-N1 2AF AFor 110 - 127V area
F403 - F404 3632 0049 FUSE / TIME-LAG (S)T-4A 2AF AFor 220 - 240V area
IC401 2114 5794 IC / MONOLITHIC NJM78M15FA 1AE B
IC402 2114 5795 IC / MONOLITHIC NJM79M15FA 1AG B
IC403 2114 5797 IC / MONOLITHIC NJM78L05A(T3) 1AE B
IC404 2114 5796 IC / MONOLITHIC NJM78M05FA 1AE B
IC405 2114 1106 IC / HYBRID STK4132MK2 1BL B
IC406, IC408
IC410, IC411 2114 1799 IC / MONOLITHIC M5218APR 4AC B
IC409 2114 1421 IC / PHOTO COUPLER PC900V 1AK B
J401 - J402 3612 0584 JACK YKB21-5012 2AD A
J403 - J404 3612 0789 JACK YKB21-5010 2AC A
J405 3501 4816 JACK / DIN YKF51-5051 1AH B
Q401 - Q404 2254 0551 FET 2SK365-BL(TPE4) 4AC A
36927 5520 PCB ASSY / M425-PS2M M241035*2 DN AFor 110 - 127V area
36927 5530 PCB ASSY / M425-PS2M M241035*3 DN AFor 220 - 240V area
- 17 -

NItem Code No. Part Name Specification QPrice Code RRemarks
PS12,PS3,PS4M PCB's
F401 3632 0294 FUSE / UL TIME-LAG MT4-2A-N1 1AF AFor 110 - 127V area
F401 3631 1037 FUSE / TIME-LAG (S)T-1A 1AE A For 220 - 240V area
NJ406 - J407 3502 2657 JACK / PHONE YKB22-5006 2AF A
L401 3013 2577 COIL / CHOKE PLAC1522R0R01B1 1AM C
NLED401 2370 1417 LED SLP-135B-51 1AA B
46927 5490 PCB ASSY / M425-PS12 M341012*2 1BS B For 110 - 127V area
46927 5500 PCB ASSY / M425-PS12 M341012*3 1BR BFor 220 - 240V area
56927 5540 PCB ASSY / M425-PS3M M341013*1 1CO B
66927 5580 PCB ASSY / M425-PS4M M341014*1 1BJ B
Keyboard PCB's
ND701 - D876 2390 3043 DIODE 1S2076TE 176 AA B
N76927 3270 PCB ASSY / M887T-KY1M M240951*1 1BO C
N86927 3280 PCB ASSY / M887T-KY2M M240952*1 1BT C
N96927 5610 PCB ASSY / M887T-KY3M M241019*1 1BM C
Other electrical parts
N10 3012 1614 TRANSFORMER TE-425-1M1 1CA BFor 110 - 127V area
N10 3012 1615 TRANSFORMER TE-425-2M1 1CA BFor 220 - 240V area
11 3831 1077 SPEAKER SG16G51BFA 2BS B
12 3613 0217 RECEPTACLE NC-174-10-C 1AJ C
Keyboard unit
N13 6927 3230 KY ASSY M140830*1 1EO B
N14 6927 3980 RUBBER / CONTACT AB M240957-1 1AE A
N15 6927 3990 RUBBER / CONTACT CB M240958-1 6AH A
N16 6927 4000 RUBBER / CONTACT CS M240959-1 1AH A
N17 6927 3250 HAMMER ASSY / WHITE KEY M340962*1 52 BF B
N18 6927 3260 HAMMER ASSY / BLACK KEY M340963*1 36 BF B
N19 6927 4030 BLACK KEY M140784-1 36 AG A
N20 6927 4040 WHITE KEY / C M140783-1 7AH A
N21 6927 4050 WHITE KEY / D M140785-1 7AI A
N22 6927 4060 WHITE KEY / E M140786-1 7AH A
N23 6927 4070 WHITE KEY / F M140787-1 7AI A
N24 6927 4080 WHITE KEY / G M140788-1 7AH A
N25 6927 4090 WHITE KEY / A. M140789-1 7AH A
N26 6927 4100 WHITE KEY / B M140790-1 8AI A
N27 6927 4110 WHITE KEY / SA M140792-1 1AM A
N28 6927 4120 WHITE KEY / SC M140791-1 1AN A
Mecanical parts
29 6924 5260 BUTTON / POWER M340318-1 1AA B
30 6919 3241 KNOB /SLIDE M311405-1 2AB B
N31 6927 5730 SWITCH ASSY / POWER M341019*1 1BN B
Stand
N32 6927 5680 PEDAL-BOX M241018*1 1CX B
N33 1004 3475 SCREW SET -415MM M341366C-1 1BL B
AC cord
34 3701 1142 AC cord 5-989660 1AZ C120V, USA
34 3701 0595 AC cord EC-654-E06 1BP C230V, Europe
240V, Other countries
34 3701 1008 AC cord SP22-17022A 1CD C 230V, UK
Notes: N- New parts
Q-Quantity used per unit
R-Rank
- 18 -

— 19 —
SCHEMATIC DIAGRAMS
MAIN PCB JCM425-MA1M
3
45