AP-20
(with price)
ELECTRONIC KEYBOARD
CONTENTS
Safety Notice...................................................................................... 2
Specifications .................................................................................... 3
Block Diagram ................................................................................... 4
PCB Layout ........................................................................................ 5
Disassembly Instructions ................................................................. 6
Circuit Description .......................................................................... 10
Major Waveforms.............................................................................12
Troubleshooting .............................................................................. 13
Wiring Diagram ................................................................................ 17
Exploded View ................................................................................. 18
Parts List .......................................................................................... 21
Schematic Diagrams ....................................................................... 23
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: 10, PIANO 1, PIANO 2, ELEC. PIANO, HARPSICHORD, VIBRAPHONE,
PIPE ORGAN, STRINGS, CHOIR, W.BASS (Lower tone only),
E.BASS (Lower tone only)
Layer/Split function
Key transpose: F#-C-F
Keyboard controls: Tuning curve, Baroque pitch
Temperaments: Equal Temperament, Kirnberger III, Werckmeister, Mean-Tone,
Just Intonation (Minor/Major), Pythagorean System
Effects: Reverb (Room, Stage, Hall 1, Hall 2)/Chorus/Tremolo/Brilliance
Demo tunes: 8, 1. Polonaise "Héroïque" (F.F. Chopin)
2. Frühlingslied Op. 62-6 (F. Mendelssohn)
3. CASIO original
4. Harmonious blacksmith (G.F. Händel)
5. CASIO original
6. Jesus, Bleibet Meine Freude (J.S. Bach)
7. CASIO original
8. CASIO original
Memory: Number of Songs: 2 (A and B)
System: Real-time recording
Memory Capacity: Approximately 3,000 notes total
Memory Backup Battery: Built-in lithium battery
Battery Life: Approximately 5 years
Pedals: Soft, Sostenuto, Damper
Tuning control: 440Hz ±50 cents
Built-In Speakers: 16 cm dia. x 2 (Output: approx. 20 W + 20 W)
MIDI: 16-channel, multi-timbral reception
Terminals: PHONES 1 and 2, MIDI (IN/OUT/THRU), LINE OUT L and R (Output Imped-
ance: 10 KΩ; Output Voltage: 2 V, RMS, max.), LINE IN R and L (Input Impedance: 20 KΩ, Input sensitivity: 200 mV)
Power source: 120V (for U.S.A.),
120V, 220V, 230V and 240V (for other countries)
Power consumption: 65W (with 120V AC), 55W (with 220V, 230V and 240V AC)
Dimensions (HWD): Without stand: 185 × 1340 × 520 mm (7-5/16 × 52-13/16 × 20-1/2 inches)
With stand: 820 × 1360 × 550 mm (32-5/16 × 53-9/16 × 21-11/16 inches)
Weight: Without stand: 35.5 kg (78.3 lbs)/38.5 kg (84.0 lbs)
With stand: 45.5 kg (100.4 lbs)/48.5 kg (106.1 lbs)
Note: There are two models of AP-20, one has a keyboard cover, the other has no keyboard cover.
— 3 —
BLOCK DIAGRAM
RAM
256K
HM62256BLP-10
ROM
1M
MX23C1010PC-
12CA25
BRILLIANCE
D0 ~ 7
A0 ~ 14
PEDAL
SF
SS
DP
CPU
HD6435328RC13F
HG51B155FD
MIDI
IN OUT
MIDI MIDO
A0 ~ 3
DSP
P70 ~
P77
MUTE
Keyboard
Controller
HG52E35P
P12 ~
P14
Switch & LED
Controller
µPD65005GF-419
RST
Reset IC
MB3771P
RA0 ~ 19
RD0 ~ 15
EA0 ~ 14
ED0 ~ 15
KC0 ~ 7
FI0 ~ 10
SI0 ~ 10
KC0 ~ 4
KI0 ~ 3
L1 ~ 9
LA ~ J
HN62418PD25
HN624116D44
HM65256BLSP 10 × 2
Keyboard
Switches
LEDs
ROM
8M + 16M
RAM
256K × 2
AVCC
AVDD
AVFF
+12V
+5V
–12V
M527BL05
M5F78M12L × 2
Voltage Regulator
T101
Power Switch
VDD
+5V
T8, T9
LINE IN
Power Transformer
SOLM, SOLP
D/A Converter
µPD6376CX
Filter
Main
Volume
BDK, WOK1, SORM, SORP
D/A Converter
µPD6376CX
Filter
Mixer, Mute Circuit
T6, T7, T10, T11
Power Amp.
STK4132MK
— 4 —
PCB LAYOUT
MA2M
PS1
MA1M
IF1M
HALL 2
REVERB
VOLUME
CONTROL
ON
OFF
POWER
MIN MAX
BRILLIANCE
MELLOW BRIGHT
CN2M CN1M
TONE
PIANO 2 E.PIANO HARPSICHORD PIPE ORGAN STRINGS CHOIRVIBRAPHONE W.BASS E.BASS
PIANO 1
LOWER TONE
HALL 1
TREMOLO
STAGE
CHORUS
SONG A
ROOM
SONG B RECORD
TUNE DEMO
MEMORY
START/
STOP
CN3M
TP10-KY1M TP10-KY2M
MA4M MA5M
Note: IF1M PCB is a terminal board for the keyboard PCBs, and included in the main PCB.
Main PCB
Jack PCBs
PCB
MA1M
MA2M
JCM433-
Components
CPU, DSP, Sound Source ROM Working storage
RAM, Effect RAM Reset IC, DAC, Filter, Key controller, Power amp, Power supply circuit
LINE IN/OUT jack, MIDI jacks
Console PCBs
Power PCB
MA4M
MA5M
CN1M
CN2M
CN3M
PS1
Phone jacks
Power indicator
Gate array (Button controller/LED driver), LEDs,
Buttons
Main Volume, Brilliance volume
Tune Buttons, Demo button
Fuse, Noise filter
— 5 —
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.
For keyboard-cover model
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.
For no-keyboard-cover model
2. Disassembling the front cover
2-1. Remove 4 screws at both ends of the front cover.
2-2. Remove the front cover.
— 6 —
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.
3-1. The console panel is fixed with screws and nuts. Holding the
nut, remove the screw.
3-2. Remove the screw fixing a grounding wire at the transformer.
3-3. Slide the console panel towards the front to free from catches.
3-4. Turn round the console panel.
3-5. Remove the 2 screws fixing the power switch.
Insert paper here.
Insert paper here.
4. Disassembling front cover
4-1. Remove 5 screws at the front edge on the bottom.
4-2. Disconnect the connector for phone jacks from the main PCB.
4-3. Watching the phone-jack cable, pull out the front cover towards the front.
— 7 —
5. Disassembling keyboard unit
5-1. Remove 6 screws at both ends on the bottom, and a screw at the middle.
5-2. Remove 2 screws at both ends of keyboard unit.
5-3. Disconnect 2 connectors for the keyboard unit from the main PCB.
5-4. Moving the keyboard unit towards the front, remove the unit from the case.
6. Disassembling keys
6-1. Peel the red felt and sponges off the keyboard unit.
6-2. Using a long-nose plier, remove key springs.
6-3. Pressing the hook with a long-nose plier. Lift the key.
— 8 —
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 remove the jumper
before replacing the PCB. And make sure that the jumper is reset on new main PCB after
replacing the PCB. Because no jumper is set on a spare part of the main PCB.
Jumper
— 9 —
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
LSI
UPD912GF-3BA
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
— 10 —
BUTTON MATRIX
KI0 KI1 KI2 KI3
KO0 Piano2 E. Piano Harpsichord W. Bass
KO1 Piano1 Strings Choir E. Bass
KO2 Vibraphone Pipe organ Reverb
KO3 Song A Song B Record Start/Stop
KO4 Control Tune up Tune down Demo
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
AVDD +5 V DAC
A VCC +12 V Filter, Mixer
AVFF -12 V Filter, Mixer
— 11 —
MAJOR WAVEFORMS
A 1ms
1
2
˜˜
CH1 .2V CH2 .2V
1 Filter output L-ch CC connector pin 1
2 Filter output R-ch CC connector pin 2
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 JA connector pin 5
4 Key scan signal KC1 JA connector pin 4
5 Key scan signal KC2 JA connector pin 3
CH1
CH2
CH3
7
8
CH1 5V CH2 5V
CH2 5V
6 Button scan signal KC0 UPD65005GF-419 pin 53
7 Button scan signal KC1 UPD65005GF-419 pin 54
8 Button scan signal KC2 UPD65005GF-419 pin 55
CH2
CH3
— 12 —
1. No power
TROUBLESHOOTING
Check fuse F101.
Is F101 blown up?
No
Check fuses F2, F3, and F4.
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 F101.
Yes
Replace F2, F3, and F4.
Is it OK?
Yes
Check position of voltage
selector.
Is it OK?
Yes
Replace the transformer.
— 13 —
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 JA and JB
connectors on the main PCB.
Press Demo button.
Does the demo tune sound?
No
Follow "No power"
troubleshooting.
No
Replace main volume.
No
3. Distorted sound
Yes
Replace keyboard PCBs.
Check the voltage selector.
Is it at proper position?
Yes
Replace the main PCB.
Replace the main PCB.
No
Set the voltage selector at
proper position.
— 14 —
4. Certain keys do not function
Replace the main PCB.
Do the keys function?
Replace keyboard PCBs.
5. A certain key does not function
Clean the contact.
Does the key function?
Replace the key contact rubber.
Does the key function?
Yes
No
End
Yes
No
Yes
No
Replace keyboard PCBs.
Does the key function?
No
Replace the main PCB.
Yes
End
— 15 —
6. A certain button does not function
Replace the console PCBs.
Does the button function?
No
Replace MA1M PCB.
Yes
End
— 16 —
WIRING DIAGRAM
JCM433-CN3M
JY-1
JY-2
JY-3
KI3
KI2
KC4
JY-1
JY-2
JY-3
JCM433-CN1M
JX-1
JX-2
JX-3
JX-4
KI0
KC4
AVDDB
BRILLIANCE
JX-1
JX-2
JX-3
JX-4
JCM433-CN2M
Power Transformer
CV-1
CV-2
CV-3
Y
W
BL
BK
NC
C-1
CV-1
Voltage Selector
C-2
CV-2
CV-3
JCM433-PS1
JY-4
KI1
JY-4
JX-5
AGB
JX-5
CV-4
R
CV-4
AGB
CF-1
BRILLIANCE
CF-2
AVDDB
CF-3
CF-4
CF-5
CF-6
CF-7
CF-8
CF-9
CF-10
CF-11
NRD
CF-12
NWR
CF-13
NRES
CF-14
CF-15
CF-16
TVOL
CE-BR
TVOR
CE-R
CE-E
TVRL
CE-O
TVRR
CE-Y
GY
BK
PP
BR
O
GR
DB0
DB1
DB2
DB3
A0
A1
A2
CE
AG
NC
NC
LINE IN
RLRL IN
LINE OUT MIDI
OUT THRU
JCM433-MA2M
CC-1
CC-2
CC-3
CC-4
CC-5
CC-6
CC-7
CC-8
CC-9
CC-10
CC-11
CC-12
CC-13
CC-14
CC-15
AGFGAG
DG
VDD
MID0
CF-1
CF-2
CF-3
CF-4
CF-5
CF-6
CF-7
CF-8
CF-9
CF-10
CF-11
CF-12
CF-13
CF-14
CF-15
CF-16
MID1
CC-1
CC-2
CC-3
CC-4
CC-5
CC-6
AVFF
CC-7
CC-8
JCM433-MA1M
CE-1
CE-2
CE-3
CE-4
CE-5
CU-1
CU-2
CU-3
CU-4
CU-5
GR
CR-1
+
CR-2
–
CR-3
CS-1
+
CS-2
–
CS-3
CD-1
CD-2
SF
SS
CD-3
CD-4
DP
AVDDP
CT-1
LIR
AVCC
CC-9
CC-10
CT-2
CT-3
LIL
AG
CC-11
CC-12
CT-4
CT-5
AG
LOR
CC-13
CC-14
CT-6
CT-7
LOL
JA-1
CC-15
JA-2
JA-3
JA-4
JA-5
JA-6
JA-7
JA-8
JA-9
JA-10
JA-11
JA-12
JA-13
JA-14
JA-15
JB-1
JB-2
JB-3
JB-4
JB-5
JB-6
JB-7
JB-8
JB-9
JB-10
JB-11
JB-12
JB-13
JB-14
JB-15
CT-8
CT-9
JCM433-IF1M TP8/10 KY1
KC4
KC3
KC2
KC1
KC0
SI4
FI4
SI3
FI3
SI2
FI2
SI1
FI1
SI0
FI0
SI10
FI10
SI9
FI9
SI8
FI8
SI7
FI7
SI6
FI6
SI5
FI5
KC7
KC6
KC5
JA-1
JA-2
JA-3
JA-4
JA-5
JA-6
JA-7
JA-8
JA-9
JA-10
JA-11
JA-12
JA-13
JA-14
JA-15
JB-1
JB-2
JB-3
JB-4
JB-5
JB-6
JB-7
JB-8
JB-9
JB-10
JB-11
JB-12
JB-13
JB-14
JB-15
CA-1
CA-2
CA-3
CA-4
CA-5
CA-6
CA-7
CA-8
CA-9
CA-10
CA-11
CA-12
CA-13
CA-14
CA-15
CA-16
CA-17
CA-18
CA-19
CA-20
CB-1
CB-2
CB-3
CB-4
CB-5
CB-6
CB-7
CB-8
CB-9
CB-10
CB-11
CB-12
CB-13
CB-14
CB-15
CB-16
CB-17
CB-18
CB-19
CB-20
SI0
KC0
FI0
KC1
SI1
KC2
FI1
KC3
SI2
KC4
FI2
KC5
SI3
KC6
FI3
KC7
SI4
NC
FI4
NC
SI5
KC0
FI5
KC1
SI6
KC2
FI6
KC3
SI7
KC4
FI7
KC5
SI8
KC6
FI8
KC7
SI9
FI10
FI9
SI10
CA-1
CA-2
CA-3
CA-4
CA-5
CA-6
CA-7
CA-8
CA-9
CA-10
CA-11
CA-12
CA-13
CA-14
CA-15
CA-16
CA-17
CA-18
CA-19
CA-20
CB-1
CB-2
CB-3
CB-4
CB-5
CB-6
CB-7
CB-8
CB-9
CB-10
CB-11
CB-12
CB-13
CB-14
CB-15
CB-16
CB-17
CB-18
CB-19
CB-20
123
NC
KC7
123
FI4
4
SI4
4
SOFT
SOSTE
DAMP
Pedal Unit
CT-1
COMMON
CT-2
JCM433-MA4M
— 17 —
CT-3
CT-4
CT-5
CT-6
CT-7
CT-8
CT-9
PHONES
TP8/10 KY2
STAND
EXPLODED VIEW
R-11
R-8 R-9
R-12
R-10
W
X
x4
x4
x4
x1
x12
x2
x4
x4
— 18 —
R-1
R-2
R-3
31
R-4
R-5
32
30
26
3
8
— 19 —
7
28
26
5
1
2
29
R-7
6
R-6
27
9
18
20
19
21
11 13
23
4
22
18
10
17
25
16
15
14
1217
24
PARTS LIST
AP-20
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.
FOB Japan
N Item Code No. Parts Name Specification Q N.R.Yen R
Unit Price
Main PCB
2200 4409 Transistor 2SA933-SQ-TP-T 3 8 B
2220 1387 Transistor 2SC1740SQ-TP-T 2 8 B
2240 1050 FET 2SK163N-T 4 31 B
2360 0273 Zener diode RD3.3ESB1-T1-T 1 8 B
2360 1694 Zener diode RD6.2ESB1-T1-T 1 8 A
2011 0455 LSI, RAM HM65256BLSP-10 2 450 A
2011 3325 LSI, DAC UPD6376CX 2 190 A
2011 5194 LSI, Key controller HG52E35P 1 540 A
2011 5208 LSI, ROM, Sound source HN624116PD44 1 1,260 A
2011 5222 LSI, CPU HD6435328RC13F 1 1,260 A
2011 5236 LSI, ROM, Sound source HN62418PD25 1 870 A
2011 7434 LSI, DSP HG51B155FD
N
N1
N2
N3
N 3613 1533 Jack, Phone HLJ4336-01-3040 1 170 A
4 6924 4690 M433MA4,5M-PCBASSY M240334*1 1 900 B
N
N
5
2012 0560 LSI, RAM HM62256BLP-10.8
2012 2093 LSI, ROM MX23C1010PC-12CA25 1 290 A
2101 0731
2105 1092 IC, NOT gate TC74HC04AP
2114 0021
2114 0140 IC, Reset MB3771P
2114 0854 IC, Regulator M5278L05 1 78 A
2114 1106
2114 1113 IC, Regulator M5F78M12L
2114 2163 IC, Regulator M5F79M12L 1 78 A
2230 5229
2390 2366 Diode stack S4VB20-4033(L10) 1 190 B
2529 2034 Ceramic oscillator CSA20.00MX040
2590 1519 Crystal oscillator HC-49U16384 1 100 B
3815 0707 Lithium battery CR2032-1HM
3631 1070 Fuse, Time-lag (S)T-3.15A
3631 1045 Fuse, Time-lag (S)T-1.6A
3632 0231 Fuse, Time-lag UL-TSC-3.15A-N1
3632 0273 Fuse, Time-lag UL-TSC-1.6A-N1
6924 7790 Main PCB ass'y M433-MA1M M140334*2
Sub PCB
2105 1092 IC, NOT gate TC74HC04AP
2114 0021 IC, OP-amp. LA6462D
2114 1421 IC, Photocoupler PC900V
3501 4802 DIN jack YKF51-5052
3612 0789 Jack, Line IN/OUT YKB21-5010
6924 4670 Sub PCB ass'y M433-MA2M M240332*1
Console PCB
2370 0630 LED LN282RPX-(TX3)
3412 0903 Tact switch EVQ-21405R
2011 0812 LSI, Gate array, LED driver UPD65005GF-419
2765 0280 Slide volume EWA-NAXCH1B14
2765 1288 Slide volume EWA-NAXCH1B54
6924 4760 Console PCB ass'y M433CN-123M M140336*1
Jack PCB
2320 9748 LED LN28RPH 1 20 B
Power PCB
3632 0287 Fuse, Time-lag (S)T-0.63A 1 49 A
3632 0280 Fuse, Time-lag MT4-1.6A-N1 1 64 A
6924 7810 Power PCB M433-PS1 M240333*2
Notes: N – New parts
IC, NADD gate
IC, OP-amp.
IC, Hybrid, Power amp.
Transistor
R – Rank
TC74HC10AP 1 32 B
LA6462D 5 39 B
STK4132MK2 1 650 A
2SD1666R,S 1 60 A
— 21 —
1 1,160 A
1 600 A
130B
190B
191A
152B
196B
139A
162A
161A
161A
1 14,470 A
130B
139B
1 100 B
1 120 B
435A
1 2,170 A
19 21 B
20 14 A
1 220 B
1 100 A
1 100 A
1 2,150 A
1 890 C
FOB Japan
N Item Code No. Parts Name Specification Q N.R.Yen R
Unit Price
Other electrical parts
6
7
N
8
3012 0567 Transformer TE-351-1M1
3613 0217 Receptacle NC-174-10-C
3412 1827 Power switch SDDLD1-A2-D
1 2,040 B
1 110 B
1 130 A
Keyboard unit
N 9 6924 1820 Keyboard unit 88TP/10CASIO
N 10 - 16 6924 9150
N 19 6924 9150
N 20 6924 9160
N 21 6924 9170
N 22 6924 9190
N 23 6924 9200
N 24 6924 9060
N 25 6924 9070
White key set, 1-octave
Black key, 1-octave
Spring, for white key
Spring, for black key
Contact, rubber, for key, 12
Contact, rubber, for key, 13
Keyboard PCB (DX)
Keyboard PCB (SX)
88TP10(42120120)
88TP10(42120030)
88TP10(23100820)
88TP10(23100810)
88TP10/8(2564230)
88TP10/8(2564240)
88TP10/8(42912070)
88TP10/8(42912080)
1 13,340 B
7 540 A
7 540 A
52 15 B
36 15 B
6 150 A
1 160 A
1 2,800 C
1 3,500 C
Mechnical parts
26 3831 0546 Speaker EAS-16PL465A
27 6906 6141
Felt for keyboard
M410324A-4
6919 7410 Sponge for felt M411750-1
28 6924 5390
Rack L
1037153000
29 6924 5410 Rack R 1037154009
30 6919 3241 Slide knob A 353 M311405A-1
2 1,250 B
1 140 B
819B
1 170 B
1 170 B
217B
31 6924 5260 Button, power switch M340318-1 1 13 B
N 32 6924 5600 Button set 433 M240304*1
1 170 B
Stand
33
N34
6924 7050 Pedal box ass'y A190007400
6924 7060 Screw set for AP-20's stand A190007500
1 5,120 B
1 600 B
AC cord
3701 0196 AC cord (120V, USA) UC-964-J01
3701 0595 AC cord (230V, Europe) EC-654-E06
3701 0588 AC cord (230V, UK) BC-323-J01
N
3701 0553 AC cord (240V, Australia) SC-101-J02
1 650 B
1 720 B
1 860 B
1 660 B
Notes: N – New parts
R – Rank
— 22 —
MAIN PCB JCM433-MA1M (1/2)
SCHEMATIC DIAGRAMS
ROM (8M)
D/A Converter
DSP
D/A Converter
ROM (16M)
CPU
Reset IC
RAM
(256K)
Key Controller
ROM
(1M)
RAM
(256K)
RAM
(256K)
4
3
5
— 23 —
MAIN PCB JCM433-MA1M (2/2), PHONE JACK PCBs JCM433-MA4M, MA5M and POWER PCBs JCM433-PS1
Power Amp.
40V AC
8V AC
8V AC
40V AC
Filter
1
2
Power Circuit
— 24 —
7
6
8
CONSOLE PCBs JCM433-CN1M, 2M, 3M, and JACK PCB JCM433-MA2M
Switch & LED Controller
— 25 —
INTERFACE PCB JCM433-IF1M
— 26 —
KEYBOARD PCB TP8/10 KY-1
— 27 —
KEYBOARD PCB TP8/10 KY-2
— 28 —
MA0100661A
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