(with price)
AP-20
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,
Memory:
Number of Songs:
System:
Memory Capacity:
Memory Backup Battery:
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 Impedance: 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)
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
2 (A and B)
Real-time recording
Approximately 3,000 notes total
Built-in lithium battery
Battery Life: Approximately 5 years
Note: There are two models of AP-20, one has a keyboard cover, the other has no keyboard cover.
—3—
BLOCK DIAGRAM
MIDI
IN
OUT
PEDAL
SF
SS
DP
MIDI
P70 ~
P77
P12 ~
P14
Switches
Switch & LED
Controller
µPD65005GF-419 KI0 ~ 3
L1 ~ 9
LA ~ J
D0 ~ 7
RST
A0 ~ 14
MUTE
A0 ~ 3
Reset IC
MB3771P
RD0 ~ 15
DSP
HG51B155FD
AVCC
AVDD
AVFF
VDD
ED0 ~ 15
+12V
Voltage Regulator +5V
M5F78M12L × 2 –12V
M527BL05
+5V
T8, T9
D/A Converter
µPD6376CX
BDK, WOK1, SORM, SORP
D/A Converter
µPD6376CX
Filter
Filter
Main
Volume
LINE IN
Mixer, Mute Circuit
T6, T7, T10, T11
Power Amp.
STK4132MK
—4—
ROM
8M + 16M
HN62418PD25
HN624116D44
EA0 ~ 14
ROM
1M
MX23C1010PC12CA25
SOLM, SOLP
LEDs
RA0 ~ 19
RAM
256K
HM62256BLP-10
Power Transformer
FI0 ~ 10
SI0 ~ 10
KC0 ~ 4
Controller
HG52E35P
MIDO
CPU
HD6435328RC13F
T101
Keyboard
Keyboard
BRILLIANCE
Power Switch
KC0 ~ 7
RAM
256K × 2
HM65256BLSP10 × 2
PCB LAYOUT
MA2M
PS1
MA1M
IF1M
HALL 2
VOLUME
CONTROL
ON
OFF
MIN
POWER
MAX
MELLOW
LOWER TONE
TONE
BRILLIANCE
CN2M
BRIGHT
PIANO 1
PIANO 2
E.PIANO
HARPSICHORD VIBRAPHONE PIPE ORGAN
STRINGS
CHOIR
REVERB
CN1M
W.BASS
E.BASS
TUNE
MEMORY
HALL 1
TREMOLO
STAGE
CHORUS
SONG A
SONG B
ROOM
RECORD
START/
STOP
DEMO
CN3M
TP10-KY1M
TP10-KY2M
MA4M MA5M
Note: IF1M PCB is a terminal board for the keyboard PCBs, and included in the main PCB.
PCB
JCM433-
Components
Main PCB
MA1M
CPU, DSP, Sound Source ROM Working storage
RAM, Effect RAM Reset IC, DAC, Filter, Key controller, Power amp, Power supply circuit
Jack PCBs
MA2M
LINE IN/OUT jack, MIDI jacks
MA4M
Phone jacks
MA5M
Power indicator
CN1M
Gate array (Button controller/LED driver), LEDs,
Buttons
CN2M
Main Volume, Brilliance volume
CN3M
Tune Buttons, Demo button
PS1
Fuse, Noise filter
Console PCBs
Power PCB
—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—
CIRCUIT DESCRIPTION
KEYMATRIX
Second contact
First contact
FI
KC
SI
LSI
UPD912GF-3BA
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
— 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
AVCC
+12 V
Filter, Mixer
AVFF
-12 V
Filter, Mixer
— 11 —
MAJOR WAVEFORMS
A 20 µs
A 1ms
3
CH1
4
CH2
5
CH3
CH1
1
CH2
2
CH1 .2V˜
CH1 5V˜
CH2 .2V˜
1 Filter output L-ch
2 Filter output R-ch
3 Key scan signal KC0
4 Key scan signal KC1
5 Key scan signal KC2
CC connector pin 1
CC connector pin 2
Tone : Piano 1
Key : A4
A 2ms
6
CH1
7
CH2
8
CH3
CH1 5V
CH2 5V
CH2 5V
6 Button scan signal KC0
7 Button scan signal KC1
8 Button scan signal KC2
CH2 5V
UPD65005GF-419 pin 53
UPD65005GF-419 pin 54
UPD65005GF-419 pin 55
— 12 —
CH3 5V
JA connector pin 5
JA connector pin 4
JA connector pin 3
TROUBLESHOOTING
1.
No power
Check fuse F101.
Yes
Is F101 blown up?
No
Replace F101.
Check fuses F2, F3, and F4.
Are the fuses blown up?
Yes
No
Replace F2, F3, and F4.
Measure output voltages of
the transformer.
Yes
Replace main PCB.
Are the voltages 40 V AC
and 8 V AC?
No
Check the power switch.
Is it OK?
No
Yes
Replace the power switch.
Check position of voltage
selector.
Is it OK?
Yes
Replace the transformer.
— 13 —
No
Set the voltage selector at
proper position.
2.
No sound
Does the power indicator
light up?
No
Follow "No power"
troubleshooting.
Yes
Check the main volume.
Is it OK?
No
Yes
Disconnect JA and JB
connectors on the main PCB.
Replace main volume.
Press Demo button.
Does the demo tune sound?
No
Replace the main PCB.
Yes
Replace keyboard PCBs.
3.
Distorted sound
Check the voltage selector.
Is it at proper position?
Yes
Replace the main PCB.
— 14 —
No
Set the voltage selector at
proper position.
4.
Certain keys do not function
Replace the main PCB.
Do the keys function?
Yes
No
Replace keyboard PCBs.
5.
End
A certain key does not function
Clean the contact.
Does the key function?
Yes
No
Replace the key contact rubber.
Does the key function?
Yes
No
Replace keyboard PCBs.
Does the key function?
Yes
No
Replace the main PCB.
— 15 —
End
6.
A certain button does not function
Replace the console PCBs.
Does the button function?
Yes
No
Replace MA1M PCB.
— 16 —
End
WIRING DIAGRAM
LINE IN LINE OUT
MIDI
R L R L
IN OUT THRU
JCM433-MA2M
JCM433-PS1
CR-1
CR-2
CR-3
+
–
NC
CS-1
CS-2
CS-3
SI10
FI10
SI9
FI9
SI8
FI8
SI7
FI7
SI6
FI6
SI5
FI5
KC7
KC6
KC5
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
Pedal Unit
JCM433-MA4M
— 17 —
PHONES
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
SI0
KC0
FI0
KC1
SI1
KC2
FI1
KC3
SI2
KC4
FI2
KC5
SI3
KC6
FI3
KC7
SI4
NC
FI4
NC
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
SI5
KC0
FI5
KC1
SI6
KC2
FI6
KC3
SI7
KC4
FI7
KC5
SI8
KC6
FI8
KC7
SI9
FI10
FI9
SI10
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
1
2
3
4
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
TP8/10 KY1
KC7
NC
FI4
SI4
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
CT-1
CT-2
CT-3
CT-4
CT-5
CT-6
CT-7
CT-8
CT-9
+
–
NC
CD-1
CD-2
CD-3
CD-4
CU-1
CU-2
CU-3
CU-4
CU-5
GR
KC4
KC3
KC2
KC1
KC0
SI4
FI4
SI3
FI3
SI2
FI2
SI1
FI1
SI0
FI0
CT-1
CT-2
CT-3
CT-4
CT-5
CT-6
CT-7
CT-8
CT-9
C-1
C-2
Voltage Selector
GY
BK
PP
BR
O
GR
CE-1
CE-2
CE-3
CE-4
CE-5
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
SF
SS
DP
AVDDP
CV-1
CV-2
CV-3
CV-4
NC
BK
Y
BL
W
R
CV-1
CV-2
CV-3
CV-4
Power Transformer
TVOL
TVOR
AG
TVRL
TVRR
SOFT
SOSTE
DAMP
COMMON
JX-1
JX-2
JX-3
JX-4
JX-5
JCM433-CN2M
CE-BR
CE-R
CE-E
CE-O
CE-Y
JCM433-IF1M
1
2
3
4
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
MID0
MID1
VDD
DG
AG
FG
AG
AVFF
AVCC
LIR
AG
LIL
LOR
AG
LOL
JCM433-MA1M
KI0
KC4
AVDDB
BRILLIANCE
AGB
JX-1
JX-2
JX-3
JX-4
JX-5
JCM433-CN1M
CF-1
AGB CF-1
CF-2 BRILLIANCE CF-2
CF-3 AVDDB CF-3
DB0 CF-4
CF-4
DB1 CF-5
CF-5
DB2 CF-6
CF-6
DB3 CF-7
CF-7
A0
CF-8
CF-8
A1
CF-9
CF-9
A2
CF-10
CF-10
CE
CF-11
CF-11
CF-12 NRD
CF-12
CF-13 NWR CF-13
CF-14 NRES CF-14
CF-15
CF-15
CF-16
CF-16
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
JY-1
JY-2
JY-3
JY-4
JY-1
JY-2
JY-3
JY-4
KC4
KI3
KI2
KI1
JCM433-CN3M
TP8/10 KY2
EXPLODED VIEW
STAND
R-8
X
R-9
R-10
x4
R-11
R-12
W
— 18 —
x4
x4
x1
x12
x2
x4
x4
R-1
R-2
R-4
R-5
32
30
26
R-3
3
31
8
5
26
2
1
— 19 —
29
R-7
R-6
6
27
7
9
18
28
23
4
22
19
21
20
25
18
10
17
16
15
14
17
11
12
13
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.
N
Item
N
N
N
N
1
2
3
N
4
N
N
5
Code No.
Parts Name
Main PCB
2200 4409 Transistor
2220 1387 Transistor
2240 1050 FET
2360 0273 Zener diode
2360 1694 Zener diode
2011 0455 LSI, RAM
2011 3325 LSI, DAC
2011 5194 LSI, Key controller
2011 5208 LSI, ROM, Sound source
2011 5222 LSI, CPU
2011 5236 LSI, ROM, Sound source
2011 7434 LSI, DSP
2012 0560 LSI, RAM
2012 2093 LSI, ROM
2101 0731 IC, NADD gate
2105 1092 IC, NOT gate
2114 0021 IC, OP-amp.
2114 0140 IC, Reset
2114 0854 IC, Regulator
2114 1106 IC, Hybrid, Power amp.
2114 1113 IC, Regulator
2114 2163 IC, Regulator
2230 5229 Transistor
2390 2366 Diode stack
2529 2034 Ceramic oscillator
2590 1519 Crystal oscillator
3815 0707 Lithium battery
3631 1070 Fuse, Time-lag
3631 1045 Fuse, Time-lag
3632 0231 Fuse, Time-lag
3632 0273 Fuse, Time-lag
6924 7790 Main PCB ass'y M433-MA1M
Sub PCB
2105 1092 IC, NOT gate
2114 0021 IC, OP-amp.
2114 1421 IC, Photocoupler
3501 4802 DIN jack
3612 0789 Jack, Line IN/OUT
6924 4670 Sub PCB ass'y M433-MA2M
Console PCB
2370 0630 LED
3412 0903 Tact switch
2011 0812 LSI, Gate array, LED driver
2765 0280 Slide volume
2765 1288 Slide volume
6924 4760 Console PCB ass'y M433CN-123M
Jack PCB
2320 9748 LED
3613 1533 Jack, Phone
6924 4690 M433MA4,5M-PCBASSY
Power PCB
3632 0287 Fuse, Time-lag
3632 0280 Fuse, Time-lag
6924 7810 Power PCB M433-PS1
Notes: N – New parts
R – Rank
— 21 —
Specification
Q
FOB Japan
N.R.Yen
R
Unit Price
2SA933-SQ-TP-T
2SC1740SQ-TP-T
2SK163N-T
RD3.3ESB1-T1-T
RD6.2ESB1-T1-T
HM65256BLSP-10
UPD6376CX
HG52E35P
HN624116PD44
HD6435328RC13F
HN62418PD25
HG51B155FD
HM62256BLP-10.8
MX23C1010PC-12CA25
TC74HC10AP
TC74HC04AP
LA6462D
MB3771P
M5278L05
STK4132MK2
M5F78M12L
M5F79M12L
2SD1666R,S
S4VB20-4033(L10)
CSA20.00MX040
HC-49U16384
CR2032-1HM
(S)T-3.15A
(S)T-1.6A
UL-TSC-3.15A-N1
UL-TSC-1.6A-N1
M140334*2
3
2
4
1
1
2
2
1
1
1
1
1
1
1
1
1
5
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
8
8
31
8
8
450
190
540
1,260
1,260
870
1,160
600
290
32
30
39
90
78
650
91
78
60
190
52
100
96
39
62
61
61
14,470
B
B
B
B
A
A
A
A
A
A
A
A
A
A
B
B
B
B
A
A
A
A
A
B
B
B
B
A
A
A
A
A
TC74HC04AP
LA6462D
PC900V
YKF51-5052
YKB21-5010
M240332*1
1
1
1
1
4
1
30
39
100
120
35
2,170
B
B
B
B
A
A
LN282RPX-(TX3)
EVQ-21405R
UPD65005GF-419
EWA-NAXCH1B14
EWA-NAXCH1B54
M140336*1
19
20
1
1
1
1
21
14
220
100
100
2,150
B
A
B
A
A
A
LN28RPH
HLJ4336-01-3040
M240334*1
1
1
1
20
170
900
B
A
B
(S)T-0.63A
MT4-1.6A-N1
M240333*2
1
1
1
49
64
890
A
A
C
N
Item
N
6
7
8
N
N
N
N
N
N
N
N
N
9
10 - 16
19
20
21
22
23
24
25
26
27
N
28
29
30
31
32
N
33
34
N
Code No.
Parts Name
Other electrical parts
3012 0567 Transformer
3613 0217 Receptacle
3412 1827 Power switch
Keyboard unit
6924 1820 Keyboard unit
6924 9150 White key set, 1-octave
6924 9150 Black key, 1-octave
6924 9160 Spring, for white key
6924 9170 Spring, for black key
6924 9190 Contact, rubber, for key, 12
6924 9200 Contact, rubber, for key, 13
6924 9060 Keyboard PCB (DX)
6924 9070 Keyboard PCB (SX)
Mechnical parts
3831 0546 Speaker
6906 6141 Felt for keyboard
6919 7410 Sponge for felt
6924 5390 Rack L
6924 5410 Rack R
6919 3241 Slide knob A 353
6924 5260 Button, power switch
6924 5600 Button set 433
Stand
6924 7050 Pedal box ass'y
6924 7060 Screw set for AP-20's stand
AC cord
3701 0196 AC cord (120V, USA)
3701 0595 AC cord (230V, Europe)
3701 0588 AC cord (230V, UK)
3701 0553 AC cord (240V, Australia)
Notes:
N – New parts
R – Rank
— 22 —
Specification
TE-351-1M1
NC-174-10-C
SDDLD1-A2-D
Q
FOB Japan
N.R.Yen
R
Unit Price
1
1
1
2,040
110
130
B
B
A
1
7
7
52
36
6
1
1
1
13,340
540
540
15
15
150
160
2,800
3,500
B
A
A
B
B
A
A
C
C
EAS-16PL465A
M410324A-4
M411750-1
1037153000
1037154009
M311405A-1
M340318-1
M240304*1
2
1
8
1
1
2
1
1
1,250
140
19
170
170
17
13
170
B
B
B
B
B
B
B
B
A190007400
A190007500
1
1
5,120
600
B
B
UC-964-J01
EC-654-E06
BC-323-J01
SC-101-J02
1
1
1
1
650
720
860
660
B
B
B
B
88TP/10CASIO
88TP10(42120120)
88TP10(42120030)
88TP10(23100820)
88TP10(23100810)
88TP10/8(2564230)
88TP10/8(2564240)
88TP10/8(42912070)
88TP10/8(42912080)
SCHEMATIC DIAGRAMS
MAIN PCB JCM433-MA1M (1/2)
ROM (8M)
D/A Converter
DSP
D/A Converter
ROM (16M)
RAM
(256K)
CPU
ROM
(1M)
RAM
(256K)
RAM
(256K)
3
Reset IC
Key Controller
— 23 —
4
5
MAIN PCB JCM433-MA1M (2/2), PHONE JACK PCBs JCM433-MA4M, MA5M and POWER PCBs JCM433-PS1
Power Amp.
Filter
40V AC
1
2
40V AC
Power Circuit
8V AC
8V AC
— 24 —
CONSOLE PCBs JCM433-CN1M, 2M, 3M, and JACK PCB JCM433-MA2M
7
Switch & LED Controller
6
8
— 25 —
INTERFACE PCB JCM433-IF1M
— 26 —
KEYBOARD PCB TP8/10 KY-1
— 27 —
KEYBOARD PCB TP8/10 KY-2
— 28 —
MA0100661A