CASIO AP10 Service Manual
AP-10
(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: 24-note
Preset tones: 5, Piano-1, Piano-2, Electric Piano, Pipe Organ, Strings
Layer: On/Off
Key transpose: Range of ± 1 octave by a semitone increment
Effects: Reverb-1/Reverb-2/Chorus reverb
Demo tunes: 5, 1. Grande valse brillante (F.F. Chopin)
2. One-Eighty (CASIO original)
3. Harmonious blacksmith (G.F. Handel)
4. Fugue in G minor (J.S. Bach)
5. Rainbow (CASIO original)
Memory: Number of songs: 2
System: Real-time recording
Memory capacity: Approx. 1200 notes total
Memory backup battery: Built-in lithium battery
Battery life: Approx. 5 years
Pedals: Damper, Soft/Sostenuto
Tuning control: 440Hz ± 50 cents
Built-In Speakers: 14 cm dia. 10 W input rating: 2 pcs.
MIDI: 8-channel, multi-timbral reception
Terminals: Line Out Jacks [Output impedance: 2 KΩ Output voltage: 1.5V (rms) MAX],
Phone Jacks, MIDI Jacks (IN, OUT)
Power source: 120V AC (for U.S.A.)
120V/220V/230V/240V (for other countries)
Power consumption: 35 W (with 120V AC), 30 W (with 220V/230V/ 240V AC)
Dimensions (HWD): Without stand:165 × 1340 × 480 mm (6-1/2 × 52-13/16 × 18-15/16 inches)
With stand: 805 × 1360 × 480 mm (31-11/16 × 53-9/16 × 18-15/16 inches)
Weight: Without stand:25.0 kg (55.1 lbs)/28.0 kg (61.7 lbs)
With stand: 35.5 kg (78.3 lbs)/38.5 kg (84.9 lbs)
Note: There are two models of AP-10, one has a keyboard cover, the other has no keyboard cover.
— 3 —
Working Storage
RAM (64K-bit)
LSI304
LC3564SM-85
BLOCK DIAGRAM
MIDI
INOUT
Buttons
Sound Source ROM
(8M-bit)
LSI303
MX23C8100MC-
12CA27
Effect RAM
(256K-bit)
LSI305
LC333832M-70
EIO0 ~
EA0 ~
EA14
EIO7
MA0
~
MA12
MD0 ~ MD15
MA1 ~ MA19
MD0
~
MD7
UPD912GF-3BA
DSP
LSI302
HG51B227FB
LRCK SO BCK
CPU
LSI301
BCK, SO, LRCKMA0, MA1
HALL
STAGE
ROOM
SONGA
SONGB
MEMORY
KI0 ~ KI2
FI0 ~ FI10
SI0 ~ SI19
Keyboard
KC0 ~ KC7
Reset IC
IC 302
RN5VD24AA
LEDs
VDD
Speakers
Output
D/A Converter
LSI306
UPD6379GR
Filter
IC104
Main
Volume
Line Out Amp.
IC102
Power Amplifer
IC101
LA4620
LVDD
AVCC
AVDD
— 4 —
VDD
5V
5V
12.5V
5V
LINE OUT L
LINE OUT R
Voltage
Regulator
Q101 ~ 106,
and Q111
Power Switch
T101
Transformer
PS3M
PCB LAYOUT
PS1M
MA1MPS2M
ON
OFF
POWER
PS4M
PCB
Main PCB
Sub PCB
Console PCB
Other PCBs
VOLUME
MIN MAX
CHORUS REVERB
REVERB2
PIANO E.PIANO
CN1M
REVERB1
TONE
HARPSICHORD
PIPE
ORGAN STRINGS
MEMORY
DEMO
SONG A
START/
STOP
SONG B
RECORD
TRANSPOSE/
DIGITAL
TUNE/MIDI
EFFECT
TP8-KY1M TP8-KY2M
JCM358-
MA1M
CPU, DSP, Sound Source ROM Working storage
RAM, Effect RAM Reset IC, DAC
PS2M
Filter, Lineout Amp., Power Amp. Power supply cir-
cuit. MIDI input/output.
CN1M
PS1
PS3M
PS4M
Main Volume, LEDs, Buttons
Fuse, Noise filter
Head phone Jack
Power lamp
AP-10
Components
— 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 the keyboard cover
2-1. Remove L-shape metal on inside of the side board.
2-2. Slide the keyboard cover to open fully.
2-3. 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 the 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 2 screws fixing the power switch.
Insert paper here.
Hold this nut.
4. Disassembling keyboard unit
4-1. Remove 20 screws on the bottom.
4-2. Disconnect 2 connectors for the keyboard unit on the main PCB.
4-3. Remove the keyboard unit from the case.
Insert paper here.
— 7 —
5. Disassembling keys
5-1. Remove a key spring.
5-2. Use a long-nose plier, pressing the hook, lift the key.
Apply grease G501
6. Disassembling keyboard PCBs
6-1. Turn around the keyboard unit to face the PCB up.
6-2. Disconnect the connector at middle of the keyboard.
6-3. Remove screws on keyboard PCBs
— 8 —
7. 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 and short-pin
Lithium battery
— 9 —
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