Casio AP-10 User manual

ELECTRONIC KEYBOARD
AP-10
(with price)

— 2 —
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.

— 3 —
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 KΩOutput 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.

— 4 —
Buttons
Keyboard
FI0 ~ FI10
SI0 ~ SI19
KC0 ~ KC7
KI0 ~ KI2
MIDI
INOUT
Working Storage
RAM (64K-bit)
LSI304
LC3564SM-85
MA0
~
MA12
MD0
~
MD7
MD0 ~ MD15
MA1 ~ MA19
Sound Source ROM
(8M-bit)
LSI303
MX23C8100MC-
12CA27
CPU
LSI301
UPD912GF-3BA
BCK, SO, LRCKMA0, MA1
EA0 ~
EIO0 ~
EA14
EIO7
Effect RAM
(256K-bit)
LSI305
LC333832M-70
DSP
LSI302
HG51B227FB
LEDs
VDD
HALL
STAGE
ROOM
SONGA
SONGB
MEMORY
LRCK SO BCK
D/A Converter
LSI306
UPD6379GR
Filter
IC104
Main
Volume
LVDD
VDD
AVCC
AVDD
5V
5V
12.5V
5V
Voltage
Regulator
Q101 ~ 106,
and Q111
T101
Transformer
Power Switch
Power Amplifer
IC101
LA4620
Output
Speakers
Reset IC
IC 302
RN5VD24AA
Line Out Amp.
IC102 LINE OUT L
LINE OUT R
BLOCK DIAGRAM

— 5 —
PCB LAYOUT
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-10
MA1MPS2M
PS1M
PS3M
PS4M
CN1M
TP8-KY1M TP8-KY2M
PCB
Main PCB
Sub PCB
Console PCB
Other PCBs
JCM358-
MA1M
PS2M
CN1M
PS1
PS3M
PS4M
Components
CPU, DSP, Sound Source ROM Working storage
RAM, Effect RAM Reset IC, DAC
Filter, Lineout Amp., Power Amp. Power supply cir-
cuit. MIDI input/output.
Main Volume, LEDs, Buttons
Fuse, Noise filter
Head phone Jack
Power lamp

— 6 —
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.
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 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.

— 7 —
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.
Hold this nut.
Insert paper here.
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.

— 8 —
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

— 9 —
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

— 10 —
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
UPD912GF-3BA
Second contact First contact

— 11 —
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, LEDs
AVDD +5 V DAC
LVDD +5 V Power lamp
AVCC +12.5 V Filter
VC V Power amplifier

— 12 —
MAJOR WAVEFORMS
4DAC output CA connector pin 1
5DAC output CA connector pin 2
8Key scan signal KC0 CC connector pin 2
9Key scan signal KC1 CC connector pin 4
0Key scan signal KC2 CC connector pin 6
Tone : Pipe Organ
Key : A4
1VDD CA connector pin 6
2NMI CA connector pin 8
3POWER CA connector pin 9
A 1ms
CH1 .2V CH2 .2V
CH1
CH2
4
5
˜˜
A .5 s
CH1 5V CH2 5V
CH1
CH2
1
2
3
6Filter output CF connector pin 5
7Filter output CF connector pin 4
A 1ms
CH1 .2V CH2 .2V
CH1
CH2
6
7
˜˜
A 20µs
CH1 5V CH2 5V
CH1
CH2
8
9
0
CH3
CH3 5V

— 13 —
Check fuse F101.
Is F101 blown up?
Check fuse F102.
Is F102 blown up?
Is voltage 14 V AC?
Is voltage VC 17 V DC?
Is voltage VDD + 5 V DC?
Does signal NMI vary
as Fig 1?
Does signal POWER vary
as Fig 1?
Measure output voltage of
transformer T101.
Replace MA1M PCB.
Replace PS2M PCB.
• Check power switch.
• Check position of voltage
selector.
Is it OK ?
Replace T101.
Set voltage selector at proper
positon.
(A)
No
No
No
Yes
Replace F101.
Replace F102.
Yes
Yes
No
No
No
Yes
Yes
Yes
Yes
No
Fig 1
Yes
No
Switch ON
VDD voltage
Signal NMl
Signal POWER
0.9 sec
TROUBLESHOOTING
1. No power

— 14 —
Press "Hall" button.
Does the LED light up?
Measure voltage at pin 9 of CA
connector.
Is the voltage +5 V?
Is a noise made?
Touch pin2 of CF connector
with test rod (+).
Is a noise made?
Set main volume to maximum.
Touch pin1 of CA connector
with test rod (+) of multimeter
in resistance range, connecting
test rod (-) to ground.
Check main volume and
connection to the volume.
Replace MA1M PCB.
Follow from (A) of "No sound"
troubleshooting.
No
Yes
Yes
Yes
Yes
No
No
No
Replace PS2M PCB.
2. No sound

— 15 —
Replace PS2M PCB.
Is a sound ok? Yes
No
Replace MA1M PCB. End
Replace MA1M PCB.
Do the keys function? Yes
No
Replace keyboard PCBs. End
3. Distorted sound
4. Certain keys do not function
5. A certain key does not function
Clean the contact.
Does the key function?
Does the key function?
Yes
No
No
Replace key contact rubber.
Replace keyboard PCBs. End
Yes

— 16 —
Replace CN1M PCB.
Does the button function? Yes
No
Replace MA1M PCB. End
6. A certain button does not function

— 17 —
Speakers
Left
Right
PHONES
POWER Lamp
JCM358-PS4M
JCM358-PS3M
JCM358-PS1 TRANSFORMER MIDI
IN OUT
POWER
Switch PEDAL
UNIT
JCM358-PS2M
JCM358-CN1M
TP8-KY1M TP8-KY2M
CM-1
CM-2 CM-1 CM-2
LVDD
DG
BL
W
R
BK
BL
W
R
BK
TRANS
TRANS BR OCF-1
CF-2
CF-3
CF-4
CF-5
CF-R-O
CF-R-Y
CF-R-E
CF-R-BR
CF-R-R
Lmel OUT
Rmel OUT
AG
Lmel IN
Rmel IN
HALL
STAGE
ROOM
VDD
SONGA
SONGB
MEMORY
KC0
KC1
KC2
KC3
KI2
KI1
KI0
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-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
CE-1 CE-2 CE-3 CE-4
SOFT N.C. DAMPER GND
SOFT DAMPER GND
CA-1 CA-2 CA-3 CA-4 CA-5 CA-6 CA-7 CA-8 CA-9 CA-10 CA-11
CA-1 CA-2 CA-3 CA-4 CA-5 CA-6 CA-7 CA-8 CA-9 CA-10 CA-11
Rmel Lmel AG VDD FG VDD DG NMI POWER M-IN M-OUT
R BK R BK
LSP+ LSP– RSP+ RSP–
CG-1 CG-2 CG-3 CG-4 CG-5 CG-6 CG-7 CG-8 CG-9
CG-1 CG-2 CG-3 CG-4 CG-5 CG-6 CG-7 CG-8 CG-9
DG LVDD L-OUT L-IN LHp RHp R-IN AG R-OUT
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 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 FI4
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 CC-16 CC-17 CC-18 CC-19 CC-20
SI5 KC0 FI5 KC1 SI6 KC2 FI6 KC3 SI7 KC4 FI7 KC5 SI8 KC6 FI8 KC7 SI9 FI10 FI9 SI10
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16 17 18 19 20
JCM358-MA1M
WIRING DIAGRAM

— 18 —
EXPLODED VIEW
STAND
x4
x4
x2
x1
x8
x2
x2
U
x4
R-8 R-9 R-10
R-11 R-11
V

— 19 —
R-3
R-5
R-1
R-2
5
2
3
29
1
4
8
7
9
26
30
18
23
22
24
25
21 20
R-6
17
11
19
12 13 14 15 1618
19
6
26 10
27
R-4
28

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-10