casio AP-40 Service Manual
AP-40
INDEX
AUG. 2000
AP-40
DIGITAL PIANO
Ver.1 Oct. / 2000
CONTENTS
Page
Specifications ..........................................................................................................................................................1
Block Diagram.........................................................................................................................................................2
PCB Layout.............................................................................................................................................................3
Disassembly Instructions ........................................................................................................................................4
Circuit Description ...................................................................................................................................................8
Major Waveforms ..................................................................................................................................................10
Printed Circuit Board .............................................................................................................................................11
Troubleshooting ....................................................................................................................................................12
Wiring Diagram .....................................................................................................................................................16
Exploded View ......................................................................................................................................................17
Parts List ...............................................................................................................................................................19
Schematic Diagrams .............................................................................................................................................22
SPECIFICATIONS
GENERAL
Keyboard: 88 piano keys (with touch response)
Polyphonic: 32 notes, maximum
Tones: • 10 (including two bass tones)
• Tuning Curves: 3 (preset for each tone)
• Layer: Adjustable volume
• Split: Split point, adjustable volume
Digital Effects: Reverb (4 types), Chorus, Tremolo, Brilliance
Demo Tunes: • Number of Tunes: 8
• Playback: Repeat (all tunes, one tune)
Memory: • Operations: Real-time recording, playback
• Number of Tracks: 2 (Track A, Track B)
• Capacity: Approximately 5,000 notes (total of 2 tracks)
• Memory Backup: Built-in lithium battery (Battery Life: 5 years)
Song Lesson: • Number of Tunes: 80
• Playback: All song repeat, specific song
• Part Off: L, R
• Phrase Repeat
Pedals: Damper, Soft, Sostenuto
Other Functions: • Metronome: Beat (6 types), Tempo ( = 30 to 300)
• Touch Select: 3 types
• Transpose: 1 octave (F# to C to F)
• Tuning: A4 = 440Hz ±13Hz (adjustable)
• Temperament: 7 types
• Baroque pitch
MIDI: 16 multi-timbre receive
Input/Output: • Headphones: Stereo standard jacks × 2
• LINE OUT (R)(L): Monaural standard jacks × 2
Output impedance: 22KΩ
Output voltage: 2.0V (RMS) MAX
• LINE IN (R)(L): Monaural standard jacks × 2
Input impedance: 30KΩ
Input voltage: 200mV
• MIDI (OUT) (IN)
Speakers: Ø 16cm × 2, Ø 5cm × 2 (Output: 30W + 30W)
Power Supply: 120V (for U.S.A.), 120V, 220V, 230V and 240V (for other countries) AC household
current via AC power cord supplied with piano.
Power consumption: 70W (with 120V AC), 90W (with 220V, 230V and 240V AC)
Dimensions: • CELVIANO Only: 139.0 × 54.0 × 24.9 cm (54 3/4 × 21 1/4 × 9 13/16 inch)
• CELVIANO and Stand: 139.0 × 54.0 × 88.4 cm (54 3/4 × 21 1/4 × 34 13/16 inch)
Weight: • CELVIANO Only: approximately 48.5kg (107.1 lbs)
• CELVIANO and Stand: approximately 63.6kg (140.4 lbs)
— 1 —
BLOCK DIAGRAM
A0 ~ 19
RAM 256K
TC55257DFL-70L
LSI3
ROM 8M
MSM538002E-
W1-GS-K
LSI2
BRILLIANCE
A0 ~ 14
D0 ~ 7
PB4 ~ 6
D0 ~ 7
PEDAL
CPU
HD6435328RF35F
LSI1
HG51B155FD
MIDI
IN
OUT
M-IN M-OUT
DSP
LSI 7
P70 ~
P77
MUTE
Keyboard
Controller
HG52E35P
LSI10
P12 ~
P14
Switch & LED
Controller
uPD65005GF-419
LSI301
RST
RA0 ~ 22
RD0 ~ 15
EA0 ~ 14
ED0 ~ 15
KC0 ~ 7
FI0 ~ 10
SI0 ~ 10
L18 ~ 28
KI0 ~ 3
LA ~ LG, LP
LK8 ~ 14
Reset IC
MB3771PF
IC5
Keyboard
Buttons
LEDs
ROM 24M
MX23C2410MC-
TC55257DFL-70L
12CA58
LSI6
RAM 256K × 2
× 2
LSI8,9
AVCC
AVDD
AVFF
+15V
+5V
–15V
NJM78L05A
NJM7805FA
NJM78M15FA
T101
Power Switch
VDD
+5V
IC401,403,404
Power
Transformer
Voltage
selector
SOLM, SOLP
D/A Converter
uPD6376GS
Filter
Main
Volume
LINE OUT
LINE IN
Tweeter Tweeter
Mixer, Mute Circuit
Power Amp.
STK4132MK
BDK, WOK1, SORM, SORP
D/A Converter
uPD6376GS
LSI 5LSI 4
IC405
Filter
SPSP
HEADPHONE
— 2 —
PCB LAYOUT
PS11
PS2M
MA1M
PS3M
CN2M
CONTROL MIDI
BRILLIANCE
MELLOW BRIGHT
VOLUME
MIN
ROOM
STAGE
CHORUS
HALL 1
TREMOLO
HALL2
CHORUS/TREMOLO
MAX
POWER
ON
OFF
E
TRANSPOSE
E
TUNE
E
MIDI
E
BRILLIANCE
E
METRONOME VOL
CONTROL
PIANO 1 PIANO 2 E.PIANO
TONE
PIPE ORGAN STRINGS VIBRAHONE CHOIR
HARPSICHORD
LOWER TONE
CN1M
W. BASS
LIGHT
MIDDLE
HEAVY
TOUCH SELECT
E. BASS
MALTI FUNCTION DISPLAY
VALUE
TEMPO/BEAT/
FIXED
KY2MKY1M
SONG
PLAY/STOP PART
TRACKLRRECORD
AB
SONG LESSON/MEMORY
PHRASE REPEATPHRASE REPEAT NEXTMETRONOMEREVERB
DEMO
KY3M
PS4M
PCB JCM434- Components
Main PCB MA1M CPU, DSP, Sound Source ROM Working storage RAM,
Effect RAM Reset IC, DAC, Filter, Key con-troller, Power
amp, Power supply circuit
Jack PCBs PS2M LINE IN/OUT jack, MIDI jacks
PS3M Phone jacks
PS4M Power indicator
Console PCBs CN1M Gate array (Button controller/LED driver), LEDs, Buttons
CN2M Main Volume, Brilliance volume, LEDS, Buttons
Power PCB PS11 Fuse, Noise filter
— 3 —
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.
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.
— 4 —
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.
Insert paper here. Insert paper here.
3-1. Remove three screws afixing the console panel.
3-2. Remove the screw fixing a grounding wire at the transformer.
3-3. Disconnect two connectors CF on PCB JCM434-PS2M and CD on PCB JCM434-MA1M
3-4. Slide the console panel towards the front to free from catches.
3-5. Turn round the console panel.
3-6. Remove the 2 screws fixing the power switch.
— 5 —
4. Disassembling front cover
4-1. Remove 9 screws at the front edge on the bottom.
4-2. Unscrew 2 screws and remove JCM434-PS4M
5. Removal of keyboard unit
5-1. Disconnect connector CA on the PCB MA1M.
5-2. Remove 24 screws that affix the keyboard unit
(16 on the bottom of the case and 8 on the
keyboard unit).
5-3. Lift and remove the keyboard unit.
Keyboard screws
Front cover screws
Keyboard screws
Connector (CA)
Bottom
— 6 —
6. Removal of keys
6-1. While plying the side partition plastics with tweezers, push
the edge of the key toward front.
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 remo ve the jumper bef ore replacing
the PCB. And mak e sure that the jumper is reset on ne w main PCB after replacing the PCB. Because no
jumper is set on a spare part of the main PCB.
Lithium battery
Jumper
— 7 —
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
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
LSI
HG52E35P
— 8 —
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