Page 1
AP-24
INDEX
JUN. 2004
AP-24
ELECTRONIC KEYBOARD
Page 2
CONTENTS
Specifications ---------------------------------------------------------------------------------------------- 1
Block Diagram --------------------------------------------------------------------------------------------- 2
Circuit Description --------------------------------------------------------------------------------------- 3
Printed Circuit Board ------------------------------------------------------------------------------------ 4
Disassembly ------------------------------------------------------------------------------------------------ 6
Diagnostic Program------------------------------------------------------------------------------------ 15
Schematic Diagrams----------------------------------------------------------------------------------- 17
Exploded View ------------------------------------------------------------------------------------------- 26
Parts List--------------------------------------------------------------------------------------------------- 28
Page 3
SPECIFICATIONS
GENERAL
Keyboard: 88 piano keys (with touch response)
Polyphony: 32 notes, maximum
Tones: 10 tones (including two low-range tones for split), with layer and split
Digital Effects: Reverb (4 types), Chorus (4 types)
Demo Tunes: • Number of Tunes: 8
• Playback: Repeat (all tunes)
User Songs: • Number of Songs: Up to 10 download songs
• Capacity: Approximately 7600 notes (45 kilobytes)
Memory: • Operations: Real-time recording, playback
• Capacity: Approximately 5,200 notes (2 tracks)
• Memory Backup: Built-in lithium battery (Battery Life: 5 years)
Pedals: Damper, Soft/Sostenuto (Selectable)
Other Functions: • Metronome: Beat (6 types), Tempo (
• Touch Select: 3 types, off
• Transpose: 1 octave (F# to C to F)
• Tuning: A4 = 440Hz ±50 cents (adjustable)
MIDI: 16 multi-timbre receive
Input/Output: • Headphones: Stereo standard jacks × 2
• MIDI (OUT) (IN)
Speakers: ø12cm × 2 (Output: 20 W + 20 W)
Power Supply: AP-24: 120V
AP-24V: 220-240V
Power Consumption: AP-24: 55W
AP-24V: 58W
Dimensions: • Digital Piano (without stand): 137.2 u 42.3 u 20.5 cm (54 1/16 × 16 11/16 × 8 1/16 inch)
• Digital Piano: 138.5 × 43.2 × 81.0 cm (54 9/16 × 17 × 31 15/16 inch)
Weight: •Digital Piano (without stand): approximately 34.0 kg (75.0 lbs)
•Digital Piano: Approximately 44.0 kg (97.0 lbs)
= 30 to 255)
— 1 —
Page 4
BLOCK DIAGRAM
LED
Button
IC601
RXDITXDO
MPU
Keyboard
KC0~7
IC4
FI0~10
SI0~10
BCK, SD0, LRCK
IC8
Filter
D/A Converter
UPD63200GS
NJM2068M
R
Main Volume
IC11
LINE IN
L
Filter
IC205
NJM2068M
Filter
NJM2068M
R
IC12
LINE OUT
L
Filter
IC204
NJM2068M
SPSP
LA4636
Power AMP
IC203
LR
HEADPHONE
Button/LED Controller
UPD65881GK-002-9ET
DAMP, SOFT, STENT
PEDAL
ML6763B-NNTC-116
MA1~20
ROM(8MB)
MR27V3202F 16NTNZ08
MA1~16
MD0~15
IC5
MD0~15
IC6
CY62126DV30LL55ZIT
RAM(128K×16 Static RAM)
MIDI
IN
MIN
MOUT
OUT
RESET
RESET
IC15, Q7
Mute
VCVFVD5(5V)
VA15(15V)
Power Supply
IC202, Q205, D207
— 2 —
Page 5
KEY MATRIX
CIRCUIT DESCRIPTION
Second contact First contact
FI
2
1
KC
SI
LSI (IC4)
ML6763B-NNTC-116
KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7
FI0 A01 A0#1 B01 C11 C1#1 D11 D1#1 E11
SI0 A02 A0#2 B02 C12 C1#2 D12 D1#2 E12
FI1 F11 F1#1 G11 G1#1 A11 A1#1 B11 C21
SI1 F12 F1#2 G12 G1#2 A12 A1#2 B12 C22
FI2 C2#1 D21 D2#1 E21 F21 F2#1 G21 G2#1
SI2 C2#2 D22 D2#2 E22 F22 F2#2 G22 G2#2
FI3 A21 A2#1 B21 C31 C3#1 D31 D3#1 E31
SI3 A22 A2#2 B22 C32 C3#2 D32 D3#2 E32
FI4 F31 F3#1 G31 G3#1 A31 A3#1 B31 C41
SI4 F32 F3#2 G32 G3#2 A32 A3#2 B32 C42
FI5 C4#1 D41 D4#1 E41 F41 F4#1 G41 G4#1
SI5 C4#2 D42 D4#2 E42 F42 F4#2 G42 G4#2
FI6 A41 A4#1 B41 C51 C5#1 D51 D5#1 E51
SI6 A42 A4#2 B42 C52 C5#2 D52 D5#2 E52
FI7 F51 F5#1 G51 G5#1 A51 A5#1 B51 C61
SI7 F52 F5#2 G52 G5#2 A52 A5#2 B52 C62
FI8 C6#1 D61 D6#1 E61 F61 F6#1 G61 G6#1
SI8 C6#2 D62 D6#2 E62 F62 F6#2 G62 G6#2
FI9 A61 A6#1 B61 C71 C7#1 D71 D7#1 E71
SI9 A62 A6#2 B62 C72 C7#2 D72 D7#2 E72
FI10 F71 F7#1 G71 G7#1 A71 A7#1 B71 C81
SI10 F72 F7#2 G72 G7#2 A72 A7#2 B72 C82
NOMENCLATURE OF KEYS
A#1A#0 G#1F#1D#1C#1 A#6G#6F#6D#6C#6
C1 D1 E1 F1 G1 A1 B1A0 B0
C2 D2 E2 F2 G2 A2 B2 C3 D3 E3 B6A6G6F6E6D6 C7
BUTTON MATRIX
KI0 KI1
KC0 CONTROL —
KC1 SPLIT METRONOME
KC2 START/STOP RECORD
D#3
C#3A#2G#2F#2D#2C#2
F#3G#3A#3 C#4D#4 F#4G#4A#4 C#5D#5 F#5G#5A#5
F3 G3 A3 B3 C4 D4 E4 F4 G4A4 B4 C5 D5 E5 F5 G5 A5 B5
— 3 —
C#7
C6
A#7G#7F#7D#7
B7A7G7F7E7D7 C8
Page 6
MAIN PCB M420-MAA1
PRINTED CIRCUIT BOARD
Top view
Bottom view
— 4 —
Page 7
SUB PCB M420-PSA1
CONSOLE PCB M420-PSA3
LED PCB M420-PSA4
Top view
POWER SUPPLY PCB M420-ACA1
JACK PCB M420-PSA2
Bottom view
— 5 —
Page 8
DISASSEMBLY
■ To remove the piano from the stand
1. Remove the pedal plug from the pedal connector
on the bottom of the piano, and then remove the
pedal cord from the clip.
2. Remove two butterfly bolts.
Slide the piano toward the rear side, and then
remove it from the brackets.
Clip
Pedal plug
Butterfly bolt
Bracket
■ To remove the pedal from the stand
1. Remove the two B screws and six C screws. 2. Remove four screws.
Rear side
A screw
Front side
B screws
C screws
— 6 —
Page 9
■ To remove the top board
1. Remove eight screws. 2. Slide the top board toward the front side. Next,
lift the top board and remove it from the piano.
2
1
■ To remove the keyboard cover
1. Close the keyboard cover.
2. Remove one screw and the bracket.
3. Lift the gear part upward(1), and then slide the
keyboard cover toward the rear side (2) to
remove it.
— 7 —
1
2
Page 10
■ To remove the keyboard
1. Remove the two A screws on the front side and the panel.
2. Remove the three C screws on the back side. Next, remove the eight B screws on the front side and remove
the bracket.
Front side
Back side
A screw B screws C screws
— 8 —
Page 11
3. Remove 19 screws on the back side. Next, remove three screws and one FPC on the front side, and then
remove the key ASSY.
Back side
Front side
— 9 —
Page 12
■ To remove the key PCB
1. Remove two screws and the bracket.
2. Remove the cushion (1), pull the hammer (2),
and then remove the key from the hammer (3).
3. Insert the edge of the tweezers as shown in part
a of the below figure to remove the key.
1
a
2
3
4. Remove eight rubber keys.
5. Remove 32 screws and the key PCB.
*Precautions when assembling the rubber keys
1 2
The length of this only one rubber key is different. The numbers of pins on the upper and lower sides
are different. Insert the pins and fix them tightly.
3
Seven Pins
Eight Pins
— 10 —
1
Four Pins
22
Three Pins
Page 13
■ To remove the PCB
5SL
1. To remove the M420-MAA1 PCB
Remove six screws and two connectors.
3
4
5CL
2
5CR
1
1S
5SR
2. To remove the M420-PSA1 PCB
Remove eight screws, five connectors, and five lead wires.
S
3. To remove the M420-ACA1U PCB
Remove four lead wires, one
connector, and four clips.
— 11 —
Page 14
4. To remove the transformer
Remove four screws and seven lead wires.
5. To remove the speaker
Remove eight screws and two connectors.
SL
CL
SR
CR
— 12 —
Page 15
■ To remove the M420-PSA4 PCB
1. Remove six screws and the front board.
2. Remove two screws and the PSA4 PCB.
■ To remove the M420-PSA2 PCB and the M420-PSA3 PCB
1. Remove three screws. 2. Remove two screws and the switch.
— 13 —
Page 16
3. Remove two screws and the bracket.
4. Remove two nuts and the M420-PSA2 PCB.
5. Remove one screw and one volume knob, and then remove the M420-PSA3 PCB.
— 14 —
Page 17
DIAGNOSTIC PROGRAM
■ Initial Setup
1. Connect an AC adaptor.
2. Connect a Pedal.
3. “Main” volume: MAX.
NOTE: If there is no pedal cable, pedal check can be skipped.
■ How to start diagnostic program
1. Press the “POWER” button while pressing the “METRONOME” buttons.
2. Release the “POWER” button first while still pressing the “METRONOME” buttons.
All the LEDs light and the test mode boots.
■ Diagnostic program
1. Automatic Test
1 RAM CHECK
* When an error is found in RAM, “USER_SONG” LED lights.
2 ROM CHECK
* When an error is found in ROM, “SPLIT” LED lights.
* The confirmation chord of C4, E4 and G4 sounds.
3 LED CHECK
The LED continues to light in the order of USER_SONG 씮 PART(L) 씮 PART(R) 씮 SPLIT.
2. BUTTON check
1 Press “CONTROL” button.
* The confirmation chord of C4, E4 and G4 sounds.
2 Press the buttons in the following order.
(1) “METRONOME” Button
* The confirmation tone of C6 sounds.
(2) “RECORD” Button
* The confirmation tone of C6 sounds.
(3) “START/STOP” Button
* The confirmation tone of C6 sounds.
(4) “SPLIT” Button
* The confirmation tone of C6 sounds.
(5) “CONTROL” Button
* The confirmation chord of C4, E4 and G4 sounds.
3. Pedal check (If there is no Pedal, this check can be skipped)
1 Press “CONTROL” button.
*The confirmation chord of C4, E4 and G4 sounds.
2 Press the “DAMPER” pedal.
* The confirmation tone of C4 sounds and “PART(R)” LED lights.
3 Press the “SOFT” pedal.
* The confirmation tone of C4 sounds and “PART(L)” LED lights.
— 15 —
Page 18
4. Headphone check
1 Press “CONTROL” button.
* The confirmation chord of C4, E4 and G4 sounds.
2 Connect the headphone to the jack.
* “PART(R)” LED lights.
3 Remove the headphone from the jack.
* “PART(L)” LED lights.
4 Connect the tuning meter to the jack.
* “PART(R)” LED lights.
5 Press A4 key.
* Make sure that the tuning meter is set at 440 ± 2 cents.
6 Remove the tuning meter from the jack.
* “PART(L)” LED lights.
5. MIDI IN/OUT check (If there is no MIDI cable, this check can be skipped)
1 Connect MIDI IN and MIDI OUT terminals with a MIDI cable.
2 Press “CONTROL” button.
* The confirmation chord of C4, E4 and G4 sounds.
* “PART(L)” LED lights.
3 Press “A4 KEY” button.
* The confirmation chord of C4, E4 and G4 sounds.
6. ROM version check
Version: 1.20
* LED should be in the following state.
USER_SONG LED: Turn on
PART(L) LED: Turn off
PART(R) LED: Turn off
SPLIT LED: Turn off
7. The diagnostic program ends.
— 16 —
Page 19
MAIN PCB M420-MAA1
SCHEMATIC DIAGRAMS
— 17 —
Page 20
SUB PCB M420-PSA1
— 18 —
Page 21
JACK PCB M420-PSA2
— 19 —
Page 22
CONSOLE PCB M420-PSA3
— 20 —
Page 23
LED PCB M420-PSA4
— 21 —
Page 24
POWER SUPPLY PCB M420-ACA1
— 22 —
Page 25
Keyboard PCB MPCK-KYA1
— 23 —
Page 26
Keyboard PCB MPCK-KYB2
— 24 —
Page 27
Keyboard PCB MPCK-KYA3
— 25 —
Page 28
EXPLODED VIEW
9 9-1
14
18
17
7
1
8
2
10
11
6
41
20
11
12
15
16
4
19
5
3
12
13
21
28
29
30
26
32
22
25
40
39
23
33
34
24
37
38
36
27
— 26 —
31
35
Page 29
46
47
44 45 44 45
48
49
43
42
x4
x6
x1
x2
x2
x2
x2
x2
50
Connecting the Pedal
Clip
Pedal plug
— 27 —
Page 30
PARTS LIST
AP-24
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.
— 28 —
Page 31
N Item Parts code Parts name Specification QTY
Price
MAIN PCB
N11016 4281
PCB ASSY/MAIN
TK-RJM503852*001
1
DW
A
BT1
1005 2229
BATTERY
CR2032/1HF1
1
AG
C
CN3
3501 7259
CONNECTOR
30FMZ-BT
1
AF
C
CN1
3501 3465
CONNECTOR
B11B-PH-K-S
1
AC
C
CN5
3500 5847
CONNECTOR
B12B-PH-K-S
1
AB
C
IC9
6932 0063
IC
R1151N001C-TR
1
AN
C
IC7
1012 3003
IC
TC74VHCT08AFT(EL)
1
AC
C
IC1
1004 0865
IC
TC7SH04FU(TE85L)
1
AA
C
IC10,11
1004 0647
IC
TC7SH08FU(TE85L)
2
AA
C
IC2
6930 9994
IC
TC7SH32FU(TE85L)
1
AB
C
IC3
1011 6307
IC
TC7SZ126FU(TE85L)
1
AB
C
IC8
2105 6665
IC
UPD63200GS-E1
1
AX
C
N
IC6
1015 8046
MEMORY
CY62126DV30LL55ZIT
1
AV
C
N
IC5
1016 4081
MEMORY
MR27V3202F16NTNZ08
1
BF
CQ62259 2764
TRANSISTOR
2SB1188T100Q
1
AB
CQ72253 0715
TRANSISTOR
2SD1664T100Q
1
AA
CQ51011 6461
TRANSISTOR
KTC4075GR-RTK
1
AA
C
PSA1 PCB
N21016 4287
PCB ASSY/PSA1J
TK-RJM503835*001
1DBB
120V
N21016 4288
PCB ASSYPSA1E
TK-RJM503886*001
1DBB
230V
Q1,2,3,4
1007 9927
TRANSISTOR
KTC3199GR-AT
4
AACCN9
3501 7371
CONNECTOR
B6B-EH
1
AACCN19
1008 1222
CONNECTOR
HDC-052S-02
1
AFCFU1
1005 2231
FUSE
51MS010L
1ACA
120V
FU1
1005 4029
FUSE
50T010H
1ACA
230V
FU2,3
1005 2230
FUSE
51MS040L
2
AC
A
120V
FU2,3
1005 4030
FUSE
50T040H
2
AC
A
230V
IC1
1004 3418
IC
LM4765T
1
BCCIC4,5
2121 0072
IC
NJM2068DD
2
ADCIC2
2114 5796
IC
NJM78M05FA
1
AECIC3
2114 5794
IC
NJM78M15FA
1
AE
C
PS2A,3A PCB
N31016 4306
PCB ASSY/PSA2
TK-RJM503837*001
1
CE
C
N41016 4308
PCB ASSY/PSA3
TK-RJM503839*001
1
BV
B
N
D2,3,4
1016 4051
LED
KM2520SRC36-FPB
3
ABXVR1
6930 8726
VARIABLE R
RK09K12C0D0W
1
AIXD1
1013 5479
LED
LT2P71-81-M1-S01
1
AAXSW1,2,3,4,5
1004 7536
SWITCH
SKQNAED010
5
AA
X
MAIN CASE UNIT
N51016 4276
CASE ASSY/MAIN
TK-RJM503766*001
1ECC
N61016 4274
COVER ASSY/KEY
TK-RJM503765*001
1
CZ
C
N71016 4275
BOARD ASSY/TOP
TK-RJM503763*001
1
CX
C
N81016 4284
PCB ASSY/ACA1U
TK-RJM503880*001
1BAB
120V
FU1
1004 7399
FUSE
51MS032L
1ACA
120V
N81016 4286
PCB ASSY/ACA1E
TK-RJM503882*001
1AZB
230V
FU1
1004 7508
FUSE
50T025H
1ACA
230V
N91016 4278
CORD ASSY/AC
TK-RJM503864*002
1AMC
120V
9
1004 5707
CORD SET
BC2NC-M001A
1
BD
C
For UK
9
1010 0792
CORD SET
INQ.1258(1)
1
AP
C
For Korea
9
1004 5706
CORD SET
EC2NC-M001A
1
AM
C
For Euro
N
9-1
1016 4279
INLET ASSY/AC
TK-RJM503865*001
1AHC
230V
10
1005 4031
TRANSFORMER
TE-427-1M1
1CWC
120V
10
1005 4032
TRANSFORMER
TE-427-2M1
1CWC
230V
11
1005 2227
SPEAKER
S12J99A
2CDC
Code R Remarks
- 29 -
Page 32
N Item Parts code Parts name Specification QTY
Price
12
1005 2226
SPEAKER NET
M441205-001
2ACX
13
1005 2365
SIDE BLOCK/R
M141157-001
1
AD
X
N141016 3747
SIDE BLOCK/L
M141156-002V01
1
AD
X
N151016 4307
SW ASSY/POWER
TK-RJM503866*001
1
AR
C
N161016 4451
RUBBER/KEY
RJM503784-001V01
1
AF
C
17
1005 2232
KNOB/RTR
M341402-001
1
AE
C
18
6924 5260
BUTTON/POWER
M340318-001
1
AA
C
N191016 4303
BOARD ASSY/FRONT
TK-RJM503767*001
1
CI
C
Keyboard UNIT
N201016 4291
KEY ASSY
TK-RJM504178*001
1EHA
N211016 4305
CHASSIS ASSY
TK-RJM504180*001
1
DK
C
22
1013 5317
BLACK KEY
RJM502797-001V01
36
AC
C
23
1013 5426
WHITE KEY/CEGB
RJM502862-001V01
7
AT
C
4pcs-1set
24
1013 5427
WHITE KEY/DFA
RJM502863-001V01
7
AQ
C
3pcs-1set
25
1013 5428
WHITE KEY/B
RJM502794-001V01
1
AG
C
26
1013 5429
WHITE KEY/SA
RJM502795-001V01
1
AJ
C
27
1013 5430
WHITE KEY/SC
RJM502796-001V01
1
AJ
C
28
1013 5435
HAMMER ASSY/W1
TK-RJM503155*001
13
AL
C
29
1013 5436
HAMMER ASSY/W2
TK-RJM503216*001
13
AL
C
30
1013 5437
HAMMER ASSY/W3
TK-RJM503217*001
13
AL
C
31
1013 5438
HAMMER ASSY/W4
TK-RJM503218*001
13
AL
C
32
1013 5439
HAMMER ASSY/B1
TK-RJM503219*001
9
AK
C
33
1013 5440
HAMMER ASSY/B2
TK-RJM503220*001
9
AK
C
34
1013 5442
HAMMER ASSY/B3
TK-RJM503221*001
9
AK
C
35
1013 5443
HAMMER ASSY/B4
TK-RJM503222*001
9
AK
C
36
3719 5442
CABLE
N30315B1B05-UL2896
1
AO
C
37
1013 3656
KEY RUBBER
RJM502920-001V01
7AKC
38
1013 3635
KEY RUBBER
RJM502921-001V01
1AGC
39
1013 3488
PCB ASSY/KYA
TK-RJM503365*001
1BIC
2pcs-1set
40
1013 3482
PCB ASSY/KYB
TK-RJM503366*001
1BCC
PANEL ASSY
N411016 4289
PANEL ASSY
TK-RJM503770*001
1BVC
STAND
N421016 4309
SCREW SET
TK-RJM503810*001
1
AN
BN43
1016 0961
STAND BOARD/BACK
RJM503742-001V01
1
BN
CN44
1016 4310
FOOT ASSY
TK-RJM503823*001
2
BA
CN45
1016 0973
FOOT /B
RJM503826-001V01
2
AA
CN46
1016 0963
STAND BOARD/R
RJM503744-001V01
1
BS
CN47
1016 0962
STAND BOARD/L
RJM503743-001V01
1
BS
CN48
1016 4311
BOARD ASSY/PEDAL
TK-RJM503776*001
1
CH
CN49
1016 4313
PEDAL ASSY
TK-RJM503901*001
1
BV
CN50
1016 4048
CABLE
SMR-3P-155-M420
1
AI
B
ACCESSORY
-
1005 4066
STAND ASSY/MUSIC
TK-M241576*2(M427)
1
CVCFor US
-
1005 2234
STAND ASSY/MUSIC
TK-M241576*1(M427)
1
CHCExcept US
Notes:
N
- New parts
Q
-Quantity used per unit
Code R Remarks
- 30 -
Page 33
CASIO TECHNO CO.,LTD.
Overseas Service Division
6-2, Hon-machi 1-Chome
Shibuya-ku, Tokyo 151-8543, Japan
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