Casio AP420 Service Manual

(without price)

AP-420

INDEX

AUG. 2009

AP-420

ELECTRONIC KEYBOARD

Ver . 3 : Sep. 2011

CONTENTs

sPECIfICATIONs .....................................................................................................................1

BLOCK AND WIRING DIAGRAM ............................................................................................2

PCB LAYOUT ...........................................................................................................................3

CIRCUIT DEsCRIPTION ..........................................................................................................4

PRINTED CIRCUIT BOARDs ...................................................................................................6

DIsAssEMBLY ....................................................................................................................... 11

DIAGNOsTIC PROGRAM ......................................................................................................40

EXPLODED VIEW ...................................................................................................................48

PARTs LIsT ............................................................................................................................50

sChEMATIC DIAGRAMs .......................................................................................................55

sPECIfICATIONs

Keyboard 88-key piano keyboard, with Touch Response
Maximum Polyphony 128 notes
Tones 16

Layer (excluding bass tones)
Split (Low-range bass tones only)
Effects Brilliance (–3 to 0 to 3), Reverb (4 types), Chorus (4 types), DSP,
Acoustic Resonance
Metronome Beats: 0, 2, 3, 4, 5, 6
Tempo Range: 20 to 255

Duet Adjustable tone range (–1 to 2 octaves)
Music Library Number of Songs: 60, User Songs: 1 (memory capacity; up to 65 KB)*

* Based on 1 KB = 1024 bytes, 1 MB = 10242 bytes
Song volume: Adjustable
Part On/Off: L, R
Recorder Functions: Real-time recording, playback
Number of Song: 1
Number of Tracks: 2
Capacity: Approximately 5,000 notes total

 RecordedDataProtection:Built-inashmemory

Pedals Damper (with half-pedal operation), Soft, Sostenuto
Other functions Touch Select: 3 types, Off

Transpose: 2 octaves (–12 to 0 to 12)
Tuning: A4 = 440.0 Hz ±99 cents (variable)
Temperament
Octave shift
Operation Lock

MIDI 16-channel multi-timbre receive
sD Memory Card SD memory card slot

Supported SD Memory Cards: Up to 2 GB

 Functions:SMFplayback,lestorage,lerecall,cardformat

Inputs/Outputs PHONES jacks: Stereo standard jacks × 2
Power: 24 V DC (Max.)
LINE OUT R, L/MONO jacks: Standard jacks × 2

   Outputimpedance:2.3KΩ

Output voltage: 1.1 V (RMS) MAX
USB port: TYPE B
Pedal connector

speakers φ12cm×2+φ5cm×2(Output20W+20W)
Power Requirements ACAdaptor:AD-E24250LW
Power Consumption 24 V 60W
Dimensions Digital Piano and Stand:

 139.5(W)×42.7(D)×83.5(H)cm(54

Weight Digital Piano and Stand: approximately 40.0kg (88.2 lbs)

15

/16 × 16 13/16 × 32 14/16 inch)

•Specicationsanddesignsaresubjecttochangewithoutnotice.

– 1 –

BLOCK AND WIRING DIAGRAM

LINE OUT
L/MONO (J503)
R (J504)

JACK PCB (M901-JKA1)

CN5

CN12

CN10

CN7

SPEAKERS

&

TWEETERS

RS

RT

LT

LS

CN601 (12 pin)

CN7 (8 pin)

CN5 (5 pin)

CN4 (12 pin)

CN2 (20 pin)

CN802 (20 pin)

CN801 (12 pin) CN803 (12 pin)

CN1 (30 pin)

CN804 (30 pin)

CN801 (20 pin)

CN603 (20 pin)

CN602 (14 pin)

CN803 (14 pin)

CN601 (14 pin)

CN601 (12 pin) CN602 (12 pin)

CN802 (14 pin)

CN12 (9 pin)

CN14 (5 pin)

CN13 (4 pin)

CN4 (2 pin)

CN702 (2 pin)

CN3

CN701 (4 pin)

CN16 (9 pin)

USB (CN9)

BUTTONS

CN602 (5 pin)

POWER
SWITCH

PHONES
(J701, J702)

23 V

DC IN

(J2)

CN751 (8 pin)

SD CARD PCB
(M810-SDA1)

CN503 (3 pin)

CN17 (3 pin)

MPU

IC5

NOR FLASH MEMORY

(256 Mbit)

IC6

FCRAM

(32 Mbit)

IC7

DAC
IC13

FILTER

IC5

FILTER

IC7, IC9, IC11

HEADPHONE

AMPLIFIER

IC4

POWER

AMPLIFIER

IC2

SDRAM

(256 Mbit)

IC2

VD3

VC VCM

VA3

VD5

VD5

LOUT

ROUT

VD5

VA12

VA12

VA5

POWER SUPPLY

CIRCUIT

Q7, C107-C113

POWER SUPPLY CIRCUIT

IC1, IC3, C23, C31, C33, C35,

C37, C48, C55, D4, D9, D10

KEY CONTROLLER

IC14

MAIN PCB
(M900-MDA1)

SUB PCB
(M903-PSA1)

KEYBORAD PCB (MACP-KYB1)

KEYBORAD PCB (MACP-KYD1)

CONSOLE PCB
(M902-CNA1)

PEDAL
UNIT

KEYBORAD PCB
(MACP-KYA2)

KEYBORAD PCB
(MACP-KYB2)

KEYBORAD PCB
(MACP-KYA1)

KEYBORAD PCB
(MACP-KYC1)

KEYBORAD PCB
(MACP-KYC2)

VOLUME PCB

(M902-CNA2)

POWER LAMP PCB

(M902-HPA2)

JACK PCB

(M902-HPA1)

FI0-FI10, SI0-SI10, KC0-KC7

KI0-KI10,
KO0-KO-7, NC

SDD0-SD015

SDA0-SDA12, SDBA0, SDBA1

A1-A23

A1-A21

D0-D15

D0-D15

– 2 –

PCB LAYOUT

PCBs Components

Main PCB M900-MDA1 MPU, Reset IC, SDRAM (256 Mbit), Flash Memory (256 Mbit),

FCRAM (32 Mbit), Power Supply Circuit, Key Controller, USB Port
Sub PCB M903-PSA1 DC 12 V Terminal, Power Supply Circuit, Filter, Power Amplifer
Console PCB M902-CNA1 Buttons
Volume PCB M902-CNA2 Main Volume
Jack PCBs M902-HPA1 Phones Jacks

M901-JKA1 LINE OUT (R, L/MONO) jacks
SD Card PCB M810-SDA1 SD Card Slot
Power Lamp PCB M902-HPA2 Power Lamp
Keyboard PCBs MACP-KYA1 Keyboard

MACP-KYA2

MACP-KYB1

MACP-KYB2

MACP-KYC1

MACP-KYC2

MACP-KYD1

M902-CNA2

M902-CNA1

M901-JKA1

M901-JKA1

M903-PSA1

M900-MDA1

M810-SDA1

M903-PSA1

M900-MDA1

MACP-KYA1

M902-HPA2

M902-HPA1

MACP-KYA2 MACP-KYB1 MACP-KYB2

MACP-KYC1 MACP-KYD1 MACP-KYC2

– 3 –

KEY MATRIX

KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7

fI0 A0



A0#



B0



C1



C1#



D1



D1#



E1



sI0 A0



A0#



B0



C1



C1#



D1



D1#



E1



fI1 F1



F1#



G1



G1#



A1



A1#



B1



C2



sI1 F1



F1#



G1



G1#



A1



A1#



B1



C2



fI2 C2#



D2



D2#



E2



F2



F2#



G2



G2#



sI2 C2#



D2



D2#



E2



F2



F2#



G2



G2#



fI3 A2



A2#



B2



C3



C3#



D3



D3#



E3



sI3 A2



A2#



B2



C3



C3#



D3



D3#



E3



fI4 F3



F3#



G3



G3#



A3



A3#



B3



C4



sI4 F3



F3#



G3



G3#



A3



A3#



B3



C4



fI5 C4#



D4



D4#



E4



F4



F4#



G4



G4#



sI5 C4#



D4



D4#



E4



F4



F4#



G4



G4#



fI6 A4



A4#



B4



C5



C5#



D5



D5#



E5



sI6 A4



A4#



B4



C5



C5#



D5



D5#



E5



fI7 F5



F5#



G5



G5#



A5



A5#



B5



C6



sI7 F5



F5#



G5



G5#



A5



A5#



B5



C6



fI8 C6#



D6



D6#



E6



F6



F6#



G6



G6#



sI8 C6#



D6



D6#



E6



F6



F6#



G6



G6#



fI9 A6



A6#



B6



C7



C7#



D7



D7#



E7



sI9 A6



A6#



B6



C7



C7#



D7



D7#



E7



fI10 F7



F7#



G7



G7#



A7



A7#



B7



C8



sI10 F7



F7#



G7



G7#



A7



A7#



B7



C8



KO0 KO1 KO2 KO3 KO4 KO5 KO6 KO7

KI0 A0

3

A0#

3

B0

3

C1

3

C1#

3

D1

3

D1#

3

E1

3

KI1 F1

3

F1#

3

G1

3

G1#

3

A1

3

A1#

3

B1

3

C2

3

KI2 C2#

3

D2

3

D2#

3

E2

3

F2

3

F2#

3

G2

3

G2#

3

KI3 A2

3

A2#

3

B2

3

C3

3

C3#

3

D3

3

D3#

3

E3

3

KI4 F3

3

F3#

3

G3

3

G3#

3

A3

3

A3#

3

B3

3

C4

3

KI5 C4#

3

D4

3

D4#

3

E4

3

F4

3

F4#

3

G4

3

G4#

3

KI6 A4

3

A4#

3

B4

3

C5

3

C5#

3

D5

3

D5#

3

E5

3

KI7 F5

3

F5#

3

G5

3

G5#

3

A5

3

A5#

3

B5

3

C6

3

KI8 C6#

3

D6

3

D6#

3

E6

3

F6

3

F6#

3

G6

3

G6#

3

KI9 A6

3

A6#

3

B6

3

C7

3

C7#

3

D7

3

D7#

3

E7

3

KI10 F7

3

F7#

3

G7

3

G7#

3

A7

3

A7#

3

B7

3

C8

3

CIRCUIT DEsCRIPTION

– 4 –

NOMENCLATURE Of KEYs

F#3G#3 A#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 C6

D#3

C2 D2 E2 F2 G2A2 B2 C3 D3 E3

B6A6G6F6E6D6 C7

C#3A#2G#2F#2D#2C#2

C1 D1 E1 F1 G1A1 B1A0 B0

A#1A#0 G#1F#1D#1C#1 A#6G#6F#6D#6C#6

B7A7G7F7E7D7 C8

A#7G#7F#7D#7C#7

BUTTON MATRIX

sO0 sO1 sO2

sI0 FUNCTION METRONOME ELEC PIANO
sI1 ― SONG u/

n

sI2 ― CLASSIC RECORDER

MODERN

– 5 –

PRINTED CIRCUIT BOARDs

Main PCB M900-MDA1 sub PCB M903-PsA1

– 6 –

Console PCB M902-CNA1

Volume PCB M902-CNA2

Jack PCB M902-hPA1 Power Lamp PCB M902-hPA2

Keyboard PCB MACP-KYA1

Jack PCB M901-JKA1

sD Card PCB M810-sDA1

–7–

Keyboard PCB MACP-KYA2

Keyboard PCB MACP-KYB1

– 8 –

Keyboard PCB MACP-KYB2

Keyboard PCB MACP-KYC1

– 9 –

Keyboard PCB MACP-KYC2

Keyboard PCB MACP-KYD1

– 10 –

Pedal connector

ButteryboltButterybolt

Screw Screw

DIsAssEMBLY

The photos show a prototype. The appearance of the instrument, such as color, may
differ from the actual model.

To avoid damages to the instrument and the oor, lay the instrument on a mattress or

blanket before starting disassembling.

Removing the main unit



Remove the pedal unit plug from the pedal connector.1.
Undotwoscrewsandtwobutteryboltsonthebottomsurfaceoftheunit.2.

Dismount the main unit from the stand.3.

Dismounting or mounting the unit to the stand must be done by two or more people.NOTE:
Close the keyboard cover when disassembling or assembling the unit.NOTE:

– 11 –



Pedal unit

Removing the pedal unit

Undo six screws on the back surface of the stand.1.

Undo four screws and then remove the pedal unit.2.

– 12 –



Removing the stand

Undo two screws on the back surface of the stand and then remove the stand.1.

– 13 –



Removing the TOP-BOARD-AssY

Undo three screws.1.

Remove the TOP-BOARD-ASSY.2.

TOP-BOARD-ASSY

– 14 –



Stoppers

Removing the KEY-COVER-AssY

Close the keyboard cover.1.
Undo two screws and then remove two stoppers on the left and right ends.2.

Open the keyboard cover.3.

Grip where the stoppers were removed and lift up the gear section of the keyboard cover.4.

– 15 –

Slide the keyboard cover at an angle, disengage one of the slide pins off the railing, and remove the 5.
KEY-COVER-ASSY.

KEY-COVER-ASSY

– 16 –



About Wiring

Whenreplacingcomponents,youmayhavetoremovecabletiesorclips.Ifyouremovecabletiesor

clips, be sure to tie cables back to the original conditions when reassembling.

<Wheretotie/bundlecables>

: Cable tie : Cable clip

M902-CNA1, M902-CNA2,
M902-HPA1

M902-CNA1, M902-CNA2,
M902-HPA1, M902-HPA2

M902-HPA2, M901-JKA1,
Left speaker, Left tweeter

M902-HPA1, M902-CNA2,
Right speaker, Right tweeter

–17–



Removing the main PCB (M900-MDA1)

Release the lock and remove two FFCs.1.
Remove three connectors.2.

M900-MDA1 PCB

Connector (M902-CNA1)

Connector (M900-PSA1)

Undoandremovethescrewxingtheferritecoreanddisconnectthepedalconnector.3.

Pedal connector

Undo four screws on the M900-MDA1 PCB bracket.4.

Ferrite core

FFCs (Keyboard)

Connector (M810-SDA1)

– 18 –



M903-PSA1 PCB

Connector (M902-HPA2)

Connector (M902-CNA2)

Connector (M902-HPA1)

Connector (Power switch)

Connector (M901-JKA1)

Connector (Left speaker)

Connector (Left tweeter) Connector (Right speaker)Connector (Right tweeter)

UndovescrewsandthenremovetheferritecoreandtheM900-MDA1PCB.5.

Ferrite core

Undo four screws on the M903-PSA1 PCB bracket.2.

Removign the sub PCB (M903-PsA1)

Remove nine connectors.1.

– 19 –

Removing the jack PCB (M901-JKA1)



Undo two screws on the M901-JKA1 PCB bracket.1.

Removing the sD card PCB (M810-sDA1)



Undo two screws and then remove the M810-SDA1 PCB.1.

M901-JKA1 PCB

Undo four screws and then remove the M900-PSA1 PCB.3.

Undo two nuts and then remove the M901-JKA1 PCB.2.

– 20 –



CONSOLE-PANEL-ASSY

Removing the CONsOLE-PANEL-AssY

Undo 12 screws and then remove the CONSOLE-PANEL-ASSY.1.

There are two types of screws. Be sure to use the correct screw when reassembling.NOTE:

– 21 –



Removing the left side unit

Undo two screws on the bottom surface of the unit.1.

Remove the left side unit.2.



Removing the jack PCB (M902-hPA1)

Undo two screws and then remove the M902-HPA1 PCB1.

– 22 –



Removing the console PCB (M902-CNA1), and the volume PCB (M902-CNA2)

Remove the volume knob.1.

Volume knob

UndovescrewsandthenremovetheM902-CNA1PCB,M902-CNA2PCB,andrubberkey.2.

M902-CNA2 PCB



M902-CNA1 PCBRubber key

Removing the right side unit

Undo two screws on the bottom surface of the unit.1.

Remove the right side unit.2.

– 23 –



Undo two screws and then remove the M902-HPA2.2.



Removing the power switch

Undo two screws and then remove the power switch.1.

Removing the power lamp PCB (M902-hPA2)

Undo six screws and then remove the FRONT-BOARD-ASSY.1.

FRONT-BORAD-ASSY

– 24 –





Removing the tweeter

Undo two screws and then remove the tweeter.1.
Similarly remove the other tweeter.2.

Removing the speaker

Undo four screws and then remove the speaker.1.

The speaker net also comes off.NOTE:

Similarly remove the other speaker.2.

– 25 –



Removing the KY-ASSY

Undo 19 screws.1.

Undo three screws and then remove the KY-ASSY.2.

Undo six screws and then remove six brackets.3.

KY-ASSY

– 26 –



Width:

15~20 mm

R=2.75mm

Use this part to
remove the key.

7mm

Thickness:
within 1.2~1.3 mm

Removing the keys

<Removing the keys>

To remove the keys, you will need two of the tools described below.

Beforeremovingablackkey,youmustrstremovebothwhitekeysoneithersideoftheblackkey.
Whitekeysmayberemovedwiththesameproceduresasremovingblackkeys.

<Tool>

The tool used in the photos in this section was converted from a gardening ID tag. The size and shape
of an ID tag accord to the dimensions below.

<Note on shaping an ID tag>

The thickness of the tool must be within 1.2~1.3 mm.

Ifthetoolistoothin,removingkeysbecomedifcult.

If the tool is too thick, it may damage the rib of the chassis.

<Tool dimensions>

–27–

Insert the two tools between the rib of the chassis and a key.1.

Tools

Chassis

Tool

Key

Rib of the chassis

Whenthetoolsareinsertedtoacertaindepth,thekeybeginstobeliftedandcanthenberemoved. 2.

<Cross-sectionimage>

– 28 –

<Installing the keys>

A code is indicated at the foot of each key.

CSA E G

DB F ABCDEFG

A C E G

B D F ABCDEFG

A C E G

B D F ABCDEFG

A C E G

B D F ABSC

Assemble a key to a hammer.

Set securely into the chassis.

Refer to the illustration below for the location of each white key.
Be sure to install each key at its designated location.
All black keys are the same. A black key may be installed at any correct black-key location.

Install a black key before installing the white keys on either of its sides.
Follow the same procedures below to install a black or white key.

Assemble a key to a hammer.1.
Presstheprotrusionofthechassisrmlyintothekeyhole.2.
Press the key to see if it moves properly.3.

– 29 –



Press down the resin part.

Fulcrum point

Tweezers

Removing the hammers

Place the chassis upside down so that the hammers are visible.1.
Press the chassis with the tip of tweezers.2.
Whilecatchingahammerwithtweezers,setthetweezersagainsttheresinpartofthechassis.3.
Using the chassis-tweezer contact as a fulcrum point, press down against the resin part in the direction 4.
of the red arrow in the illustration below, and then disengage the hammer.

You must press the resin part of the hammer.NOTE:
Pressing on the metal part of the hammer may damage the area connected to the resin.NOTE:

– 30 –

<About the hammers>

Type of Hammer (for a white key)

Hammer Code (for a white key)

Hammer Code (for a black key)

Type of Hammer (for a black key)

W1 (13 keys)

<Hammers for white keys>

<Hammers for black keys>

B1 (9 keys) B2 (9 keys) B3 (9 keys) B4 (9 keys)

W2 (13 keys) W3 (13 keys) W4 (13 keys)

There are several kinds of hammers.

The type of a hammer may be identied by the code engraved on it.

Type of Hammer: "W" for a white key, "B" for a black key.
Hammer Code: The hammers for white keys are coded W1, W2, W3, and W4.
The hammers for black keys are coded B1, B2, B3, and W4.

<Location to install the hammer>

A hammer must be installed at the correct location according to its type.
The combination of hammers and keys are shown below.

– 31 –

<Installing the hammers>

Press down against the metal part.

Fulcrum point

Tweezers

Locked at this point

Be sure to install each hammer at its designated location. If a hammer does not move smoothly, check
if it is installed at the correct location.

Follow the same procedures shown below to install a hammer for both black and white keys.

Use the tweezers to set a hammer at its correct location.1.
Press the chassis with the tip of tweezers.2.
Using the chassis-tweezers contact as a fulcrum point, press down the metal part of the hammer in 3.
the direction of the red arrow in the illustration below, and then install the hammer.

– 32 –



Nonwoven tape

MACP-KYC1 PCB MACP-KYD1 PCB MACP-KYC2 PCB

Removing the keyboard PCBs (MACP-KYC1/KYC2, KYD1)

Remove eight rubber keys.1.

One rubber key is shorter than the others.NOTE:

Rubber keys Short rubber key

Rubber keys

Short rubber key

Remove the nonwoven tape.2.
Remove 23 screws.3.

– 33 –

Locate the FFC connected on the back of the MACP-KYD1 PCB. Unlock the connector to remove the 4.

MACP-KYC1 PCB MACP-KYD1 PCB

MACP-KYD1 PCB

MACP-KYC2 PCB

FFC, and then disengage the MACP-KYC1 PCB, the KYC2 PCB, and the MACP-KYD1 PCB.

FFC

– 34 –

<Installing the keyboard PCBs (MACP-KYC1/KYC2, KYD1)>

Connect the FFC to the MACP-KYD1 PCB and lock the connector. 1.
Be sure to connect it securely.

FFC

Install eight rubber keys. 2.
Be sure to install the short rubber key at the correct location.

LightlyinsertthetipofarubberkeyintothePCBrst,andthen,pressitinusingtheendofapaper

clip. Do not press the rubber key forcefully to avoid damaging the rubber key.

Secure the MACP-KYC1 PCB, the KYC2 PCB, and the MACP-KYD1 PCB with 23 screws. 3.
Press the PCBs lightly in the direction of the red arrow in the illustration below while tightening a
screw.

– 35 –



Nonwoven tape

MACP-KYA1 PCB MACP-KYA2 PCB MACP-KYB1 PCB MACP-KYB2 PCB

MACP-KYB1 PCB

FFC

<If the PLANN comes off>
Nhe PLANN is a transparent plastic plate. If the plate comes off, put it on the place where the FFC is,

and insert its end into place where the blue line is shown in the image.

Removing the keyboard PCBs (MACP-KYA1/KYA2, KYB1/KYB2)

Remove the nonwoven tape. Unlock the connector and disengage the FFC connecting the MACP-1.
KYA2 PCB and the MACP-KYB1.

FFC

Remove 26 screws.2.

Unlock the connector and disengage the FFC connected to the MACP-KYB1 PCB.3.

When removing the FFC, be careful not to pull it too much in the direction of the red arrow in NNNNN
the illustration, or the PLANN on the back may come loose.

– 36 –

Remove the keyboard PCBs (MACP-KYA1/KYA2, KYB1/KYB2).4.

MACP-KYA2 PCB MACP-KYA1 PCB

MACP-KYB1 PCBMACP-KYB2 PCB

Remove eight rubber keys.5.

One rubber key is shorter than the others.NOTE:

Rubber keys Short rubber key

Rubber keys

Short rubber key

–37–

<Installing the keyboard PCBs (MACP-KYA1/KYA2, KYB1/KYB2)>

Place eight rubber keys on the chassis. 1.
Be sure to place the short rubber key in the correct location.

Connect the FFC to the MACP-KYB1 PCB and lock the connector.2.

When connecting the FFC, be careful not to pull it too much in the direction of the red arrow NNNNN
in the illustration, or the PLANN on the back may come loose.

FFC

MACP-KYB1 PCB

<If the PLANN comes off>
Nhe PLANN is a transparent plastic plate. If the plate comes off, put it on the place where the FFC

is, and insert its end into place where the blue line is shown in the image.

– 38 –

Insert the MACP-KYA1/KYA2 PCB and MACP-KYB1/KYB2 PCB at an angle against the chassis, 3.

1

2

and place them while paying attention not to misalign the rubber keys.

WhileplacingthePCBs,thecontactwiththerubberkeysmaycomeoutofalignment.Alignthem4.
against the red dotted line in the illustration below, lift the PCB once in the direction of the red
arrow, and then place them again.

Secure the MACP-KYA1/KYA2 PCBs, and the MACP-KYB1/KYB2 PCBs with 26 screws. 5.
Press the PCBs lightly in the direction of the red arrow in the illustration below while tightening a
screw.

– 39 –

DIAGNOsTIC PROGRAM

No. Test Items Note

1 Automatic Test

RAM, ROM, LED
(Performed at the launch of the diagnostic program)

sequential Test

2 Model check
3 ROM Version check Internal, External
4 Button check
5 Pedal check Pedal
6 Headphones check Headphones
7 USB check PC, USB cable
8 SD Card check SD Card
9 Key check

single Test

10 Flash Memory check

Initial setting

Connect the AC adaptor.1.
Connect the pedal.2.
Even if a pedal unit is unavailable for the test, all the tests except for the pedal check may be performed.
"Main" volume: MAX3.
Have a PC and a USB cable ready. (They will be used in the USB check.)4.

OperatingSystem: Windows
   WindowsVista

Mac OS® X (10.3.9, 10.4.11 or later, 10.5.6 or later)

   *1:WindowsXPHomeEdition/WindowsXPProfessional(32bit)
   *2:WindowsVista(32bit)

how to start the diagnostic program

®

XP (SP2 or later) *1

®

*2

Hold down the "METRONOME", "RECORDER", and "SONG (1.
the power ON.
Release the 2.
After the diagnostic program is launched, Automatic Test will start. 3.
Select Sequential Test or Single Test after Automatic Test is completed.

Besuretoturnoffthepowerwhenthetestisnished.

"METRONOME", "RECORDER", and "SONG (u/n)

/n)" buttons at the same time, to turn

u

" buttons.

Test Items

This diagnostic program tests the following items.
Selecting the "2. Model check" will run Test 2 (Model check) through 9 (Key check) in sequence.
The "10. Flash Memory check" is a single test. (see page 46)

– 40 –

Diagnostic program

1. Automatic Test

Automatic Test is performed each time the diagnostic program is launched.

RAM check and ROM check are performed. 1.
If a test fails, the "

SONG (u/n)" LED or the "L/R" LED illuminates.

LED check is performed. 2.

TheconrmationchordsC4,E4,G4sound,andtheLEDsilluminateintheorderindicatedwiththe

blue arrow as shown in the illustration below.
The LEDs illuminate repeatedly until the "2. Model check" is performed.

2. Model check

Press the "FUNCTION" button to perform the "MODEL check".1.

TheconrmationchordsC4,E4,G4sound.
IfthemodelisAP-420,the"ELECPIANO"LEDashes.

– 41 –

3. ROM Version check (Internal/External)

sequence Display LED status

1 (0) All LEDs OFF
2 (1) "ELEC PIANO" LED
3 (0) All LEDs OFF
4 (0) All LEDs OFF
5 ― Stand-by status as in Step 1

*WhiletheinternalROMversionisindicated,the"L"LEDkeepsashing.

<LEDsonstand-by>

The numbers necessary in the ROM version check are expressed by the combination of the illuminated LEDs.

<CombinationsofLEDs>

0:AllLEDsOFF    5:"ELECPIANO"+"MODERN"LED
1:"ELECPIANO"LED   6:"MODERN"+"CLASSIC"LED
2:"CLASSIC"LED    7:"MODERN"+"CLASSIC"+"ELECPIANO"LED
3:"ELECPIANO"+"CLASSIC"LED  8:"RECORDER"LED
4:"MODERN"LED    9:"ELECPIANO"+"RECORDER"LED

Press the "FUNCTION" button to perform the "ROM Version check 1.

(Internal)".TheconrmationchordsC4,E4,G4sound.

The "ELEC PIANO", "CLASSIC", "MODERN", "RECORDER" LEDs

illuminateandthe"L"LEDasheswhileonstand-by.

* If you don’t wish to perform the "ROM version check (Internal)", go on

to the step (3).

Each time you press the "2.
Check to see if the LEDs illuminate in the order shown below.

InternalROM(0100):0→1→0→0→Stand-bymode

SONG (u/n)" button, the status of the LEDs changes.

– 42 –

Press the "FUNCTION" button to perform the "ROM Version check 3.

(External)".TheconrmationchordsC4,E4,G4sound.

The "ELEC PIANO", "CLASSIC", "MODERN", "RECORDER" LEDs

illuminateandthe"R"LEDasheswhileonstand-by.

* If you don’t wish to perform the "ROM version check (External)", go on

to the step (1) of the "4. Button check".

<LEDsonstand-by>

Each time you press the "4.

SONG (u/n)" button, the status of the LEDs changes.

Check to see if the LEDs illuminate in the order shown below.

ExternalROM(0100):0→1→0→0→Stand-bymode

sequence Display LED status

1 (0) All LEDs OFF
2 (1) "ELEC PIANO" LED
3 (0) All LEDs OFF
4 (0) All LEDs OFF
5 ― Stand-by status as in Step 3

*WhiletheexternalROMversionisindicated,the"R"LEDkeepsashing.

– 43 –

4. Button check

Press the "FUNCTION" button to perform the "BUTTON check".1.

TheconrmationchordsC4,E4,G4sound,andallLEDsturnoff.

Press the buttons in the order indicated in the illustration on the bottom.2.

Eachtimethebuttonispressed,theconrmationchordC6sounds.

If a button is not operating properly or a button is pressed in a wrong order, an error tone (F2) sounds.
* You cannot cancel this test procedure mid-way.

Whenthe"ELECPIANO"buttonispressedattheend,theconrmationchordsC4,E4,G4soundand3.
all LEDs turn off.

5. Pedal check

<Aboutthepedalunit>

If there is no pedal unit for testing, go on to the "6. Headphones check".

Press the "SOFT" pedal.1.

TheconrmationchordE4soundsand"MODERN"LEDlights.

Press the "SOSTENUTO" pedal.2.

TheconrmationchordG4soundsand"CLASSIC"LEDlights.

Press the "DAMPER" pedal (ON HALF).3.

TheconrmationchordC4soundsand"ELECPIANO"LEDashes.

Pressthe"DAMPER"pedalrmly(ONFULL).4.

TheconrmationchordC4soundsand"ELECPIANO"LEDlights.

– 44 –

6. headphones check

Press the "FUNCTION" button to perform the "Headphones check".1.

TheconrmationchordsC4,E4,G4soundandthe"L"LEDlights.

Connect the headphones to the jack in the front of the main unit. 2.
"L" LED turns off and the "R" LED illuminates.
Check to see if you can hear test sound from the headphones by pressing the "A4" key.3.
Remove the headphones from the jack. 4.
"R" LED turns off and the "L" LED illuminates.
Connect the headphones to the jack in the back of the main unit. 5.
"L" LED turns off and the "R" LED illuminates.
Check to see if you can hear test sound from the headphones by pressing the "A4" key.6.
Remove the headphones from the jack. 7.
"R" LED turns off and the "L" LED illuminates.

7. UsB check

Press the "FUNCTION" button to perform the "USB check".1.

TheconrmationchordsC4,E4,G4sound.

Connect AP-420 to the PC with a USB cable.2.
Press the "MODERN" button.3.

WhentheUSBcheckcompletes,the"R"LEDwilllightandtheconrmationchordC6sounds.

Disconnect the USB cable.4.

8. sD Card check

Press the "FUNCTION" button to perform the "SD Card check".1.
Insert an SD card into the SD card slot.2.
Press the "MODERN" button. 3.

WhentheSDCardcheckcompletes,the"R"LEDwilllightandtheconrmationchordC6sounds.

Remove the SD card.4.

– 45 –

9. Key check

Press the "FUNCTION" button. 1.

TheconrmationchordsC4,E4,G4sound.

Press the "FUNCTION" button.2.

TheconrmationchordsC4,E4,G4soundtwice.

Press the "FUNCTION" button to perform the "Key check".3.
Conrmthatatesttone(approx.500Hz)soundsfromtheleftspeakerwhileakeyispressedhalfway. 4.
Check all white and black keys.
Conrmthatatesttone(approx.500Hz)soundsfromtheleftspeakerandahigh-pitchedtesttone5.
(approx. 2 kHz) sounds from the right speaker while a key is pressed completely.
Check all white and black keys.
Pressthe"POWER"buttontoturnoffthepower.6.

10. flash Memory check

Boot the diagnostic program.1.
Hold down the "ELEC PIANO" button for 2 seconds. 2.

The"ELECPIANO"LEDilluminatesinstantaneously,andtheconrmationchordsC4,E4,G4sound.

Pressthe"POWER"buttontoturnoffthepower.3.

– 46 –

Operation after replacing the main PCB or the keyboard parts

Make sure to perform the following procedure after replacing the main PCB or the keyboard parts.
Applicable parts number on the Parts List: No.1 for the main PCB, No. 42 to 74 for the KY-ASSY
or the KY-ASSY component parts

Procedure

Hold down the "FUNCTION", "METRONOME", and "ELEC PIANO" buttons 1.
at the same time, to turn the power ON.
All LEDs are lit.

Release the "FUNCTION", "METRONOME", and "ELEC PIANO" buttons. 2.
All the LEDs turn off except "L" and "R" LEDs.

Press the "METRONOME" button. 3.
The "R" and "MODERN" LEDs are lit.

Press the "MODERN" button. 4.
The "R" and "CLASSIC" LEDs are lit.

Press the "CLASSIC" button. 5.
The "R" and "ELEC PIANO" LEDs are lit.

Press the "ELEC PIANO" button. 6.
The LEDs on both side of the "SONG (u/n)" mark, the "R" LED, and the
"ELEC PIANO" LED are lit.

Press the "RECORDER" and "METRONOME" buttons at the same time. 7.

Press the "POWER" button to turn off the power.8.

– 47 –

41

38

39

39

40

32

32

31

31

32

19

20

32

37

36

22

7

6

11

11

10

9

8

19

21

23

22

24

33

20

24

23

33

26

29

21

1

2

25

28

27

18

34

35

16

17

15

3

5

30

30

4

13

12

14

40

EXPLODED VIEW

– 48 –

KEY ASSY

STAND

58

42

61

64

44

59

63

62

65

68

52

55

54

67

53

66

56

46

51

52

57

45

60

43

48

50

76

77

78

79

80

79

81

47

49

73

69

72

74

69

70

74

73

71

72

71

75

82

83

84

86

× 4
× 6

× 2
× 2

× 2
× 4

× 2

80

81

85

× 1

× 1

× 1

– 49 –

PARTs LIsT

AP-420

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specicationsaresubjecttochange

without prior notice.

2. As for spare parts order and supply, refer to the
"GUIDEBOOK for Spare parts Supply", published
separately.

3. The numbers in item column correspond to the
same numbers in drawing.

– 50 –

1: AP-420_BLACK_DI
2: AP-420_BLACK_EU
3: AP-420_BLACK_UK
4: AP-420_BLACK_US

5: AP-420_BROWN_DI
6: AP-420_BROWN_EU
7: AP-420_BROWN_UK
8: AP-420_BROWN_US

Specification R

MAIN PCB

N 1 10346497 PCB ASSY/MDA1 TK-RJM509871*001 11111111 AMain PCB

CN9 10257512 CONNECTOR UBR23-4K5G00 11111111 AT CUSB Port
D31 10276977 DIODE L1SS400T1G 11111111 AA C
IC13 10256338 IC CS4351-CZZR 11111111 AS C

IC1 10241413 IC R1151N001C-TR-F 11111111 AE C

IC12 10197808 IC TC7SZ08FU(TE85L.F) 11111111 AE C

IC4 10197554 IC TC7SZ126FU(TE85L.F 11111111 AE C
IC5 10255468 LSI MB91F036PFF-GE1 11111111 CB C

IC14 10333782 LSI UPD65943GK-F659EUA 11111111 AV C

IC2 10333111 MEMORY MD56V82160-6TAZ03B 11111111 BJ C
IC6 10333112 MEMORY S29GL256P90TFCR20D 11111111 BU C
L39 10193074 COIL DLW21HN181SQ2L 11111111 AC C

Q1-Q3,Q8,Q9 69409403 TRANSISTOR 2SA1576AT106R 55555555 AA C

Q7 22592764 TRANSISTOR 2SB1188T100Q 11111111 AB C

Q4-Q6,Q10 69300298 TRANSISTOR 2SC4081T106R 44444444 AA C

X1,X31 10334293 RESONATOR 9C12000163 22222222 AG C

PSA1 PCB

N 2 10346498 PCB ASSY/PSA1 TK-RJM509876*001 11111111 BPSA1 PCB

IC3 10257492 IC NJM78M12FA 11111111 AE C
IC1 10201503 IC PQ1CG21H2FZH 11111111AO C
L14 10231919 COIL RB53-856396NP 11111111 AA C

L4 10231920 COIL RB53-856397NP 44444444 AA C
L9 10232457 COIL RII7-860400NP 11111111 AH C
J2 10342138 CONNECTOR LGP7031-0900FC 11111111 CDC Jack
L3 10342135 COIL 02249-T556 22222222 C
L6 10342335 COIL RP1315BNP-220M-T 44444444 C

D9,D10,D12 10276977 DIODE L1SS400T1G 33333333 AA C

D15,D16 10308381 DIODE LUDZS7.5BT1G 22222222 AA C

D4 10210387 DIODE RSX101VA-30TR 11111111 AA C

IC5,IC7,IC9,IC11 10211950 IC NJM2068M-D(TE1) 44444444AC C

Q4-Q12 69300298 TRANSISTOR 2SC4081T106R 99999999 AA C

Q15,Q16 10305853 TRANSISTOR KTD1304-RTK/P 22222222 AB C

D11 10334295 DIODE LUDZS12BT1G 11111111 AA C

IC2 10335105 LSI R2A15108SP-W00T 11111111 AZ C

D3 10342143 DIODE RB075B40STL 11111111 C

IC4 10343240 IC BH3544F-E2 11111111 C

12345678

QTY

Price

Code

RemarksN Item Parts No. Parts Name

CASE UNIT

N 3 10346492 CASE ASSY/MAIN TK-RJM509476*001 1111 CBlack
N 3 10346493 CASE ASSY/MAIN TK-RJM509476*002 1111 CBrown
N 4 10346500 BOARD ASSY/FRONT TK-RJM509461*002 1111 CBlack
N 4 10346501 BOARD ASSY/FRONT TK-RJM509461*003 1111 CBrown

5 10346502 PCB ASSY/HPA2 TK-RJM509668*002 11111111 CHPA2 PCB

D701 10203050 LED 231XHD 11111111 AA CPower Lamp

– 51 –

1: AP-420_BLACK_DI
2: AP-420_BLACK_EU
3: AP-420_BLACK_UK
4: AP-420_BLACK_US

5: AP-420_BROWN_DI
6: AP-420_BROWN_EU
7: AP-420_BROWN_UK
8: AP-420_BROWN_US

Specification R

6 10341204 SIDE UNIT/RIGHT TK-RJM509305*001 11111111 C
7 69245260 BUTTON/POWER M340318-001 11111111 AA C
8 10334364 SIDE BLOCK/RIGHT RJM509281-001 11111111 AP C

9 10334406 SWITCH SDDLD1017U 11111111 AU C
10 10336251 HARNESS TD-EH3P105M902 11111111 AP C
11 10294363 BRACKET/RIGHT RJM508404-001 22222222 AD C
12 10346494 SIDE UNIT/LEFT TK-RJM509763*001 11111111 C
13 10342256 KNOB/RTR M341402-001 11111111 C
14 10337986 SIDE BLOCK/LEFT RJM509280-003 11111111 C
15 10337975 KEY/RUBBER RJM509282-003 11111111 C

N 16 10346503 PCB ASSY/CNA TK-RJM509881*001 11111111 CCNA PCBs

VR601 69308726 VARIABLE R RK09K12C0D0W 11111111 AH CVolume

SW601-SW607 10336115 SWITCH TP-1138A-10-160GF 77777777AC C

D601,D603-D609 10336974 LED 26-21/R1 88888888 AD X

D602 10336975 LED 26-21/Y1 11111111 AF X

17 10346504 PCB ASSY/HPA1 TK-RJM509665*002 11111111 CHPA1 PCB

J701 10171449 CONNECTOR JY-6360*04-070 22222222 AE CHeadphone Jack

L701 10231919 COIL RB53-856396NP 22222222 AA C

N 18 10346499 PCB ASSY/JKA1 TK-RJM509879*001 11111111 CJKA1 PCB

J503 10206815 CONNECTOR JY-6314*01-030 11111111 AC CLine Out (L/MONO)
J504 10206816 CONNECTOR JY-6314*01-130 11111111 AA CLine Out (R)

L503-L504 10231920 COIL RB53-856397NP 22222222 AA C

19 10305155 SPEAKER C05JT02 22222222 BI CTweeters
20 10309720 HARNESS PH-2P-61-M334 22222222 AG C
21 10256315 BRACKET/TW RJM507322-001 22222222 AX C
22 10337993 SPEAKER C12J08 22222222 CSpeakers
23 10265693 HARNESS EH-2P-55-M332 22222222 C
24 10052226 NET/SPEAKER M441205-001 22222222 AC C
25 10337922 BRACKET/MDL RJM509526-001 11111111 X
26 10337923 BRACKET/MDR RJM509527-001 11111111 X
27 10337925 BRACKET/PSL RJM509544-001 11111111 X
28 10337927 BRACKET/PSR RJM509513-001 11111111 X
29 10204256 FERRITE CORE TRCN16-13 11111111AW X
30 10269833 FOOT/RUBBER RJM507817-001 22222222 AA C
31 10337932 BRACKET RJM509522-001 44444444 X
32 10337918 HIMELON/5X30 M440583-003 44444444 X
33 10184475 STOPPER RJM505299-001 22222222 AB C

N 34 10346495 PANEL ASSY/CONSOLE TK-RJM509478*001 11111111 C

35 10337938 KEY FELT RJM509922-001 11111111 C
36 10310734 PCB ASSY/SDA1 TK-RJM508899*001 11111111 BV CSDA1 PCB

37 10337928 BRACKET/SD RJM509516-001 11111111 C
N 38 10346490 COVER ASSY/KEY TK-RJM509450*002 1111 CBlack
N 38 10346457 COVER ASSY/KEY TK-RJM509450*001 1111 CBrown

39 10337936 GEAR RJM509608-001 22222222 C

40 10211851 SLIDE CAP RJM505899-001
N 41 10346491 BOARD ASSY/TOP TK-RJM509454*002 1111 CBlack
N 41 10346458 BOARD ASSY/TOP TK-RJM509454*001 1111 CBrown

12345678

22222222 AA C

QTY

Price

Code

RemarksN Item Parts No. Parts Name

– 52 –

1: AP-420_BLACK_DI
2: AP-420_BLACK_EU
3: AP-420_BLACK_UK
4: AP-420_BLACK_US

5: AP-420_BROWN_DI
6: AP-420_BROWN_EU
7: AP-420_BROWN_UK
8: AP-420_BROWN_US

Specification R

KEY BOARD

42 10348588 KEY ASSY TK-RJM510156*004 11111111 A

43 10340880 PCB ASSY/KEY TK-RJM509609*001 11111111 CKYC,KYD PCBs

D601-D628 10301580 DIODE LM1MA142WAT1G 28 28 28 28 28 28 28 28 AA X
D801-D818 10301580 DIODE LM1MA142WAT1G 18 18 18 18 18 18 18 18 AA X

44 10334333 RUBBER/KEY/AG1 RJM509219-001 77777777 AC C

45 10334334 RUBBER/KEY/GC1 RJM509220-001 11111111 AA C

46 10336108 CABLE UL2896-30-265-MACP 11111111 C

47 10341198 PCB ASSY/KYA TK-RJM509622*001 11111111 CKYA PCBs

D601-D644 10294400 DIODE LM1MA142WKT1G 44 44 44 44 44 44 44 44 AA X

48 10341199 PCB ASSY/KYB TK-RJM509624*001 11111111 CKYB PCBs

D801-D844 10294400 DIODE LM1MA142WKT1G 44 44 44 44 44 44 44 44 AA X

49 10334331 RUBBER/KEY/AG2 RJM509217-001 77777777 AD C

50 10334332 RUBBER/KEY/GC2 RJM509218-001 11111111 AA C

51 10336109 CABLE UL2896-20-280-MACP 11111111 C

52 10164446 HIMELON/20-120 RJM502073-002 22222222 AA X

53 10334298 HIMELON/15X270 M411937-001 11111111 AD X

54 10336111 CABLE UL2896-20-120-MACP 11111111 AO C

55 10337877 BLACK KEY RJM502797-003V02 36 36 36 36 36 36 36 36 C

56 10338011 WHITE KEY/B RJM502794-003V03 11111111 C

57 10338012 WHITE KEY/CEGB RJM502862-003V03 77777777 C

58 10338013 WHITE KEY/DFA RJM502863-003V03 77777777 C

59 10338014 WHITE KEY/SA RJM502795-004V03 11111111 C

60 10338015 WHITE KEY/SC RJM502796-004V03 11111111 C

61 10341062 HAMMER ASSY/W1 TK-RJM509600*001 13 13 13 13 13 13 13 13 C

62 10341063 HAMMER ASSY/W2 TK-RJM509601*001 13 13 13 13 13 13 13 13 C

63 10341064 HAMMER ASSY/W3 TK-RJM509602*001 13 13 13 13 13 13 13 13 C

64 10341065 HAMMER ASSY/W4 TK-RJM509603*001 13 13 13 13 13 13 13 13 C

65 10341066 HAMMER ASSY/B1 TK-RJM509604*001 99999999 C

66 10341067 HAMMER ASSY/B2 TK-RJM509605*001 99999999 C

67 10341068 HAMMER ASSY/B3 TK-RJM509606*001 99999999 C

68 10341069 HAMMER ASSY/B4 TK-RJM509607*001 99999999 C

69 10306460 PLATE RJM505864-001 22222222 AA X

70 10343387 HIMELON/ACP RJM510100-001 11111111 AF X

71 10138691 FELT/KEY RJM503562-001 11111111 AF X

72 10334393 FELT/HAMMER RJM509655-001 11111111 BI X

73 10294093 FELT ASSY/KEY TK-RJM507910*001 11111111 CG X

74 10340855 FELT/KEY RJM510067-001 11111111 AV X

12345678

QTY

Price
Code

RemarksN Item Parts No. Parts Name

– 53 –

1: AP-420_BLACK_DI
2: AP-420_BLACK_EU
3: AP-420_BLACK_UK
4: AP-420_BLACK_US

5: AP-420_BROWN_DI
6: AP-420_BROWN_EU
7: AP-420_BROWN_UK
8: AP-420_BROWN_US

Specification R

STAND

N 75 10346485 SCREW SET TK-RJM509906*001 1111 CBlack
N 75 10346486 SCREW SET TK-RJM509906*002 1111 CBrown

76 10337997 BOARD/BACK RJM508304-011 1111 CBlack

76 10337996 BOARD/BACK RJM508304-010 1111 CBrown
N 77 10346505 BOARD ASSY/LEFT TK-RJM508738*007 1111 CBlack
N 77 10346506 BOARD ASSY/LEFT TK-RJM508738*008 1111 CBrown
N 78 10346507 BOARD ASSY/RIGHT TK-RJM508739*007 1111 CBlack
N 78 10346508 BOARD ASSY/RIGHT TK-RJM508739*008 1111 CBrown
N 79 10348901 FOOT ASSY TK-RJM508370*003 1111 CBlack
N 79 10348902 FOOT ASSY TK-RJM508370*004 1111 CBrown

80 10262360 FOOT RJM503826-003 44444444 X

81 10203751 SCREW/TRUMPET M441270-001 88888888 AA X
N 82 10346509 BOARD ASSY/PEDAL TK-RJM508301*006 1111 CBlack
N 82 10346510 BOARD ASSY/PEDAL TK-RJM508301*007 1111 CBrown
N 83 10346489 BOARD ASSY TK-RJM508302*009 1111 CBlack
N 83 10346456 BOARD ASSY TK-RJM508302*008 1111 CBrown

84 10263906 PEDAL ASSY TK-RJM507377*001 11111111 CL C

VR1 10257246 VARIABLE R XV09411N895Z5K1050 11111111 C

85 10339497 HARNESS EF-SMR5P155MP5 11111111 C

86 10260690 ADJUSTER FL-20-CR3-KE 11111111 AF X

ACCESSORY

X-1 10337866 AC ADAPTOR AD-E24250LW-P1 1 1 1 1 1 1 C
X-2 10347080 AC ADAPTOR AD-E24250LW-P2 1 1 C
X-3 10337904 CORD SET UC2LT-M003A 1 1 1 1 C US type
X-4 10318804 CORD EC2LT-M001A 1 1 1 1 C EU type
X-5 10318806 CORD BC2LT-M001A 1 1 C UK type

X-6 10318805 CORD KC2LT-M001A 1 1 C Korea type
N X-7 10346487 STAND ASSY/MUSIC TK-RJM509511*001 1111 CBlack
N X-8 10346488 STAND ASSY/MUSIC TK-RJM509511*002 1111 CBrown

X-9 10337985 SEAT MX-CH11D-(D) 1 1 C Black

X-10 10337984 SEAT MX-CH11B-(D) 1 1 C Brown

12345678

QTY

Price

Code

RemarksN Item Parts No. Parts Name

– 54 –

Main PCB M900-MDA1 (1/2)

: Not used

(to CNA1/

CN601)

Not used

(to PSA1/CN16)

(toSDA1/CN751)USB

PEDAL

(to PDA1/CN1)

sChEMATIC DIAGRAMs

– 55 –

Main PCB M900-MDA1 (2/2)

(to KYB1/CN804)

: Not used

(to KYD1/CN802)

– 56 –

sub PCB M903-PsA1 (1/2)

(toPOWERSWITCH)

(to HPA2/

CN702)

(to LEFT

SPEAKER)

(to LEFT

TWEETER)

(to RIGHT

TWEETER)

(to RIGHT

SPEAKER)

(to JKA1/

CN503)

(to CNA2/602)

(to MDA1/

CN12)
Not used:
10 to 12 pin

(to HPA1/CN701)

: Not used

–57–

sub PCB M903-PsA1 (2/2)

: Not used

– 58 –

Console PCB M902-CNA1/Volume PCB M902-CNA2

: Not used

(to PSA1/CN14)

(to MDA1/CN4)

– 59 –

Jack PCB M902-hPA1 Jack PCB M901-JKA1

(to PSA1/CN13)

LINE OUT

(toPSA1/CN17)

– 60 –

sD Card PCB M810-sDA1

(toMDA1/CN7)

(to PSA1/CN4)

(to PDA2/

CN3)

(to PDA1/

CN2)

(to MDA1/CN5)

Power Lamp PCB M902-hPA2

Pedal PCB M332-PDA1/M332-PDA2

– 61 –

Keyboard PCB MACP-KYA1

(to KYA2/CN602)

– 62 –

Keyboard PCB MACP-KYA2

(to KYA1/CN601)

(to KYB1/CN801)

– 63 –

Keyboard PCB MACP-KYB1

(to KYA2/CN603)

(to MDA1/CN1)

(to KYB2/CN803)

– 64 –

Keyboard PCB MACP-KYB2

(to KYB1/CN802)

– 65 –

Keyboard PCB MACP-KYC1

(to KYD1/CN801)

– 66 –

Keyboard PCB MACP-KYC2

(to KYD1/CN803)

–67–

Keyboard PCB MACP-KYD1

(to KYC1/CN601)

(to MDA1/CN2)

(to KYC2/CN602)

– 68 –

Ver. 1 : Oct. 2009

 •CorrectionoftheCONTENTS

 •CorrectionoftheDISASSEMBLY(P36,P38)

 •CorrectionoftheDIAGNOSTICPROGRAM(P47)

 •CorrectionofthePARTSLIST(P53)

Ver.2: Nov.2009

 •CorrectionoftheDISASSEMBLY(P31)

Ver. 3 : Sep. 2011

 •CorrectionofthePARTSLIST(P53)

CASIO COMPUTER CO.,LTD.

Overseas Service Division

6-2, Hon-machi 1-Chome

Shibuya-ku, Tokyo 151-8543, Japan