CASIO CDP-120 Service Manual

CDP-120

INDEX

JUL. 2011

CDP-120

ELECTRONIC KEYBOARD

Ver. 1 : Dec. 2012

CDP-120

SPECIFICATIONS

Keyboard 88-key piano keyboard

Touch Response 3 types, Off

Maximum Polyphony 48 notes (24 for certain tones)

Tones

Built-in Tones 5; with layer

Reverb 1 to 10, Off

Chorus 1 to 5, Off

Demo Songs 5 songs (tone demo songs)

Other Functions

Transpose ±1 octaves (-12 to +12 semitones) Tuning A4 = 415.5 to 465.9 Hz (Initial Default: 440.0 Hz)

MIDI 16 multi-timbre received, GM Level 1 standard

CDP-120

Inputs/Outputs

USB port TYPE B Damper Pedal jack Standard jack Phones/Output jack Stereo standard jack Output Impedance: 3 Ω, Output Voltage: 1.5 V (RMS) MAX

Power Jack 12 V DC

Power Supply

AC Adaptor AD-A12150LW Auto Power Off 30 minutes after last key operation, Auto Power Off can be disabled.

Speakers (12 cm × 6 cm oval) × 2

Output 8 W + 8 W

Power Consumption 12 V 18 W

Dimensions 132.2 × 28.6 × 12.9 cm (52 1/16 × 11 1/4 × 5 1/16 inch)

Weight Approximately 11.4 kg (25.1 lbs)

– 1 –

BLOCK AND WIRING DIAGRAM

CDP-120

KEYBOARD PCB (M914-KYA1)

MAIN PCB (M914-MDA1)

KI0~KI2, KC0, KC1

Filter

IC5

CN20 (5 pin)

CN801 (16 pin)

LOUT, ROUT

PEDAL, APO, POFF, MUTE, MIC IN

VA5

CN11 (11 pin)

KEYBOARD PCB (M914-KYB1)

CN802 (16 pin) CN804 (16 pin) CN805 (16 pin)

CN803 (30 pin)

CN14 (30 pin)

FI0~FI10, SI0~SI10, KC0~KC7

MPU

IC7

Power Supply Circuit

VD5

IC6, C24, C25,

C27, C33, C35

VD3

KEYBOARD PCB (M914-KYC1)

CN19 (4 pin)

MA1~MA22

MD0~MD15

USB

Flash Memory

(64 Mbit)

IC2

CN3 (11 pin)

VD5VA5

Power Supply Circuit

Power

IC3, Q4, D1,

Supply Circuit

C40~C45

IC3, Q4, D1

D2

DC 12 V (J3)

CN4 (5 pin)

PEDAL (J5)

POWER SWITCH (SW1)

VCP

BUTTONS

MAIN VOL. (VR1)

LOUT

ROUT

POWER AMP PCB (M914-PSA1)

PHONES (J2)

Headphones

Amplifier

IC1

Power

Amplifier

IC2

SPEAKER (L)

CN1 (2 pin)

CN2 (2 pin)

SPEAKER (R)

– 2 –

PCB INFORMATION

M914-MDA1M914-PSA1

M914-KYA1 M914-KYB1 M914-KYC1

Classiﬁ cation Parts Name PCB Name Components

Main PCB PCB UNIT/MAIN M914-MDA1

Power Amp PCB PCB UNIT/PSA1 M914-PSA1

M914-KYA1

M914-KYC1

Keyboard PCB

PCB UNIT/KY and

RUBBER CONTACT

MPU, Flash Memory (64 Mbit), Power Supply Circuit, Filter, USB Port

Power Supply Circuit, Power Ampli er Headphones Ampli er, Power Switch, Main Volume, DC 12 V Terminal, DAMPER PEDAL Jack, PHONES/OUTPUT Jack, Buttons

KeyboardM914-KYB1

CDP-120

– 3 –



KEY MATRIX

KC0 KC1 KC2 KC3 KC4 KC5 KC6 KC7

FI0 A0

SI0 A0

FI1 F1

SI1 F1

FI2 C2#

SI2 C2#

FI3 A2

SI3 A2

FI4 F3

SI4 F3

FI5 C4#

SI5 C4#

FI6 A4

SI6 A4

FI7 F5

SI7 F5

FI8 C6#

SI8 C6#

FI9 A6

SI9 A6

FI10 F7

SI10 F7

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

CIRCUIT DESCRIPTION

A0#

F1#

D2

A2#

F3#

D4

A4#

F5#

D6

A6#

F7#

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

B0

G1

D2#

B2

G3

D4#

B4

G5

D6#

B6

G7

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

C1

G1#

E2

C3

G3#

E4

C5

G5#

E6

C7

G7#

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

C1#

A1

F2

C3#

A3

F4

C5#

A5

F6

C7#

A7

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

D1

A1#

F2#

D3

A3#

F4#

D5

A5#

F6#

D7

A7#

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

D1#

B1

G2

D3#

B3

G4

D5#

B5

G6

D7#

B7

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

1

2

CDP-120

E1

1

E1

2

C2

1

C2

2

G2#

1

G2#

2

E3

1

E3

2

C4

1

C4

2

G4#

1

G4#

2

E5

1

E5

2

C6

1

C6

2

G6#

1

G6#

2

E7

1

E7

2

C8

1

C8

2

Each key has two contacts, the rst contact 1 and second contact 2.

NOTE: The diagram below illustrates how the contacts work.

Key

FI

Second contact



First contact



KC

SI

– 4 –



F#3G#3 A#3 C#4D#4 F#4G#4A#4 C#5D#5 F#5 G#5A#5

D#3

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

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

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

NOMENCLATURE OF KEYS

CDP-120

C1 D1 E1 F1 G1 A1 B1A0 B0



BUTTON MATRIX

C2 D2 E2 F2 G2 A2 B2 C3 D3 E3

SWI3 STRINGS GRAND PIANO 2

SWI4 GRAND PIANO 1 HARPSICHORD

SWI5 DEMO, FUNCTION

F3 G3 A3 B3 C4 D4 E4 F4 G4 A4 B4 C5 D5 E5 F5 G5 A5 B5 C6

SWO0 SWO1

ELEC PIANO

B6A6G6F6E6D6 C7

B7A7G7F7E7D7 C8

– 5 –

PRINTED CIRCUIT BOARDS

Main PCB: M914-MDA1 Power Amp PCB: M914-PSA1

CDP-120

– 6 –

Keyboard PCB: M914-KYA1

CDP-120

Keyboard PCB: M914-KYB1

– 7 –

Keyboard PCB: M914-KYC1

CDP-120

– 8 –

CDP-120

DISASSEMBLY



CAUTION

z

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

z

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

or blanket before starting disassembling.

z

There are several kinds of screws. Be sure to use the correct type of screws when reassembling. It is advisable to sort the screws as shown below after removing them.

z

If a screw cap is attached to a screw, be sure to reattach the screw cap when reassembling.



BEFORE STARTING REPAIR OR SERVICING

z

Remove the AC adaptor, AC cord or batteries.

z

Remove accessories such as the music stand.

– 9 –



DISASSEMBLY

A. REMOVE THE PANEL UNITS

Main panel unit Right panel unitLeft panel unit

A-1. Undo 10 or six screws on the bottom surface of the main unit.

NOTE: To remove only the main panel unit, undo six screws indicated with red circles in the

illustration below.

CDP-120

A-2. Undo eight or four screws and then remove eight or four LOWER-COVERs.

NOTE: To remove only the main panel unit, undo four screws and remove the four LOWER-

COVERs indicated with red circles in the illustration below.

A-3. You will see a screw inside when you remove an LOWER-COVER. Undo and remove the screw

through each opening (eight or four screws in total).

NOTE: Do not drop the screws inside the main unit.

NOTE: Do not touch the hammer with the screwdriver while loosening the screws.

LOWER-COVER

– 10 –

CASIO CDP-120 Service Manual

CDP-120

CONTENTS

SPECIFICATIONS

BLOCK AND WIRING DIAGRAM

PCB INFORMATION

CIRCUIT DESCRIPTION

PRINTED CIRCUIT BOARDS

DISASSEMBLY