Casio CDP-120 Service Manual

CDP-120
– 9 –
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.

Casio CDP-120 Specifications

General

Sound effects	Reverberation
Number of speakers	2
Chorus effects quantity	5
Maximum polyphony (notes)	48
Reverberation effects quantity	10
USB version	2.0
USB connector type	USB Type-B
Keys quantity	88 keys
Product color	Black

Weight and Dimensions

Depth	286 mm
Width	1322 mm
Height	129 mm
Weight	11400 g

Summary

Specifications

Key Technical Specifications

Key technical specifications of the CDP-120 electronic keyboard, including features and dimensions.

Block and Wiring Diagram

System Component Interconnections

Illustrates the main components and their interconnections within the CDP-120 system.

PCB Information

Main PCB Components

Details of the Main PCB (M914-MDA1) and its primary components.

Power Amp PCB Components

Details of the Power Amp PCB (M914-PSA1) and its primary components.

Keyboard PCB Components

Details of the Keyboard PCBs (M914-KYA1, KYB1, KYC1) and their components.

Circuit Description

Key Matrix Logic

Explanation of the key matrix and contact logic for note detection.

Key and Button Identification

Key Labeling

Identifies keys with their note names (e.g., A0, C#1).

Button Functions

Maps buttons to their corresponding function or sound selection.

Printed Circuit Board Layouts

Main PCB Visuals

Visual representation of the Main PCB (M914-MDA1) component placement.

Power Amp PCB Visuals

Visual representation of the Power Amp PCB (M914-PSA1) component placement.

Keyboard PCB Visuals (Page 9)

M914-KYA1 Layout

Visual layout of the M914-KYA1 keyboard PCB.

M914-KYB1 Layout

Visual layout of the M914-KYB1 keyboard PCB.

Keyboard PCB Visuals (Page 10)

M914-KYC1 Layout

Visual layout of the M914-KYC1 keyboard PCB.

Disassembly Precautions

Safety and Preparation

Essential safety tips and preparation steps before disassembling the unit.

Disassembly - Panel Units (Part 1)

Removing Panel Units

Steps for removing the main panel unit from the chassis.

Disassembly - Panel Units (Part 2)

Panel Unit Disconnection

Steps for disconnecting FFCs and connectors from the main panel unit.

Disassembly - Side Cases

Removing Side Cases

Steps for removing the right and left side cases.

Disassembly - Inner Side Cases

Removing Inner Side Cases

Steps for removing the right and left inner side cases.

Disassembly - PCB Removal

Main PCB (M914-MDA1) Removal

Procedure for removing the main PCB.

Power Amp PCB (M914-PSA1) Removal

Procedure for removing the power amp PCB.

Disassembly - Speakers and Key-Assy

Speaker Removal

Steps for desoldering and removing the left and right speakers.

Key-Assy Removal

Initial steps for removing the keyboard assembly from the chassis.

Disassembly - Key-Assy Removal

Key-Assy Removal Procedure

Final steps for removing the keyboard assembly from the chassis.

Disassembly - Key Removal (Method)

Key Removal Tools and Method

Instructions and tool specifications for removing individual keys.

Disassembly - Key Removal (Procedure)

Key Removal Procedure

Detailed steps for inserting tools and lifting keys.

Key Installation

Key Installation Procedure

Steps for correctly installing keys back into the keyboard chassis.

Disassembly - Hammer Removal

Hammer Removal Method

Procedure for removing hammers using tweezers and a fulcrum point.

Hammer Identification and Placement

Hammer Types and Codes

Information on identifying hammer types by code and visual cues.

Hammer Installation Locations

Guide to correct placement of hammers based on type.

Hammer Installation

Hammer Installation Procedure

Steps for correctly installing hammers into the keyboard mechanism.

Disassembly - Keyboard PCBs

Keyboard PCB Removal

Steps for removing the keyboard PCBs from the unit.

Keyboard PCB Installation

Keyboard PCB Installation Procedure

Steps for reconnecting and securing the keyboard PCBs.

Diagnostic Program Overview

Preparation Steps

Procedures and requirements before starting the diagnostic program.

Starting the Diagnostic Program

How to enter and navigate the diagnostic mode.

Diagnostic Program - Test Procedures (Part 1)

Button Check Procedure

How to perform and interpret the button check.

ROM Version Check Procedure

How to perform and interpret the ROM version check.

ROM Checksum Test Procedure

How to perform and interpret the ROM checksum test.

Diagnostic Program - Test Procedures (Part 2)

Pedal Check Procedure

How to perform and interpret the pedal check.

USB Check Procedure

How to perform and interpret the USB connection check.

Exploded View Overview

Internal Component Diagram

Diagram showing the internal components of the CDP-120.

Exploded View - Keyboard Unit

Keyboard Unit Component Diagram

Detailed diagram of the keyboard unit components.

Parts List Overview

List of Replaceable Parts

List of all replaceable parts with their codes and specifications.

Parts List - PCB and Keyboard Units

Main and Power Amp PCB Parts

Parts list for the Main and Power Amp PCBs.

Keyboard PCB and Unit Parts

Parts list for Keyboard PCBs and keyboard unit components.

Parts List - Chassis and Accessories

Panel and Case Parts

Parts list for panel units, side panels, and main case components.

Accessories and Cords

List of accessories like music stand, pedal, AC adaptor, and cords.

Schematic Diagrams - Main PCB

Main PCB Schematic (M914-MDA1)

Detailed schematic of the Main PCB (M914-MDA1).

Schematic Diagrams - Power Amp PCB

Power Amp PCB Schematic (M914-PSA1)

Detailed schematic of the Power Amp PCB (M914-PSA1).

Schematic Diagrams - Keyboard PCB KYA1

Keyboard PCB Schematic (M914-KYA1)

Detailed schematic of the M914-KYA1 keyboard PCB.

Schematic Diagrams - Keyboard PCB KYB1

Keyboard PCB Schematic (M914-KYB1)

Detailed schematic of the M914-KYB1 keyboard PCB.

Schematic Diagrams - Keyboard PCB KYC1

Keyboard PCB Schematic (M914-KYC1)

Detailed schematic of the M914-KYC1 keyboard PCB.