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Yamaha Portable Grand DGX-220 User Manual

Yamaha Portable Grand DGX-220
52 pages
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SERVICE MANUAL
HAMAMATSU, JAPAN
Copyright (c) Yamaha Corporation. All rights reserved. PDF ’06.04
PK 001761
CONTENTS
SPECIFICATIONS .................................................................... 3
PANEL LAYOUT........................................................................ 4
CIRCUIT BOARD LAYOUT & WIRING ..................................... 6
BLOCK DIAGRAM .................................................................... 8
DISASSEMBLY PROCEDURE ................................................. 9
LSI PIN DESCRIPTION .......................................................... 15
IC BLOCK DIAGRAM.............................................................. 18
CIRCUIT BOARDS ................................................................. 19
TEST PROGRAM ................................................................... 29
INITIALIZATION ...................................................................... 33
USER DATA BACKUP............................................................. 34
MIDI IMPLEMENTATION CHART ........................................... 35
MIDI DATA FORMAT ............................................................... 36
PARTS LIST
OVERALL CIRCUIT DIAGRAM
DGX-220
YPG-225
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Yamaha Portable Grand DGX-220 Specifications

General IconGeneral
Number of Keys76
Touch SensitivityYes
Polyphony32
Voices489
Styles150
DisplayBacklit LCD
Amplifiers6W + 6W
Speakers12cm x 2 + 3cm x 2
EffectsReverb, Chorus, DSP
MIDIYes
USBYes (To Host)
Power SupplyPA-5D AC Adapter
ConnectivityHeadphone Jack, Sustain Pedal Jack, USB to Host
Weight8.3 kg
Songs30 + 70 on CD-ROM

Summary

Specifications

Panel Layout

Block Diagram

Disassembly Procedure

Lower Case Disassembly

Procedure for removing the lower case assembly and battery cover.

Spring Terminal Removal

Steps to remove spring terminals from the lower case assembly.

TWL/TWR and Speaker Disassembly

Procedure to remove TWL, TWR circuit boards, and speakers.

PB Circuit Board Disassembly

Procedure to remove the PB (AMJK 6/6) circuit board.

DMLCD/LCD Unit Disassembly

Procedure to remove the DMLCD circuit board and LCD unit.

AM Circuit Boards Disassembly

Procedure to remove AM, AMJK 4/6, AMJK 5/6 circuit boards.

MK-76L/MK-76H Circuit Boards Disassembly

Procedure to remove MK-76L and MK-76H circuit boards.

IC Block Diagram

Test Program

Test Program Preparation

Required tools and setup for executing test programs.

Entering Test Program Mode

Instructions on how to access the test program mode.

Executing Test Procedures

Steps for running individual test items and interpreting results.

Test Program List and Judgment Criteria

Details of each test, including expected results and criteria.

Initialization

User Data Backup

Overall Circuit Diagram

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