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SERVICE MANUAL
HAMAMATSU, JAPAN
Copyright (c) Yamaha Corporation. All rights reserved. PDF
’06.03
/
PK
001760
CONTENTS
SPECIFICATIONS .................................................................... 3
PANEL LAYOUT ........................................................................ 4
CIRCUIT BOARD LAYOUT & WIRING ..................................... 6
BLOCK DIAGRAM .................................................................... 8
DISASSEMBLY PROCEDURE ................................................. 9
LSI PIN DESCRIPTION .......................................................... 20
IC BLOCK DIAGRAM .............................................................. 23
CIRCUIT BOARDS ................................................................. 24
TEST PROGRAM ................................................................... 33
INITIALIZATION ...................................................................... 37
USER DATA BACKUP ............................................................. 38
MIDI IMPLEMENTATION CHART ........................................... 42
MIDI DATA FORMAT ............................................................... 43
PARTS LIST
OVERALL CIRCUIT DIAGRAM
DGX-620
YPG-625