Yamaha PSR-S550 Service Manual

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SERVICE MANUAL
HAMAMATSU, JAPAN
Copyright (c) Yamaha Corporation. All rights reserved. ’08.08
PK 001810
CONTENTS(目次)
SPECIFICATIONS..................................................................... 3
PANEL LAYOUT ........................................................................ 4
CIRCUIT BOARD LAYOUT & WIRING
................................... 6
EXTENSION CABLE FOR SERVICE USE
.............................................. 7
BLOCK DIAGRAM........................... 8
DISASSEMBLY PROCEDURE.............................. 9
LSI PIN DESCRIPTION ............................. 16
IC BLOCK DIAGRAM   20
CIRCUIT BOARDS...................................... 21
TEST PROGRAM ................................................................... 33
INITIALIZATION ...................................................................... 37
DATA BACKUP ........................................................................ 38
SYSTEM BOOTING FLOW CHART ....................................... 43
MIDI IMPLEMENTATION CHART
 ..................... 44
MIDI DATA FORMAT ............................................................... 45
PA RTS LIST
OVERALL CIRCUIT DIAGRAM
PSR-S550 PSR-S550B