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
（ユニットレイアウト及び結線図）................................... 6
EXTENSION CABLE FOR SERVICE USE
（サービス用延長ケーブル）.............................................. 7
BLOCK DIAGRAM（ブロックダイアグラム）........................... 8
DISASSEMBLY PROCEDURE（分解手順）.............................. 9
LSI PIN DESCRIPTION（LSI 端子機能表）............................. 16
IC BLOCK DIAGRAM （IC ブロック図）................................. 20
CIRCUIT BOARDS（シート基板図）...................................... 21
TEST PROGRAM ................................................................... 33
INITIALIZATION ...................................................................... 37
DATA BACKUP ........................................................................ 38
SYSTEM BOOTING FLOW CHART ....................................... 43
MIDI IMPLEMENTATION CHART
（MIDI インプリメンテーションチャート）..................... 44
MIDI DATA FORMAT ............................................................... 45
PA RTS LIST
OVERALL CIRCUIT DIAGRAM（総回路図）
PSR-S550 PSR-S550B
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