Yamaha PortaTone PSR-270 Manuale di servizio
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SERVICE MANUAL
■ ■ ■ ■ ■ CONTENTS
SPECIFICATIONS ...................................................................................... 3
PANEL LAYOUT ....................................................................................... 4
CIRCUIT BOARD LAYOUT ....................................................................... 5
BLOCK DIAGRAM .................................................................................... 6
DISASSEMBLY PROCEDURE ................................................................. 7
LSI PIN DESCRIPTION .......................................................................... 12
IC BLOCK DIAGRAM ............................................................................. 14
CIRCUIT BOARDS .................................................................................. 15
TEST PROGRAM & INITIALIZE ............................................................... 17
PANEL VOICE LIST ................................................................................. 19
GM VOICE LIST....................................................................................... 20
STYLE LIST ............................................................................................. 21
MIDI IMPLEMENTATION CHART ............................................................ 22
PARTS LIST
PANEL SWITCH TABLE
OVERALL CIRCUIT DIAGRAM
PK
001617
HAMAMATSU,JAPAN
1.95K-504 I Printed in Japan'99.03