Yamaha PortaTone PSR-270 User Manual

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■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
SERVICE MANUAL
PK 001617
HAMAMATSU,JAPAN
1.95K-504 I Printed in Japan’99.03

Yamaha PortaTone PSR-270 Specifications

General

Voices	100
Styles	100
MIDI	Yes
Type	Portable Keyboard
Number of Keys	61
Effects	Reverb, Chorus, DSP
Display	LCD
Power Supply	PA-3B adapter
Tones	12
Connections	Headphone, MIDI In/Out, Sustain Pedal, DC In
Polyphony	32-note
Demo Songs	5