Service manual

CONTENTS
SECTION PAGE
1 INTRODUCTION 15
2 CIRCUIT DESCRIPTION 15
2.1 GENERAL 15
2.2 POWER SUPPLY 15
2.3 KEYBOARD CIRCUIT 16
2.4 OSCILLATOR 18
2.5 BAND PASS FILTER 20
2.6 LOW PASS FILTER 20
2.7 VOLTAGE CONTROLLED AMPLIFIER 20
2.8 AMPLITUDE CONTOUR GENERATOR 21
2.9 FILTER CONTOUR GENERATOR 22
2.10 MODULATION OSCILLATOR 22
2.11 TOUCH SENSOR • 22
3 DISASSEMBLY, VISUAL INSPECTION AND REASSEMBLY 23
3.1 DISASSEMBLY 23
3.2 VISUAL INSPECTION 23
3.3 PRINTED CIRCUIT BOARD REMOVAL. 23
3.4 REASSEMBLY , 25
4 TUNING AND CALIBRATION PROCEDURES 25
4.1 GENERAL 25
4.2 OSCILLATOR TUNING 25
4.3 VOICE CALIBRATION 29
5 OPERATING CONTROLS, INDICATORS AND CONNECTORS 31
6 KEYBOARD MAINTENANCE AND ADJUSTMENT 34
6.1 CONTACTS 35
6.2 KEYS 35
6.3 TOUCH SENSOR
7 TROUBLESHOOTING GUIDE 37
7.1 POWER SUPPLY 37
7.2 SOUND CHAIN 38
7.3 CONTROL CIRCUITS 40
7.4 OSCILLATOR TUNING 41
8 MODIFICATIONS 42
8.1 SERVICE BULLETIN 802 42
8.2 TOUCH SENSOR BAR 42
8.3 INSTALLATION OF NEW OR REBUILT TOUCH SENSOR BAR 45
9 REPLACEMENT PARTS LIST 46
10 BLOCK AND SCHEMATIC DIAGRAMS 50
13