2
TABLE OF CONTENTS
PRODUCT OVERVIEW 3
OVERALL FREQUENCY RESPONSE 4
SERVICING NOTES AND DISCLAIMERS 5-6
SPECIFICATIONS 7
THE JBL LIMITED WARRANTY 8
TOOLS NECESSARY FOR SERVICE 9
SERVICE PROTOCOLS 10-11
A WORD ABOUT BALANCED AND UNBALANCED INPUTS 12
CONNECTOR WIRING/TYPICAL BENCH SETUP 13-14
SELECTIBLE INPUT SENSITIVITY 15
BLOCK DIAGRAM 16
THEORY AND CIRCUIT DESCRIPTIONS 17-25
POWER SUPPLY
INPUT BUFFER AMPLIFIER
LOW FREQUENCY PROCESSING
HIGH FREQUENCY PROCESSING
FINAL LOW FREQUENCY FILTER
LOW FREQUENCY OUTPUT AMPLIFIER
HIGH FREQUENCY OUTPUT AMPLIFIER
FAULT INDICATION CIRCUITRY
TROUBLESHOOTING GUIDE 26-45
FINAL TEST PROCEDURES 48
EXPLODED VIEWS AND GRAPHICS 49-51
WIRING DIAGRAM 52
SEMICONDUCTOR PINOUTS 53
PCB PICTORIALS 54-57
MASTER PARTS LIST 58
ELECTRONIC FAILURE QA CODES
SCHEMATICS
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