Acoustic research a 04 service manual
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Page 1
ELECTRONICS
SERVICE MANUAL
A-04
r Amplifier
TABLE OF CONTENTS
Bias Adjustment .................................................. 1
Schematic Diagram ............................................ 2
Wiring Diagram ................................................... 3
Disassembly Diagram ......................................... 4
Repair Parts List ................................................. 5
Specifications ...................................................... 5
NTELEDYNE ACOIBTIC RESEARCH
330 Turnpike Street. Canton,
Massachusetts 02021, USA
High Street, Houghton Regis, Dunstable,
Bedfordshire LU5 50d, England
AI
ACOUSTIC
RESEARCH
Page 2
Hut-r
l lmn-
Maw:
Planar»: r
Bias Adjustment
Instruments: DC milli-voltmeter
Notes: Prior to Bias Adjustment, run about 5 minutes with rated output (8 ohm) and warm up Power Transistor and Heat Sink.
Set Volume COntroI to Mininum.
Coupling
Step Adjust Adjust for
Plus Lead Minus Lead
1 TP3 TP1 VR601 DC mull-voltmeter
reads 3.0mV
2 TP2 Tp4 VR602