Acoustic research a 04 service manual

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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

-˜N-˜TELEDYNE 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