Acoustic research Amplifier Tuner Recorder Service Manual

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acoustic research Amplifier Tuner Recorder Service Manual

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Page 1

ELECTRONICS
fl- SERVICE
MANUAL *

*TELEIWBE ACOUSTIC RESEARCH
10 American Drive. Norwood, MA 02062 USA

Page 2

II.

B.

D.

Description .................................. ....... .......

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2.
3.
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5.
6.

BiasingProcedure............................ ............

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2.

ModificationsandUpdates............................... .....

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TABLE OF CONTENTS

5

PhonoPreamplifier.....................................
ToneControl ..........................................
BalanceCu-cmt.
Drivel-Amplifier.......................................
PowerAmplifier
PowerSupply

InitialAdjustment......................................
DistortionMeasurements................................

clan u- NNHHI-II-I H 0-.

a:

+20VoltRegulator
BiasingUpdate.......... ..........
+39VoltLeadDr$s
DriverBoard
PhonoPreamplifier.....................................
ToneControlBoard.....................................
Turn-OnNoise.................... .....
RadioFrequencyInterference(RFI).......................
CautionsandSuggestions................................

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Specifications....................... ......... ..... 13

TUNER ....... ..............14
Dmcription-...............................................14

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B.

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FrontEnd.............................................14
IFAmplifier...........................................14
InterstationHush.................. ...... ...............14
DiscriminatorandSCAFilter............................15
MultiplexSection ...... ..15
PowerSupply..........................................17

TunerAlignment.... ..... 17

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2.
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16.

SweepAlignment.......................... ....... ......17
DiscriminatorZeroSetting...... .......... ..............17
MonoDistortion........................................18
MonoOverloadDistortion ......... 18
Sensitivity......................... ...... ..... ...18
MultiplexAdjustments.......................... ..... ...18
PhaseAdjustment...................... ...... ..........19
117FilterAdjustment...................................19
Zero-CenterReadjustment ......... 19
FinalMultiplexAdjustments.............................20
De-EmphasisCheck....................... .......... ...20
Piloth-opoutzo
DialCalibration........... ..... 21
FinalSensitivity Peaking......... ...... 21
Interstation Hush andStereo Squelch Adjustments ..........21
Final Performance Check ............. .................. 22