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 .................................. ....... .......
1.
2.
3.
4.
5.
6.
BiasingProcedure............................ ............
1.
2.
ModificationsandUpdates............................... .....
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
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................................
mqqquqdamm
Specifications....................... ......... ..... 13
TUNER ....... ..............14
Dmcription...............................................14
A.
B.
1.
2.
3.
4.
5.
8.
FrontEnd.............................................14
IFAmplifier...........................................14
InterstationHush.................. ...... ...............14
DiscriminatorandSCAFilter............................15
MultiplexSection ...... ..15
PowerSupply..........................................17
TunerAlignment.... ..... 17
l.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
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