Sony AN-101 Service Manual page 17

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1st/2nd IF ADJUSTMENT
Setup:
VOLUME control: as required
AM RF SSG
Put the lead-wire
antenna close to
the set.
Cs]
400 Hz, 30%
AM modulation
VTVM
(AC range)
EARPHONE
Procedure:
@ ist IF ADJUSTMENT
1. Set the frequencies of the AM RF SSG and the frequency dis-
play of the set to 156 kHz.
2. Adjust T3 and T4 to obtain a maximum reading on the VTVM.
@ 2nd IF ADJUSTMENT
1. Set the frequencies of the AM RF SSG and the frequency dis-
play of the set to 156 kHz.
2. Adjust TS to obtain a maximum reading on the VTVM.
@ FM SECTION
FM FREQUENCY COVERAGE (VCO VOLTAGE)
ADJUSTMENT
Setup:
VOLUME control: as required
c ~«[MAIN BOARD)
(SIDE B)
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Procedure:
1. Tune the set to 108 MHz.
2. Adjust T403 to obtain a 11.9 — 12.1 Von the VTVM.
NOTE: This adjustment should be performed after the remove Rod-
Antenna (ANT1).
This adjustment should be performed after the FM FRE.
QUENCY-COVERAGE ADJUSTMENT.
FM TRACKING ADJUSTMENT
Setup:
VOLUME control: as required
VTVM
FM RF SSG (DC range}
frequency deviation:
22.5 kHz by 400 Hz
[MAIN BOARD]
(SIDE B)
Procedure:
. Set the frequencies of the FM RF SSG and the frequency display of
the set to 76 MHz.
. Adjust T401 and T402 to obtain a maximum reading on the VIVM.
. Set the frequencies of the FM RF SSG and the frequency display of
the set to 108 MHz.
. Adjust CT401 and CT402 to obtain a maximum reading on the
VTVM.
. Repeat the above steps several times, and finish the adjustment with
the trimmers CT401 and CT402.
FM STEREO ADJUSTMENT
Setup:
VOLUME control: as reguired
DC5V
frequency
counter
==, (MAIN BOARD]
= (SIDE B)
Procedure:
1. Adjust RV401 to obtain a 75.9 — 76.1 kHz on the frequency
counter.