Adjustments - Sony An-101 Service Manual

@ Parts location diagram relevant
to the adjustment
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SECTION 5
ELECTRICAL ADJUSTMENTS
T3 T401 T4 TS T202 RV401
Ist IF FM Tracking Ist IF 2nd IF 2nd Local FM Stereo
Adjustment Adjustment Adjustment Adjustment Adjustment Adjustment
[MAIN BOARD]
(SIDE A)
iq O a
(ee) RV202
5K Step
oO Adjustment
@ RV201
3 kHz Step
i
@
Adjustment
7201 CT402 T7403 T402 CT401
Ist Local FM Tracking FM VCO FM Tracking FM Tracking
Adjustment Adjustment Adjustment Adjustment Adjustment
® AM SECTION
1st LOCAL ADJUSTMENT
| Setup:
VOLUME control: as required
' Procedure:
1. Tune the set to AM 150 kHz.
2. Adjust T201 to obtain a 2.59 — 2.61 V on the VTVM.
. 3. Tune the set to AM 29.995 MHz.
4. Confirm that the voltage reading on the VTVM is less than 12 V.
2nd LOCAL ADJUSTMENT/3 kHz STEP/5 kHz
STEP ADJUSTMENT
Setup:
VOLUME control: as required
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DC5V
|
frequency
counter
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= [MAIN
ae BOARD]
ee
(SIDE A)
E101 1700 Lae
Procedure:
@ 2nd LOCAL ADJUSTMENT
1. Tune the set to AM 153 kHz.
2. Adjust T202 to obtain a 55.3899 — 55.3901 MHz on the fre-
quency counter.
@ 3kHz STEP ADJUSTMENT
3. Tune the set to AM 156 kHz.
4. Adjust RV201 to obtain a 55.3869 — 55.3871 MHz on the fre-
quency counter.
@® 5kHz STEP ADJUSTMENT
5. Tune the set to AM 1,620 kHz.
6. Adjust RV202 to obtain a 55.3850 MHz on the frequency
counter.