Fm If Adjustment; Sync Usb/Lsb Zero-Beat Adjustment; Am Tracking Adjustment - Sony ICF-SW77 Service Manual

ICF-SW77
FM IF Adjustment
Setup:
Band Selector: FM
Frequency: clear spot
VOLUME control: Arbitrary
FMRFSSG VTVM
Procedure:
1. Adjust T253 to obtain a maximum signal output with VTVM.
AM Tracking Adjustment
Setup:
Band Selector: AM
AM RFSSG
Put the lead-wire
antenna close to
the set.
30% amplitude
modulation by
400 Hz signal
VTVM
(range: 0.5 - 5 V ac)
headphones jack
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on VTVM.
ANT2-2
540 kHz
CT201
1,600 kHz
LW TRACKING ADJUSTMENT
| Adjust for a maximum reading on VTVM. |
ANT2-4
155 kHz
CT202 280 kHz
SYNC USB/LSB ZERO-BEAT Adjustment
Setup:
Band Selector: AM
MODE Selector: SSB (USB or LSB/CW)
Procedure:
1. Tune in the set to a known, stable and strong AM station.
2. Adjust L301 for a zero-beat note.
3. Chage the MODE selector to the opposite side band (ex. first USB,
next LSB/CW), and confirm it continues to hold a zero-beat note.
When it doesn't, adjust again.
| SW TRACKING ADJUSTMENT
Adjust for a maximum reading on VTVM.
j
CT2
17,900 kHz
T4
10,000 kHz
CT1
26,100 kHz
T5
18,000 kHz
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