Disassembly; Cabinet (Rear); Electrical Adjustments - Sony ICF-SW7600GR - Portable Radio Service Manual

ICF-SW7600GR
Note : Follow the disassembly procedure in the numerical order given.
2-1.

CABINET (REAR)

2 Two screws (+BTP 3 × 25)
4 Cabinet (rear)
• AM Section
AM RF signal
generator
30% amplitude
modulation by
400Hz signal
output level: as low as possible
• FM Section
FM RF signal
generator
22.5kHz frequency
deviation by 400Hz signal
output level: as low as possible
set
i headphones jack (J202)
6
SECTION 2

DISASSEMBLY

3 Four claws
SECTION 3

ELECTRICAL ADJUSTMENTS

Put the lead-wire
antenna close to
the set.
FM RF IN
set
level meter
16 Ω
1 Three screws (+BTP 3 × 25)
(1) AM / FM VCO Check and Adjustment
Setting:
ATT switch : OFF
TONE switch : MUSIC
AM MODE switch : NORM
Procedure:
1. Connect digital voltmeter to the TP VT.
2. Tune the set to AM 150kHz.
3. Confirm that the reading on the digital voltmeter becomes in
more than 2.2V.
4. Tune the set to AM 29999kHz.
5. Confirm that the reading on the digital voltmeter becomes in
less than 13V.
6. Tune the set to FM 108.00MHz.
7. Confirm that the reading on the digital voltmeter becomes in
less than 13V.
8. IF the value is more than 13V, adjust T202 so that the reading
on the digital voltmeter becomes in 12.5V.
Adjustment Location: MAIN board (See page 8)
(2) 1st IF Adjustment
Setting :
ATT switch : OFF
TONE switch : MUSIC
AM MODE switch : NORM
Procedure:
1. Set the frequencies of the AM RF signal generator and the
frequency display of the set to AM 150kHz.
2. Adjust T104 and T105 so that the reading on level meter
becomes in maximum.
Adjustment Location: MAIN board (See page 8)