Read Sony ICF-28 Service Manual online
– 4 –
0 dB = 1µV
[FM]
Setting:
Band switch: FM
Setting:
Band switch: FM
[AM]
Setting:
Band switch: AM
Setting:
Band switch: AM
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
• Remove FM antenna in FM adjustments.
Adjustment Location:
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
86.5 MHz (64.0MHz)
CT3
109.5 MHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
86.5 MHz (64.0MHz)
CT2
109.5 MHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
520 kHz
CT4
1,750 kHz
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
600 kHz
CT1
1,400 kHz
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455 kHz
SECTION 3
ELECTRICAL ADJUSTMENTS
( ): East European model
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
deviation by 400 Hz
signal
Output level: as low as possible
+
–
–
level meter
speaker terminal
set
FM antenna terminal
4
Ω
0.01
µ
F
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level: as low as possible
modulation by
400 Hz signal
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
+
–
–
level meter
speaker terminal
set
4
Ω
CT3
L3
FM Frequency
Coverage
Adjustment
CT4
L4
AM Frequency
Coverage
Adjustment
FM Tracking
Adjustment
L2 CT2
FM
Antenna in
Antenna in
AM Tracking
Adjustment
L1 CT1
IC1
Speaker in
T2
T1
AM IF
Adjustment
[MAIN board]
(Component Side)
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