Read Sony ICF-C620 Service Manual online
– 9 –
5-2. RADIO SECTION
AM
FM
Put the lead-wire
antanna close to
the set.
antanna close to
the set.
30% amplitude
modulation by
400 Hz signal
modulation by
400 Hz signal
AM rf signal
generator
generator
set
speaker terminal
FM rf signal
generator
generator
22.5 kHz frequency deviation
by 400 Hz signal
output level : as low as possible
by 400 Hz signal
output level : as low as possible
to FM antenna
terminal
terminal
0.01 µF
set
speaker terminal
level meter
(range : 0.5 – 5 V ac)
• Repeat the procedures is each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
done by the trimmer capacitors.
Adjustment Location : main board (component side)
CT2 L2
CT4 L4
CT1 L1
CT3
FM
TRACKING
ADJ
AM
TRACKING
ADJ
T1
AM IF
ADJ
VR2
TAPE SPEED
ADJ
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
455 kHz
AM FREQUENCY COVERAGE
ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
CT2
520 kHz (516.5 kHz)
1,650 kHz (1,631.5 kHz)
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
600 kHz
1,400 kHz
FM FREQUENCY COVERAGE
ADJUSTMENT
Adjust for a maximum reading on level meter.
L4
CT4
86.5 MHz (87.35 MHz)
109.5 MHz (108.25 MHz)
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
(confirmation)
CT3
86.5 MHz (87.35 MHz)
109.5 MHz (108.25 MHz)
( ) : Italian model
level meter
(range : 0.5 – 5 V ac)
AM
FREQUENCY
COVERAGE ADJ
FM
FREQUENCY
COVERAGE ADJ
Click on the first or last page to see other ICF-C620 service manuals if exist.