4
ICF-C1200
SECTION 3
ELECTRICAL ADJUSTMENTS
BAND button : AM
Volume : MIN
3-1.TUNER SECTION
AM Section
FM Section
BAND button : FM
Volume : MIN
Put the lead-wire
antenna close to
the set.
AM RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
telescopic
antenna
terminal
FM RF signal
generator
22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible
0.01 uF
Adjustment Location : Main board (See page 5)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T101
1485kHz
<
1480kHz
>
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust part
Frequency display
L105
531kHz <530kHz>
reading on digital
voltmeter.
Adjustment value: 2.7V
Standaed value: 2.5 to 2.9V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L 102
585kHz <580kHz>
CT101
1,485kHz <1,480kHz>
Frequency Coverage Adjustment
Connect Location :
FM FREQUENCY COVERAGE CONFIRMATION
Adjust part Frequency display
Confirmation
87.5MHz
3.0 to 4.0V
Confirmation
108MHz
9.5 to 10.5V
reading on digital
voltmeter
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L103
87.5MHz
CT102
108MHz
32
Ω
level meter
set
J201 (phones)
+
–
0dB=1
µ
V
< > : US model
MAIN BOARD (SIDE A)
S308
(JOG SWITCH)
BAT401
PAS
TP
(VT)
C405
R404
C412
R403
R314
R315
R405
C404
C301
C406
C407
R401
R402
D402
D403
BCE
Q402
B
Q
302
E
CB
T401
+
–
Digital
TP
(VT)
100K
Ω
voltmeter
