Read Sony ICF-C795RC Service Manual online
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SECTION 3
ELECTRICAL ADJUSTMENTS
0 dB = 1 µV
[AM]
Setting:
Band switch: AM
Band switch: AM
[FM]
Setting:
Band switch: FM
Band switch: FM
• Repeat the procedures in each adjustment several times, and
the tracking adjustments should be finally done by the trimmer
capacitors.
capacitors.
• Remove FM antenna in FM adjustments.
Adjustment Location: MAIN board (See page 8)
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
set
8
Ω
MAIN board TP (SP GND)
MAIN board
TP (SP +)
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
MAIN board TP (SP GND)
MAIN board
TP (SP +)
set
MAIN board
TP (FM-IN)
8
Ω
0.01
µ
F
MAIN board
TP (FM GND)
digital voltmeter
100 k
Ω
TP (VT)
TP (FM GND)
+
–
–
MAIN board
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
450 kHz
AM VCO VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L5
531 kHz
2.65 V ± 0.1 V
Confirmation
1,602 kHz
Less than 9.5 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
621 kHz
TC1
1,404 kHz
FM VCO VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L4
87.5 MHz
3 V ± 0.1 V
Confirmation
108 MHz
Less than 11.8 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
87.5 MHz
TC3
108 MHz
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