Read Sony ICF-CD73W Service Manual online
ICF-CD73W
14
SECTION 5
ELECTRICAL ADJUSTMENT
[AM]
Setting:
Function: RADIO
Band: AM
Setting:
Function: RADIO
Band: AM
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level:
as low as possible
Put the lead-wire
antenna close to
the set.
+
–
level meter
set
3.2
Ω
JACK board
CNP304 pin
JACK board
CNP304 pin
[FM/TV/WEATHER]
Setting:
Function: RADIO
Band: FM/WEATHER
Setting:
Function: RADIO
Band: FM/WEATHER
FM RF signal
generator
75 kHz frequency
deviation by 1 kHz
signal
Output level:
as low as possible
+
–
level meter
JACK board
CNP304 pin
JACK board
CNP304 pin
set
3.2
Ω
0.01 F
TUNER board
TP (GND)
TUNER board
TP (ANT)
digital voltmeter
TP (VT)
TP (GND)
100 k
Ω
TUNER board
• Repeat the procedures in each adjustment several times, and
the tracking adjustments should be fi nally done by the trimmer
capacitors.
capacitors.
• Remove FM/WEATHER antenna in FM/WEATHER adjust-
ment.
TUNER SECTION
0 dB = 0.775V
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
L6
530 kHz
1.0 ± 0.1 V
Confi rmation
1,710 kHz
5.2 ± 0.8 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L5
580 kHz
CT5
1,490 kHz
FM IF ADJUSTMENT
Adjust for a minimum reading on level meter
T2
10.7 MHz
FM VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L4
87.5 MHz
2.7 ± 0.3 V
CT3
108 MHz
4.5 ± 0.3 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2
87.5 MHz
Confi rmation
108 MHz
WEATHER (1 – 7 CH) VCO VOLTAGE ADJUSTMENT
Adjustment Part Frequency Display Reading on Digital Voltmeter
L3
WEATHER 2 ch
1.2 ± 0.3 V
CT4
WEATHER 1 ch
1.21 ± 0.3 V
WEATHER (1 – 7 CH) TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
WEATHER 2 ch
CT2
WEATHER 1 ch
Adjustment and Connecting Location: TUNER board
(See page 15)
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