Read Sony ICF-CD73 / ICF-CD73V Service Manual online
13
ICF-CD73/CD73V
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
450 kHz
( ): ICF-CD73V
AM VCO VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L4 (L6)
530 kHz (531 kHz)
1.0
± 0.05 V (1.0 ± 0.1 V)
Confirmation
1,710 kHz
5.3
± 0.7 V
( ): ICF-CD73V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3 (L5)
620 kHz (580 kHz)
CT3 (CT5)
1,400 kHz (1,490 kHz)
FM IF ADJUSTMENT
Adjust for a minimum reading on level meter
T2
10.7 MHz
FM VCO VOLTAGE ADJUSTMENT (ICF-CD73)
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L2
108 MHz
3.0
± 0.2 V
Confirmation
87.5 MHz
1.3
± 0.3 V
FM TRACKING ADJUSTMENT (ICF-CD73)
Adjust for a maximum reading on level meter
L1
87.5 MHz
CT1
108 MHz
FM/TV (2 – 6 CH) VCO VOLTAGE ADJUSTMENT (ICF-CD73V)
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L4
TV 2 ch
1.0
± 0.15 V
CT3
108 MHz
4.0
± 0.15 V
FM/TV (2 – 6 CH) TRACKING ADJUSTMENT (ICF-CD73V)
Adjust for a maximum reading on level meter
L2
TV 2 ch
Confirmation
108 MHz
TV (7 – 13 CH)/WEATHER (1 – 7 CH) VCO VOLTAGE ADJUSTMENT (ICF-CD73V)
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L3
WEATHER 2 ch
1.0
± 0.15 V
CT4
TV 13 ch
4.1
± 0.15 V
TV (7 – 13 CH)/WEATHER (1 – 7 CH) TRACKING ADJUSTMENT (ICF-CD73V)
Adjust for a maximum reading on level meter
L1
WEATHER 2 ch
CT2
TV 13 ch
Adjustment and Connecting Location: TUNER board (ICF-
CD73)
(See page 14)
TUNER board (ICF-
CD73V)
(See page 15)
(See page 14)
TUNER board (ICF-
CD73V)
(See page 15)
TUNER SECTION
0 dB=1
µ
V
[AM]
Setting:
Function: RADIO
Band: AM
Function: RADIO
Band: AM
[FM/TV/WEATHER]
Setting:
Function: RADIO
Band: FM (ICF-CD73)
Function: RADIO
Band: FM (ICF-CD73)
FM/TV/WEATHER (ICF-CD73V)
• Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer ca-
pacitors.
pacitors.
• Remove FM/TV/WEATHER antenna in FM/TV/WEATHER
adjustment.
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
3.2
Ω
JACK board
CNP304 pin
CNP304 pin
2
JACK board
CNP304 pin
CNP304 pin
1
FM RF signal
generator
75 kHz frequency
deviation by 1 kHz
signal
Output level:
as low as possible
deviation by 1 kHz
signal
Output level:
as low as possible
+
–
–
level meter
JACK board
CNP304 pin
CNP304 pin
2
JACK board
CNP304 pin
CNP304 pin
1
set
3.2
Ω
0.01
µ
F
TUNER board
TP (GND)
TP (GND)
TUNER board
TP (ANT)
TP (ANT)
digital voltmeter
TP (VT)
TP (GND)
100 k
Ω
TUNER board
SECTION 5
ELECTRICAL ADJUSTMENTS
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