Sony CF-CD73 - 5 Electrical Adjustments

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)
TUNER SECTION 0 dB=1 µV
[AM]
Setting:
Function: RADIO
Band: AM
[FM/TV/WEATHER]
Setting:
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.
• 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
Put the lead-wire
antenna close to
the set.
+
–
level meter
set
3.2 Ω
JACK board
CNP304 pin 2
JACK board
CNP304 pin 1
FM RF signal
generator
75 kHz frequency
deviation by 1 kHz
signal
Output level:
as low as possible
+
–
level meter
JACK board
CNP304 pin 2
JACK board
CNP304 pin 1
set
3.2 Ω
0.01 µF
TUNER board
TP (GND)
TUNER board
TP (ANT)
digital voltmete
r
TP (VT)
TP (GND)
100 kΩ
TUNER board
SECTION 5
ELECTRICAL ADJUSTMENTS