Sony ICF-CD73 / ICF-CD73V Service Manual ▷ View 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
14
ICF-CD73/CD73V
Adjustment and Connecting Location:
TP
(VT)
TP
(GND)
TP
(ANT)
– TUNER BOARD (Component Side) (ICF-CD73) –
– TUNER BOARD (Conductor Side) (ICF-CD73) –
L4
AM VCO Voltage Adjustment
L2
FM VCO Voltage Adjustment
AM Tracking Adjustment
CT3
L3
L3
FM Tracking Adjustment
T1 AM IF Adjustment
T2 FM IF Adjustment
L1
CT1
CT1
15
ICF-CD73/CD73V
Adjustment and Connecting Location:
T2
IF Adjustment
T1
IF Adjustment
L6
AM VCO Voltage Adjustment
L2
CT1
CT2
L1
FM/TV (2 – 6 CH)
Tracking Adjustment
Tracking Adjustment
AM Tracking Adjustment
L3
CT4
L4
CT3
L5
CT5
TV (7 – 13 CH)/
WEATHER (1 – 7 CH)
Tracking Adjustment
WEATHER (1 – 7 CH)
Tracking Adjustment
TV (7 – 13 CH)/
WEATHER (1 – 7 CH)
VCO Voltage Adjustment
WEATHER (1 – 7 CH)
VCO Voltage Adjustment
TV TV (2 – 6 CH)
VCO Voltage Adjustment
VCO Voltage Adjustment
– TUNER BOARD (Component Side) (ICF-CD73V) –
– TUNER BOARD (Conductor Side) (ICF-CD73V) –
TP
(GND
)
TP
(
VT
)
TP
(
ANT
)
16
ICF-CD73/CD73V
CD SECTION
Perform all CD section check in the test mode.
FOCUS BIAS CHECK
Procedure:
1. Connect the oscilloscope to TP (RF) and TP (VC) on the CD
1. Connect the oscilloscope to TP (RF) and TP (VC) on the CD
board.
2. Set the CD test mode. (Refer to CD TEST MODE (See page
11))
3. Insert the test disc (YEDS-18). (Part No. 3-702-101-01) (CD)
4. Press the
4. Press the
[CD ]
button. (LPC ON)
5. Confirm that the oscilloscope waveform is as shown in the
figure below. (eye pattern)
A good eye pattern means that the diamond shape (
A good eye pattern means that the diamond shape (
◊) in the
center of the waveform can be clearly distinguished.
6. Press the
[CD ]
button. (LPC OFF)
7. Perform confirmation in the same manner as step 5.
8. Press the
8. Press the
[OFF ]
button.
9. Change the test disc (TCD-W082L). (Part No. J-2502-063-2)
(CD-RW)
10. Perform confirmation in the same manner as step 4 to 7.
• RF signal reference waveform (eye pattern)
Connecting Location:
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
TIME/DIV: 500 ns
CD:
1.1
1.1
±
0.2 Vp-p (LPC ON)
1.1
±
0.3 Vp-p (LPC OFF)
CD-RW:
1.0
1.0
±
0.2 Vp-p (LPC ON)
0.9
±
0.3 Vp-p (LPC OFF)
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
for AC range and raise vertical sensitivity.
TP
(VC)
TP
(RF)
IC702
IC701
– CD BOARD (Conductor Side) –
TP
(TE)
x
NX
NX
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