Read Sony ICF-CD73W Service Manual online
ICF-CD73W
ICF-CD73W
15
15
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
Procedure:
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 [CD
4. Press the [CD
u
] button. (LPC ON)
5. Confi rm that the oscilloscope waveform is as shown in the
fi gure below. (eye pattern)
A good eye pattern means that the diamond shape (
◊ in the
center of the waveform can be clearly distinguished.
6. Press the [CD
u
]button. (LPC OFF)
7. Perform
confi rmation in the same manner as step 5.
8. Press the [OFF
x
] button.
9. Change the test disc (TCD-W082L). (Part No. J-2502-063-2)
(CD-RW)
10. Perform confi rmation in the same manner as step 4 to 7.
• RF signal reference waveform (eye pattern)
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
CD:
1.1 ± 0.2 Vp-p (LPC ON)
1.1 ± 0.3 Vp-p (LPC OFF)
CD-RW:
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.
Connecting Location:
TP
(VC)
TP
(RF)
IC702
IC701
– CD BOARD (Conductor Side) –
TP
(TE)
CD SECTION
Adjustment and Connecting Location:
– TUNER BOARD (Component Side) –
T2
IF Adjustment
T1
IF Adjustment
L6
AM VCO Voltage Adjustment
L2
CT1
CT2
L1
FM Tracking Adjustment
AM Tracking Adjustment
L3
CT4
L4
CT3
L5
CT5
WEATHER (1 – 7 CH)
Tracking Adjustment
Tracking Adjustment
WEATHER (1 – 7 CH)
VCO Voltage Adjustment
VCO Voltage Adjustment
FM
VCO Voltage Adjustment
VCO Voltage Adjustment
– TUNER BOARD (Conductor Side) –
TP
(GND)
TP
(VT)
TP
(ANT)
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