Read Sony ICF-CD863 / ICF-CD863L Service Manual online
ICF-CD863/CD863L
13
13
– MAIN BOARD (Conductor Side) –
TP
(FM IN)
TP (FM ST)
TP
(RADIO B+)
1
4
CN303
TP
(GND)
TP
(VT)
– MAIN BOARD (Component Side) –
CT4 LW VCO Voltage Adjustment (CD863L)
L4 AM (MW) VCO Voltage Adjustment
RV1 FM Stereo Adjustment
T1 AM IF
Adjustment
L1
FM RF
CT2
}
Tracking
Adjustment
Adjustment
L3-2 LW Tracking Adjustment
CT3
CT3
}
(CD863L)
L3-1 AM (MW) Tracking
CT2
CT2
}
Adjustment
Adjustment Location:
AUTO BRIGHTNESS ADJUSTMENT
Connecting:
1. Set to power off state.
2. Connect a digital voltmeter to TP (DIMMER) and TP (GND)
2. Connect a digital voltmeter to TP (DIMMER) and TP (GND)
on the LCD board and confirm that the voltage is 0 V.
3. Turn on the power.
4. Connect the digital voltmeter to TP (DIMMER) and TP (GND)
4. Connect the digital voltmeter to TP (DIMMER) and TP (GND)
on the LCD board and adjust RV401 so that the voltage be-
comes 1.5
comes 1.5
± 0.05 V.
5. Turn off the power.
6. Applied sufficient light to IC403 (brightness sensor) on the
6. Applied sufficient light to IC403 (brightness sensor) on the
DIMMER board and confirm that the voltage is 3.3
± 0.3 V.
7. Short the BP404.
Adjustment Location:
digital voltmeter
TP (DIMMER)
TP (GND)
100 k
Ω
LCD board
+
–
– LCD BOARD (Component Side) –
RV401 Auto Brightness Adjustment
– LCD BOARD (Conductor Side) –
TP (GND)
TP (DIMMER)
– DIMMER BOARD (Conductor Side) –
IC403
CD SECTION
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
In case of operation check, confirm that focus bias.
FOCUS BIAS CHECK
1. Connect the oscilloscope to TP (RF) and TP (GND) on the CD
board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the
3. Press the
u
(CD) button.
4. 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.
• RF signal reference waveform (eye pattern)
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
TIME/DIV: 500 ns
0.8
±
0.2 Vp-p
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
for AC range and raise vertical sensitivity.
Adjustment Location:
IC701
TP (GND)
TP
(RF)
– CD BOARD (Conductor Side) –
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