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QQ
3 7 63 1515 0
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
4-1. PRECAUTIONS FOR CHECK
1. Perform check in the order given.
2. Use YEDS-18 disc (Part No.: 3-702-101-01) unless otherwise
indicated.
3. Power supply voltage requirement: DC 4.5 V in DC IN jack.
(J401)
VOLUME button : Minimum
AVLS switch
HOLD switch
4-2. FOCUS BIAS CHECK
Condition:
• Hold the set in horizontal state.
Connection:
MAIN board
TP629 (RF)
Procedure:
1. Connect the oscilloscope between TP629 (RF)
and GND on MAIN board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
TE
L 13942296513
3. Press the u 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 ( ) in the
center of the waveform can be clearly distinguished.
5. Stop revolving of the disc motor by pressing the x button.
• RF signal reference waveform (eye pattern)
VOLT/DIV : 50 mV (10 : 1 probe in use)
TIME/DIV : 500 nS
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
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.
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ELECTRICAL ADJUSTMENT
: NORM
: OFF
oscilloscope
(AC range)
2 kΩ
RF level :
0.45 to 0.65 Vp-p
x
ao
y
i
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SECTION 4
8
Test Points:
– main board (side B) –
90
85
95
100
105
110
115
1
5
Q Q
3
6 7
1 3
u163
.
– 9 –
2 9
9 4
2 8
80
75
70
65
60
55
50
45
40
35
10
15
20
25
30
TP629 (RF)
1 5
0 5
8
2 9
9 4
m
co
9 9
1
6
2
5
3
4
4
5
6
3
2
1
2 8
9 9
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