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D-F20
QQ
3 7 63 1515 0
Adjustment Location:
TE
L 13942296513
CD SECTION
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
FOCUS BIAS CHECK
1. Connect the oscilloscope between TP629 (RF) and GND on
main board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the N X 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 (
center of the waveform can be clearly distinguished.
• RF signal reference waveform (eye pattern)
VOLT/DIV : 20 mV (10 : 1 probe in use)
TIME/DIV : 500 nS
www
.
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
8
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– MAIN BOARD (SIDE A) –
CN501
AM IF ADJ
T1
TP3
RF-IN
L3
L1
CT3 L4
AM TRACKING
ADJ
) in the
RF level :
x
ao
u163
0.45 ± 0.1 Vp-p
y
i
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2 9
8
CT1
FM TRACKING ADJ
L2
TP81
VT
IC61
Q Q
3
6 7
1 3
1 5
Test Point:
– MAIN BOARD (SIDE B) –
co
.
9 4
2 8
0 5
8
2 9
9 4
2 8
m
TP629
RF
9 9
9 9
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