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CD SECTION
Note:
1.
CD Block is basically constructed to operate without
adjustment.
2.
Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10 MΩ impedance.
4.
Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the
following checks.
5.
Check the focus bias check when optical block is replaced.
Focus Bias Check
BD board
TP5 (RF AC)
TP7 (DVC)
Procedure :
1.
Connect an oscilloscope to TP5 (RF AC) and TP7 (DVC) on
the CD board.
2.
Press the
button to turn the power on, and press the
?/1
button to open the CD disc tray.
3.
Put the test disc (YEDS-18) in and press the
play-back.
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
TE
L 13942296513
center of the waveform can be clearly distinguished.
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.
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ELECTRICAL ADJUSTMENTS
oscilloscope
(DC range)
+
–
gG
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level:
1.2 ± 0.1 Vp-p
x
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SECTION 3
2 9
8
Checking Location:
– CD BOARD (Side B) –
IC150
TP7(DVC)
IC103
Z
button to
Q Q
3
6 7
1 3
1 5
co
.
HCD-WZ5
9 4
2 8
IC101
TP5(RF AC)
0 5
8
2 9
9 4
2 8
m
9 9
9 9
13
- Quick Links:
- Tuner (Fm/Am), Woofer Board
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