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13
HCD-WZ5
SECTION 3
ELECTRICAL ADJUSTMENTS
CD SECTION
Note:
1.
CD Block is basically constructed to operate without
adjustment.
adjustment.
2.
Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10 M
Ω 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.
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
Procedure :
1.
1.
Connect an oscilloscope to TP5 (RF AC) and TP7 (DVC) on
the CD board.
the CD board.
2.
Press the
?/1
button to turn the power on, and press the
Z
button to open the CD disc tray.
3.
Put the test disc (YEDS-18) in and press the
gG
button to
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 (
below. (eye pattern)
A good eye pattern means that the diamond shape (
) in the
center of the waveform can be clearly distinguished.
+
–
–
BD board
TP5 (RF AC)
TP7 (DVC)
TP7 (DVC)
oscilloscope
(DC range)
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
TIME/DIV: 500 ns
level:
1.2
1.2
±
0.1 Vp-p
s
Checking Location:
– CD BOARD (Side B) –
IC103
IC150
TP5(RF AC)
TP7(DVC)
IC101
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