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CD SECTION
Note:
1.
CD Block is basically constructed to operate without
adjustment. Therefore, check each item in order given.
2.
Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3.
Use an oscilloscope with more than 10MΩ 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.
Adjust the focus bias adjustment when optical block is replaced.
RF Level Check
CD DECODER
board
TP (RF)
TP (VC)
Procedure :
1.
Connect oscilloscope to test point TP (RF) on CD DECODER
board.
2.
Turned Power switch on.
3.
Put disc (YEDS-18) in and playback.
4.
Confirm that oscilloscope waveform is clear and check RF
signal level is correct or not.
Note: Clear RF signal waveform means that the shape "◊" can be
clearly distinguished at the center of the waveform.
TE
L 13942296513
Adjustment Location:
[CD DECODER BOARD] Component side
IC702
J778
TP (VC)
IC701
J789
TP
CN701
www
(RF)
.
18
http://www.xiaoyu163.com
oscilloscope
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
+0.3
level: 1.0
Vp-p
–0.2
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http://www.xiaoyu163.com
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