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20
CX-JDS20/JDS50
E-F Balance Adjustment
Connection:
Procedure:
1. Connect an oscilloscpe to test point TP (TEO) and TP (VC)
on the BD board.
2. Set the FUNCTION to “CD”.
3. AC is put in pushing
nN
button to enter the CD test mode.
4. Put the disc (YEDS-18) in to playback the number five track.
5. Press the
nN
button. If it plays, press the
nN
button
again. (The tracking servo and the sledding servo are turned
OFF)
6. Check the level B of the oscilliscope’s waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than
±
10%
7. Press the
nN
button. (The tracking servo and sledding
servo are turned ON)
8. To exit from this mode, turn the power off.
Notes:
• Always move the optical pick-up to most inside track when exiting
from this mode. Otherwise, a disc will not be unloaded.
• Do not run the sled motor excessively, otherwise the gear can be
chipped.
Checking Location: BD board (Side B)
Checking Location:
– BD BOARD (Side B) –
+
–
BD board
oscilloscope
TP (TEO)
TP (VC)
Traverse Waveform
0V
Center of
the waveform
B
A (DC
voltage)
level: 1.0
±
0.5 Vp-p
Traverse Waveform
Tracking servo
Sled servo
ON
C (DC
voltage)
IC251
IC301
IC101
IC303
TP
(RFACO)
TP
(VC)
TP
(FEO)
TP
(RFDCO)
TP
(TEO)
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