Sony CX-LDB30 Service Manual page 23

E-F Balance Adjustment
Connection:
BD board
TP (TEO)
TP (VC)
Procedure:
1. Connect an oscilloscpe to test point TP (TEO) and TP (VC)
on the BD board.
2. AC is put in pushing CD u button to enter the CD test
mode.
3. Put the disc (YEDS-18) in to playback the number five track.
4. Press the CD u button. If it plays, press the CD u button
again. (The tracking servo and the sledding servo are turned
OFF)
5. 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%
Traverse Waveform
0V
6. Press the CD u button. (The tracking servo and sledding
servo are turned ON)
Rotate RV101 on BD board and adjust the C (DC voltage) is
almost equal to the A (DC voltage) in step 4.
7. 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.
Traverse Waveform
0V
Tracking servo
Sled servo
OFF
Checking Location: BD board (Conductor Side)
oscilloscope
+
–
Center of
the waveform
B
A (DC
voltage)
level: 1.0 ± 0.5 Vp-p
C (DC
voltage)
Tracking servo
Sled servo
ON
Checking Location:
– BD BOARD (Conductor Side) –
IC251
TP
(VC)
TP
(VEO)
TP
(FEO)
TP
(RFDCO)
CX-LDB30/LDB50
IC303
IC301
IC101
TP
(RFACO)
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