Aiwa CX-JDS20 Service Manual page 20

CX-JDS20/JDS50
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. 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%
Traverse Waveform
0V
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.
Traverse Waveform
0V
Tracking servo
Sled servo
OFF
Checking Location: BD board (Side B)
20
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 (Side B) –
IC251
TP
(VC)
TP
(TEO)
TP
(FEO)
TP
(RFDCO)
IC303
IC301
IC101
TP
(RFACO)