Sony CDP-XE270 Service Manual page 12

CDP-XE270/XE370
Ver 1.1 2001.07
E-F Balance Check
Connection:
BD board
TP (TE1)
TP (VC)
Procedure:
1. Connect an oscilloscpe to test point TP (TE1) and TP (VC) on
the BD board.
2. Turn the power on.
3. Put the disc (PATD-012) in to playback the number two track.
[TIME]
4. Press the button. (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 ± 22%
Traverse Waveform
0V
[TIME]
6. Press the button. (The tracking servo and sledding servo
are turned ON)
Confirm the C (DC voltage) is almost equal to the A (DC
voltage) is step 5.
Traverse Waveform
0V
Tracking servo
Sled servo
OFF
Checking Location: BD board
12
oscilloscope
+
–
Center of
the waveform
B
A (DC
voltage)
level: 1.15 0.5 Vp-p
C (DC
voltage)
Tracking servo
Sled servo
ON
Checking Location:
– BD BOARD (Conductor Side) –
IC150
TP
(VC)
IC131
TP
IC101
(FE1)
TP
(TE1)
TP
(RFDC)
TP
(RFAC)