Read Sony CDP-XE270 / CDP-XE370 Service Manual online
12
CDP-XE270/XE370
Ver 1.1 2001.07
E-F Balance Check
Connection:
Procedure:
1.
1.
Connect an oscilloscpe to test point TP (TE1) and TP (VC) on
the BD board.
the BD board.
2.
Turn the power on.
3.
Put the disc (PATD-012) in to playback the number two track.
4.
Press the
[TIME]
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%
(DC voltage) of the center of the Traverse waveform.
Confirm the following :
A/B x 100 = less than ± 22%
Traverse Waveform
6.
Press the
[TIME]
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.
Confirm the C (DC voltage) is almost equal to the A (DC
voltage) is step 5.
Traverse Waveform
Checking Location: BD board
+
–
–
BD board
TP (TE1)
TP (VC)
oscilloscope
0V
B
level: 1.15
±
0.5 Vp-p
Center of
the waveform
the waveform
A (DC
voltage)
0V
Tracking servo
Sled servo
ON
C (DC
voltage)
voltage)
Tracking servo
Sled servo
OFF
Checking Location:
– BD BOARD (Conductor Side) –
TP
(RFDC)
TP
(FE1)
TP
(VC)
IC131
IC150
IC101
TP
(TE1)
TP
(RFAC)
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