Sony HCD-GS200 Service Manual page 22

HCD-GS200
QQ
3 7 63 1515 0
E-F Balance Check
Connection:
CD board
TP (TE1)
TP (DVC)
Procedure:
1. Connect an oscilloscpe to test point TP (TE1) and TP (DVC)
on the CD board.
2. Turn the power on.
3. Select the function "CD".
[ENTER]
4. Press three buttons of
[TIMER SELECT]
simultaneously to set the CD service mode.
5. Put the disc (YEDS-18) in to playback the number five track.
.
6. Press the button. The message "TRAVERSE" is
displayed. (The tracking servo and the sledding servo are turned
OFF)
7. 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
TE
L 13942296513
.
8. Press the button. The message "TRAVERSE" is
displayed. (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.
9. To exit from this mode, perform as follows.
1) Move the optical pick-up to the most inside track.
2) Press three buttons of
simultaneously. (cold reset)
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
www OFF
Checking Location: CD board (Conductor side)
.
22
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oscilloscope
+
–
, , and
M
Center of
the waveform
B
A (DC
voltage)
level: 1.15 ± 0.5 Vp-p
[CLEAR] [DISPLAY]
, , and
x
C (DC
voltage)
Tracking servo
Sled servo
ON
x ao
y
i
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8
Checking Location:
– CD BOARD (Conductor Side) –
IC101
TP (FE1)
TP (TE1)
TP (RFAC)
TP (DVC)
IC103
Q Q
3 6 7 1 3
u163
.
2 9 9 4 2 8
IC104
1 5 0 5 8 2 9 9 4
m
co
9 9
2 8 9 9