21
HCD-GP7
E-F Balance Check
Connection:
Procedure:
1. Connect an oscilloscpe to test point TP2 (TE) and TP7 (DVC)
on the CD board.
2. Turn the power on.
3. Select the function “CD”.
4. Press three buttons of x , [REPEAT] and CD u
simultaneously to set the CD service mode.
5. Put the disc (YEDS-18) in to playback the number five track.
6. Press the [REPEAT] 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
8. Press the [REPEAT] 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, disconnect the power cord.
Traverse Waveform
Checking Location: CD board (SIDE B) (See page 24.)
+
–
CD board
TP2 (TE)
TP7 (DVC)
oscilloscop
0V
B
level: 1.0
±
0.5 Vp-p
Center of
the waveform
A (DC
voltage
0V
Tracking servo
Sled servo
ON
C (DC
voltage
Tracking servo
Sled servo
OFF
Checking Location:
– CD BOARD (SIDE B) –
TP4 (FE)
TP2 (TE)
TP5 (RFAC)
TP7 (DVC)
IC104
IC101
IC103
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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