Sony CDP-XB720 Service Manual page 11

QQ
3 7 63 1515 0
1 track jump waveform
0V
E-F Balance Check (With general remote commander)
BD board
TP (TE)
TP (VC)
Procedure :
1. Connect the test point JW003 (ADJ) on MAIN board to the
ground with a lead wire on main board.
2. Connect oscilloscpe to test point TP (TE) on BD board.
3. Turn ON the power and to set the ADJ mode.
4. Put disc (YEDS-18) in to play the number five track.
5. Press the 4 button. (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 ± 22%
TE
L 13942296513
Traverse waveform
0V
7. Press the 9 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 6.
Traverse waveform
0V
8. Disconnect the lead wire of JW003 (ADJ) connected in step 1.
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Center of the waveform
B
A (DC voltage)
+ 0.7
level : 1.3 Vp-p
symmetry
– 0.6
oscilloscope
Center of the waveform
B
A (DC voltage)
level : 1.3 ± 0.6 Vp-p
Tracking servo
Tracking servo
Sledding servo
Sledding servo
ON
OFF
x ao
y
i
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8
Adjustment Location :
[ MAIN BOARD ] – Component Side –
[ BD BOARD ] – Side A –
Q Q
3 6 7 1 3
TP
(R151)
TP(RF)
TP(IOP)
CN102
C (DC
voltage)
u163
.
– 11 –
2 9 9 4 2 8
JW004
(AFADJ)
JW003
(ADJ)
CN302
1 5 0 5 8 2 9 9 4
TP(FE)
TP(TE)
TP(FEI)
TP(VC)
IC101
m
co
9 9
2 8 9 9