Sony CDP-XB720, Руководство по обслуживанию

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E-F Balance Check (With general remote commander)
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%
Traverse waveform
oscilloscope
BD board
TP (TE)
TP (VC)
[ BD BOARD ] – Side A –
Adjustment Location :
[ MAIN BOARD ] – Component Side –
0V
level : 1.3
±
0.6 Vp-p
A (DC voltage)
Center of the waveform
B
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
C (DC
voltage)
Tracking servo
Sledding servo
OFF
Tracking servo
Sledding servo
ON
8. Disconnect the lead wire of JW003 (ADJ) connected in step 1.
CN102
IC101
TP(FEI)
TP(VC)
TP(IOP)
TP(RF)
TP(TE)
TP(FE)
TP
(R151)
0V
level : 1.3 Vp-p
A (DC voltage)
Center of the waveform
B
symmetry
+ 0.7
– 0.6
1 track jump waveform
CN302
JW003
(ADJ)
JW004
(AFADJ)