Read Sony CDP-XB820 Service Manual online
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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%
Confirm the following :
A/B x 100 = less than ± 22%
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.
(DC voltage) is step 6.
8. Disconnect the lead wire of TP1 (ADJ : JW98) connected in
step 1.
0 V
Center of the waveform
A (DC voltage)
B
Traverse waveform
level: 1.3
±
0.6 Vp-p
Adjustment Location :
[ BD BOARD ] — Side A —
[ MAIN BOARD ] – Conductor Side –
0 V
C (DC
voltage)
voltage)
Traverse waveform
Tracking servo
Sledding servo
Sledding servo
ON
Tracking servo
Sledding servo
Sledding servo
OFF
RF PLL Free-run Frequency Check
Procedure :
1. Connect frequency counter to test point (MNT1) with lead wire.
1. Connect frequency counter to test point (MNT1) with lead wire.
2. Turn ON the power.
3. Put the disc (YEDS-18) in to play the number five track.
3. Put the disc (YEDS-18) in to play the number five track.
Confirm that reading on frequency counter is 4.3218MHz.
TP9 (MNT1)
BD board
frequency counter
+
–
–
TP
(VC)
(VC)
TP4
(TE)
(TE)
TP2
(FE)
(FE)
TP3
(FEI)
(FEI)
TP1
(RF)
(RF)
IC103
IC102
IC101
TP9
(MNT1)
(MNT1)
IC930
JW096
TP2
(AFADJ)
(AFADJ)
JW098
IC302
CN302
TP1
(ADJ)
(ADJ)
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