Sony CDP-XB820 Service Manual page 13

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
0 V
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
0 V
Tracking servo
Sledding servo
OFF
8. Disconnect the lead wire of TP1 (ADJ : JW98) connected in
step 1.
[ MAIN BOARD ] – Conductor Side –
JW096
IC930
TP2
(AFADJ)
JW098
TP1
(ADJ)
IC302
CN302
Center of the waveform
B
A (DC voltage)
level: 1.3 ± 0.6 Vp-p
C (DC
voltage)
Tracking servo
Sledding servo
ON
– 13 –
RF PLL Free-run Frequency Check
Procedure :
1. Connect frequency counter to test point (MNT1) with lead wire.
BD board
TP9 (MNT1)
2. Turn ON the power.
3. Put the disc (YEDS-18) in to play the number five track.
Confirm that reading on frequency counter is 4.3218MHz.
Adjustment Location :
[ BD BOARD ] — Side A —
frequency counter
+
–
TP
(VC)
IC103
TP4
(TE)
TP2
TP3
(FE)
(FEI)
TP1
(RF)
IC102
IC101
TP9
(MNT1)