Sony HCD-V818 Service Manual page 20

E-F Balance (Traverse) Check (With remote commander)
BD board
TP (TE)
TP (VC)
Procedure :
1. Connect oscilloscpe to test point TP (TE) on BD board.
2. Short-circuit SL502 of the video board to GND.
3. Turned Power switch on. Press FUNCTION button to select
CD.
4. Put disc (YEDS-18) in to play the number five track.
5. Press the PLAY MODE 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
0V
Adjustment Location :
[ BD BOARD ] – SIDE A –
TP
(TE)
oscilloscope
+
–
Center of the waveform
B
A (DC voltage)
level : 1.3 ± 0.6 Vp-p
TP TP
(RF) (VC)
TP
TP
(FE)
(FEI)
7. Press the PLAY MODE button. (The tracking servo and sled-
ding servo are turned ON.) Confirm the C (DC voltage) is almost
equal to the A (DC voltage) is step 7.
Traverse waveform
0V
Tracking servo
Sled servo
8. Desolder the short-land (SL502) short-circuited at step 2.
– 20 –
Tracking servo
Sled servo
OFF
ON
C (DC
voltage)