Sony RCD-W3 Service Manual page 19

SERVO Check
CD SECTION
Note :
1. CD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc unless otherwise indicated.
3. Use an oscilloscope with more than 10M impedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the fol-
lowing checks.
RF Level Check
BD-R board
IC402 ehpin(RFAC)
IC402 wkpin(VC)
Procedure :
1. Connect oscilloscope to IC402 eh pin (RFAC) and IC402 wk
pin (VC).
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback.
4. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
Note : Clear RF signal waveform means that the shape " " can be clearly
distinguished at the center of the waveform.
RF signal waveform
E-F Balance (1 Track jump) Check
BD-R board
IC402 wg pin(TE)
IC402 wk pin(VC)
oscilloscope
VOLT/DIV : 200mV
IC402 wg pin
TIME/DIV : 500ns
11T
3T
3T= 0.55 0.07Vp-p
11T= 0.90 0.13Vp-p
oscilloscope
Procedure :
1. Connect oscilloscope to IC402 wg pin (TE) and IC402 wk pin
(VC).
2. Turned Power switch on.
3. Load a disc (YEDS-18) and playback the number five track.
4. Press the X button. (Becomes the 1 track jump mode.)
5. Confirm that the level B and A (DC voltage) on the oscillo-
scope waveform.
1 track jump waveform
0V
level=1.3 0.6Vp-p
A
Specified level: –– 100=less than 22%
B
Adjustment Location:
[BD BOARD] (SIDE B)
100
76
1 75
IC402
25
51
26
50
(TE)
30 16
1 15
IC403
IC402 wk pin
(VC)
RCD-W3
center of
waveform
B
A (DC voltage)
symmetry
IC402 eh pin
(RFAC)
19