Sony RCD-W1 Service Manual page 20

RCD-W1
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 (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10MΩ 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 board
TP(RFAC)
TP(VC)
Procedure :
1. Connect oscilloscope to TP (RFAC) and TP (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
VOLT/DIV : 200mV
TIME/DIV : 500ns
E-F Balance (1 Track jump) Check
oscilloscope
BD board
TP(RF-TE)
TP(VC)
20
oscilloscope
11T
3T
3T= 0.55 ± 0.07Vp-p
11T= 0.90 ± 0.13Vp-p
Procedure :
1. Connect oscilloscope to TP (RF-TE) and TP (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] (Conductor Side)
TP (RFAC)
center of
waveform
B
A (DC voltage)
symmetry
TP (RF-FE)
TP (RF-TE)
TP (VC)
IC101
TP
(RFDC)
IC401