20
RCD-W3
CD-R 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 10M
Ω
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
Procedure :
1. Connect oscilloscope to TP (RRF) and IC302
1
pin.
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.
TP(RRF)
IC302
1
pin
BD-R board
oscilloscope
Note :
Clear RF signal waveform means that the shape “
◊
” can be clearly
distinguished at the center of the waveform.
E-F Balance (1 Track jump) Check
Procedure :
1. Connect oscilloscope to TP (TE1) and PN301
qk
Pin.
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.
RF signal waveform
VOLT/DIV : 200mV
TIME/DIV : 500ns
3T= 0.55
±
0.07Vp-p
11T= 0.90
±
0.13Vp-p
3T
11T
TP(TE1)
PN301
qk
pin
BD-R board
oscilloscope
level=1.3
±
0.6Vp-p
symmetry
A (DC voltage)
center of
waveform
B
0V
1 track jump waveform
Specified level: ––
×
100=less than
±
22%
B
A
Adjustment Location:
[BD-R BOARD] (SIDE A)
C396
C363
R3C6
TP(RRF)
1
75
25
26
100
50
76
51
5
4
1
8
IC302
IC301
[BD-R BOARD] (SIDE B)
R369
TP(TE1)
C380
1
31
2
18
32
4 1
5 8
PN301