20
RCD-W7V
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
DVD SECTION
Note :
1. DVD Block is basically designed to operate without adjustment.
Therefore, check each item in order given.
2. Use HLX-503 disc 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 IC4B1
1
pin and IC4B2
1
pin.
2. Turned Power switch on.
3. Load a disc (HLX-503) and playback.
4. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
IC4B1
1
pin
IC4B2
1
pin
BD board
oscilloscope
SERVO Check
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
3T= 0.55
±
0.07Vp-p
11T= 0.90
±
0.13Vp-p
3T
11T
TP4B3 (IC4B1
ra
pin)
IC4B2
1
pin
BD board
oscilloscope
Adjustment Location:
[BD BOARD] (SIDE B)
Procedure :
1. Connect oscilloscope to TP4B3 (IC4B2
1
pin) and IC4B2
1
pin.
2. Turned Power switch on.
3. Load a disc (HLX-503) and playback the number one 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.
E-F Balance (1 Track jump) Check
1
16
48
8
5
1
4
33
17
64
49
32
IC4B1
IC4B2
VC (IC4B2
1
pin)
TP4B2 (FE)
TP4B3 (TE)
R4B4
TP (IC4B1
1
pin)(RF)
