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RCD-W7V
SERVO Check
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 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
IC4B1 1 pin
IC4B2 1 pin
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.
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
BD board
TP4B3 (IC4B1 ra pin)
IC4B2 1 pin
20
oscilloscope
11T
3T
3T= 0.55 ± 0.07Vp-p
11T= 0.90 ± 0.13Vp-p
oscilloscope
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.
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)
TP4B3 (TE)
IC4B2
R4B4
IC4B1
TP (IC4B1 1 pin)(RF)
center of
waveform
B
A (DC voltage)
symmetry
VC (IC4B2 1 pin)
TP4B2 (FE)
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