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Forcus Bias Adjustment
Note:
1. CD Block is basically designed to operate without adjustment.
2. Use YEDS-18 disc (3-702-101-01)
3. Use an oscilloscope with more than 10 MΩ impedance.
4. Clean the object lens by an applicator with lens cleaning liq-
uid when the signal level is low than specified value with the
following adjustment.
5. Adjust the focus bias adjustment when optical block is replaced.
Focus Bias Adjustment
MAIN R237 board
TP (RFO)
TP (VC)
Procedure :
1.
Connect oscilloscope to TP101(pin 1: RFO) and TP101 (pin
3: VC) on MAIN R237 board.
2.
Press the
button to turn the power on.
I/1
3.
Put test disc (YEDS-18) in and press the u button to play-
back.
4.
Adjust VR102 so that oscilloscope waveform is as shown in
the figure below. (eye pattern)
A good eye pattern means that the diamond shape (
center of the waveform can be clearly distinguished.
5.
After adjustment, check the RF signal level.
SECTION 4
ELECTRICAL ADJUSTMENT
oscilloscope
(DC range)
+
–
) in the
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
10: 1
level:
+0.3
1.0
Vp-p
- 0.2
Adjustment Location:
– MAIN R237 BOARD (Conductor Side) –
TP101
(Pin 1 : RFO)
TP101
(Pin 3 : VC)
VR102
FOCUS BIAS
ADJUSTMENT
19
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