– 15 –
Adjustment Location
[TCB BOARD] – Component side –
CD SECTION
Note :
1. CD Block basically constructed 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 the oscilloscope with more than 10M
Ω
impedance.
4. Clean an object lens by an applicatior with neutral detergent
when the signal level is low than specified value with the fol-
lowing checks.
Focus Bias Adjustment
This adjustment is to be done when the optical block is replaced.
Adjustment procedure :
1. Connect oscilloscope to test point TP (VC) and TP (RF) on BD
board.
2. Ground main board IC101 (pin
(£
) with the lead wire.
3. Turned power switch ON. (Stop mode)
4. Put disc (YEDS-18) in and press the
(
button.
5. Press the
P
button. (Tracking servo ON)
6. Adjust RV101 so that the oscilloscope waveform is as shown in
the figure below (eye pattern).
A good eye pattern means that the diamond shape (
≈
) in the
center of the waveform can be clearly distinguished.
7. After adjustment, remove the lead wire connecd in step 2.
•
RF signal reference waveform (eye pattern)
When observing the eye pattern, set the oscilloscope for AC
range and raise vertical sensitivity.
Adjustment Location : BD board (see page 16)
S-Curve Check
Procedure :
1. Connect oscilloscope to test point TP (FEO) on BD board.
2. Connect between test point TP (FOK) and TP (GND) by lead
wire.
3. Turned Power switch on.
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
1.3
±
0.3 Vp-p
+
–
BD board
TP (FEO)
TP (VC)
oscilloscope
+
–
BD board
TP (RF)
TP (VC)
oscilloscope
(DC range)
FE1
D1
CV1: SW Tracking Adjustmnet
T1: SW Tracking Adjustment
RV41:
AM Tuned Level
Adjustment
CV2:
SW OSC voltage
Adjustment
T2:
SW OSC voltage
Adjustment
RV42:
FM Tuned Level
Adjustment
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