Electrical Adjustment - Sony XDR-S100CD Service Manual

XDR-S100CD
CD SECTION
Note:
1. CD Block is basically constructed to operate without adjustment.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10 MŸ impedance.
4. Clean the object lens by an applicator with neutral detergent when the
signal level is low than specifi ed value with the following checks.
5. Check the focus bias check when optical block is replaced.
FOCUS BIAS CHECK
BD81A board
TP (RFACO)
TP (VC)
Procedure:
1. Connect the oscilloscope to TP (RFACO) and TP (VC) on the
BD81A board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the [CD ] button.
u
4. Confi rm that the oscilloscope waveform is as shown in the fi g-
ure below. (eye pattern)
A good eye pattern means that the diamond shape (¡) in the
center of the waveform can be clearly distinguished.
• RF signal reference waveform (eye pattern)
VOLT/DIV: 0.2 V (with the 10: 1 probe in use.)
TIME/DIV: 500 ns
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
18
SECTION 3
ELECTRICAL ADJUSTMENTS
oscilloscope
(DC range)
+
–
1.1 0.2 Vp-p
Checking Location:
– BD81A BOARD (Conductor Side) –
TP (VC)
TP
(RFACO)