HCD-FX200/FX205
10
SECTION 4
ELECTRICAL CHECK
CD SECTION
Note:
1. CD Block is basically constructed to operate without adjustment.
2. Use YEDS-18 disc (Part No. 3-702-101-01) unless otherwise indicat-
ed.
3. Use an oscilloscope with more than 10 M 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 pick-up block is replaced.
FOCUS BIAS CHECK
+
–
BD73U board
oscilloscope
(DC range)
CL102 (RFOUT)
CL117 (VREF)
Procedure:
1. Connect the oscilloscope to CL102 (RFOUT) and CL117
(VREF) on the BD73U board.
2. Press the [
?/1
] button to turn the power on, and press the
[FUNCTION] button to select CD function.
3. Set disc (YEDS-18) and press the [u] button to playback.
4. Confi rm that oscilloscope waveform is as shown in the fi gure
below (eye pattern).
A good eye pattern means that the diamond shape () in the
center of the waveform can be clearly distinguished.
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level:
1.1 ± 0.4 Vp-p
Checking Location:
– BD73U Board (Conductor Side) –
IC101
CL102
(RFOUT)
CL117
(VREF)
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