CFD-V27
Focus Bias Check
This check is to be done when the optical block replaced.
Check Procedure:
1. Connect the oscilloscope to test point TP (VC) and TP (RF) on
MAIN board. Insert disk (YEDS-18).
2. Put the set into test mode.
3. Opitical pick-up setting to the center by + or – button pushing.
4. Press the u button and press the DISPLAY ENTER button.
(Tracking servo ON)
5. Check that the oscilloscope wavewform 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.
6. Release test mode after adjustment is completed.
• RF signal reference waveform (eye pattern)
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensivity.
[MAIN BOARD] (Conductor side)
TRAVERSE Check
This check is to be done when the optical pick-up block is replaced.
Check Procedure:
1. Connect the oscilloscope to test point TP (VC) and TP (TE) on
MAIN board. Insert disk (YEDS-18) .
2. Put the set into test mode.
3. Optical pick-up setting to the center by > or . button
pushing.
4. Press u button.
5. Check that the oscilloscope traverse waveform is symmetrical,
as shown in the figure below.
6. Release test mode after adjustment is completed.
[MAIN BOARD] (Conductor side)
VOLT/DIV : 0.2V
TIME/DIV : 500n
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