8
D-CJ500/CJ501/CJ506CK
SECTION 4
ELECTRICAL ADJUSTMENTS
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
FOCUS BIAS CHECK
1. Connect the oscilloscope between TP603 (RF) and GND on
main board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the
B >
button.
4. Confirm 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.
• RF signal reference waveform (eye pattern)
RF level :
0.55
±
0.2 Vp-p
VOLT/DIV : 200 mV
TIME/DIV : 500 ns
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
Test Point:
3
IC601
804
– MAIN Board (Side B) –
