Sony CX-J3000 Service Manual page 16

CX-J3000/J3000M
CD SECTION
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
Focus Bias Check (J3000)
1. Connect the oscilloscope to TP (RF) and TP (GND) on the
CD board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the Y 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)
VOLT/DIV: 200 mV (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.
Adjustment Location:
− CD BOARD (Conductor Side) −
IC701
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0.85 ± 0.2 Vp-p
TP (GND)
TP (RF)
Focus Bias Check (J3000M)
1. Connect the oscilloscope to TP (RF) and TP (VREF) on the
CD/MP3 board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the Y 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)
VOLT/DIV: 50 mV (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.
Adjustment Location:
− CD/MP3 BOARD (Side B) −
TP (RF)
TP (VREF)
0.85 ± 0.2 Vp-p