Sony CFD-V5 Service Manual page 12

CD SECTION
How to put the set into CD Test Mode
1. Set the function switch to power off.
2. Set the function switch to CD while
l key and x key pressing.
The set is into CD test mode (88 is displayed).
3. Turn the power off to release test mode.
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 IC701 rj pin (RFO) and GND
on CD board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the u button.
4. Confirm that the oscilloscope waveform is as shown in the fig-
ure below. (eye pattern)
A good eye pattern means that the diamond shape (◊) in the cen-
ter of the waveform can be clearly distinguished.
• RF Signal Reference Waveform (eye pattern)
VOLT/TV : 200mV (10 : 1 probe in use)
TIME/DIV : 500 nS
When observing the eye pattern, set the oscilloscope for AC range
and raise certical sensitivity
[MAIN BOARD] (Conductor side)
8
15
1
5
10
15
16
17
20
25
30
32
RF level
1.5 –2.0 Vp-p
B C E
1
64
60
55
50
49
48
45
40
35
33
oscilloscope
(AC range)
IC701 pin rj
(RFO)
(GND)
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