Read Sony CFD-S38 / CFD-S55 Service Manual online
– 14 –
TP (RFO)
– main board (conductor side) –
Adjustment Location:
CD SECTION
CD section adjustments are done automatically in this set.
In case of operation check, confirm that focus bias.
In case of operation check, confirm that focus bias.
FOCUS BIAS CHECK
1. Connect the oscilloscope between IC701 pin #£ (TP RFO) and
GND on CD board.
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the CD
3. Press the CD
fl 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.
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)
π
Test Point:
RF level :
1.2
1.2
±
0.1 Vp-p
VOLT/DIV : 200 mV (10 : 1 probe in use)
TIME/DIV : 500 nS
TIME/DIV : 500 nS
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
and raise vertical sensitivity.
L3
CT3
TP (VT)
(JW17)
TP
(FM ANT)
AM
TRACKING
ADJUSTMENT
L4
CT1
L1
FM
TRACKING
ADJUSTMENT
L2
FM
FREQUENCY
COVERAGE
ADJUSTMENT
– tuner board (component side) –
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