Read Sony CFD-S250L Service Manual online
16
CFD-S250L
IC701
R729
C704
R708
C711
C709
C736
C734
R709
C705
R710
R701
C703
C731
R706
R723
C708
JC703
C743
C742
C707
C739
R735
R733
R734
R736
R711
R713
C732
JW706
JW707
JW709
JW725
JW726
JW708
– CD board (conductor side) –
TP
(RF)
TP
(VREF)
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 4 and pin qa (or
TP (RF) and TP (VREF)).
2. Insert the disc (YEDS-18). (Part No. : 3-702-101-01)
3. Press the N X (CD) button.
4. Confirm that the oscilloscope waveform is as shown in the
3. Press the N X (CD) 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)
Test Point:
RF level :
0.85
0.85
±
0.2 Vp-p
VOLT/DIV : 50 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.
L4
TP (FM IN)
(CONDUCTOR SIDE)
CT1
IC1
IC2
CT3
CT5
L1
L2
T2
T1
L3-2
L3-1
– MAIN board (component side) –
L4
LW
FREQUENCY
COVERAGE
ADJUSTMENT
L2
FM
FREQUENCY
COVERAGE
ADJUSTMENT
CT5, L3-2
LW
TRACKING
ADJUSTMENT
CT3, L3-1
MW
TRACKING
ADJUSTMENT
CT1, L1
FM
TRACKING
ADJUSTMENT
T1
MW
IF
ADJUSTMENT
T2
FM
IF
ADJUSTMENT
TP (VT)
(CONDUCTOR SIDE)
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