Sony CFD-ZW755 Service Manual page 14

Adjustment Location :
L3 : AM Tracking Adjustment
CT1
FM Tracking Adjustment
CD SECTION
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 ed pin (RFO) and ta
pin (VC) 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
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[MAIN BOARD] (Component side)
FH1
L1
IC1
T1 : AM IF Adjustment
RF level
0.9 – 1.5 Vp-p
– 14 –
CT2 : AM Tracking Adjustment
L4 : AM Frequency Coverage Adjustment
JW13 VT (JW13)
L2 : FM Frequency Coverage Adjustment
IC2
T2 : FM IF Adjustment
Connection point :
[CD BOARD] (Conductor side)
IC701 pin ed (RFO)
JW718
C723
C717
35
715
39
JW711
40
C712 R706
45
C707
R704
R702
R701
C706
R703
oscilloscope
IC701 pin ta (VC)
R710
C766
27 26
30
C739
20
14
JW708
IC701
13
10
C735
5
50
C731
1
52
C709
C727
R
R74
R72