Sony CFD-RG880CP - 6 Electrical Adjustments

CFD-RG880CP
21
SECTION 6
ELECTRICAL ADJUSTMENTS
CD section adjustments are done automatically in this set.
In case of operation check, confi rm that focus bias.
FOCUS BIAS CHECK
1. Connect the oscilloscope between IC701 pin 2 and pin qa (or
TP (RF OUT) and TP (VC)).
2. Insert the disc (PATD-012 (Tr 15)). (Part No. : 4-225-203-01)
3. Press the [
N X
] (CD) button.
4. Confi rm that the oscilloscope waveform is as shown in the fi g-
ure 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)
RF level :
1.0 ± 0.2 Vp-p
VOLT/DIV : 50 mV (10 : 1 probe in use)
TIME/DIV : 500 nS
When observing the eye pattern, set the oscilloscope for AC range
and raise vertical sensitivity.
CD SECTION
Test Point:
FB702
X701
R755
C754
R702
R723
R533
C764
CN701
C701
C708
C709
C716
R724
R780
R511
FB706
CN705
R797
R796
TP743
R794
TP738
TP735
TP734
TP733
TP732
TP731
TP730
TP723
TP724
TP725
TP726
TP727
TP739
TP742
TP741
TP740
TP736
TP737
C781
C514
R517
C710
R701
C759
C702
C703
R706
R707
R709
R710
R716
R718
C711
R722
R717
R719
R721
C704
C715
C712
Q701
C714
1
1
1
1
EB
C
16
4
12
36
25
24 13
37
48
20
60
80
61
21
40
41
IC701
IC702
C726
C725R728
R514
R776
R775
R774
R772
R779
R778
R777
C786
R534
C785
R781
R782
C788
C789
C787
FB705
C510
R513
IC704
R783
R787R788
R784
R799
R798
R795
R791
R773
R771
R733
R734
R731
R727
C722
C721
R732
C719
1
3
4
5
TP (RF OUT)
TP (VC)
– CD BOARD (Conductor Side) –