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R720
R721
R722
R723
R724
R725
RF PATTERN TESTING
J215
TESTING PROCEDURE
(1) Load the test disc (Sony Test CD YEDS-7) and set the unit into PLAY mode.
(2) Connect the scope to C3 (Pin 4 of IC701) and DGND (J215).
Scope setting:
(3) Observe the waveform is 1.5V p-p +/-5% and the eye pattern is at its best shape (see FIG. 1).
FIG. 1 (a)
3T 4T 5T – 11T
R715
R714
R713
R712
R711
R710
R709
C723
C719
R65
R708
C716
C705
C717
R707
R705
R706
C718
JR701
C706
J220
Test Point
NAD - C 546BEE PCB TESTING POINTS DIAGRAM
Coupling
Vertical sensitivity
Horizontal time base
C785
C742
C740
R702
C711
C712
C713
: AC.
: 0.2 V/ div.
: 0.5 µS/div.
FIG. 1 (b) Poor eye pattern
FIG. 1 (C) Good eye pattern
- 9 -
R50
C745
R748
C28
C74
C29 C52
PCB-C54626+SERVO
1725-970B+000B
R
C56
C
R
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