46
CX-3311
1
2
3
4
A
B
C
D
E
F
1
2
3
4
Check 11: Is the video circuit OK?
<Outline> Composite and component signal are output from DVD-LSI (IC1501), and are output from the
HOST I/F connector (CN1901).
CN1901
HOST I/F
Component Y
COMPONENT Y
Fig 11.1: Video circuit
<Composite checking method>
Playback DVD-REF-A1 TITLE2 CHAPTER5 (WHITE 100 %), and monitor COMPOSITE signal with
an oscilloscope with “GNDV2” test point (stylus) at the reference. Set the trigger mode to “TV trigger” and
the trigger line to “150 line”.
No.
Check point 1 (stylus)
Specification value
Reference waveform
1
COMPOSITE
Waveform 6
In case of NG, check the applicable line, periphery of major components in the above drawing, soldering of the
peripheral components and defective components.
PEAK
COMPOSITE signal
Reference
value
Color burst
Pedestal level
BOTTOM
Horizontal sync signal
Fig 11.2: Waveform for the case of composite white 100 % output
<Component checking method>
Playback DVD-REF-A1 TITLE2 CHAPTER19 (100 % COLORBAR), and monitor COMPONENT (Y, Cb, Cr)
signal with an oscilloscope with “GNDV2” test point (stylus) at the reference. Set the trigger mode to “TV
trigger” and the trigger line to “150 line”.
No.
Check point 1 (stylus)
Specification value
Reference waveform
2
Y
Waveform 7
In case of NG, check the applicable line, periphery of major components in the above drawing, soldering of the
peripheral components and defective components.
3
Cb
Waveform 8
4
Cr
Waveform 9
IC1501
DVD_LSI
Component Cb
COMPONENT Cb
Component Cr
COMPONENT Cr
Composite
COMPOSITE
Video-
DAC
1000 mVpp ± 5 %
1000 mVpp ± 5 %
700 mVpp ± 5 %
700 mVpp ± 5 %