Pioneer CX-3250 Service Manual page 74

1
Check 11: Is the video circuit OK?
A
<Outline> Composite signal and component signal are output from DVD-LSI (IC1501), and are output from the
HOST I/F (CN1901) via a buffer circuit.
IC1501
DVD_LSI
Composite
Video
DAC
B
section
<Checking method> Playback DVD-REF-A1 TITLE2 CHAPTER5 (WHITE 100%), and monitor COMPOSITE signal with
an oscilloscope with GNDV1 (stylus) being the reference. Set the trigger mode to "TV trigger" and
the trigger line to "150 line".
Check point 1 (stylus)
C
NO.
1 COMPOSITE
In case of NG, check the applicable line, the periphery of the major components in the drawing above, soldering of the
peripheral components and defective components.
COMPOSITE signal
Pedestal level
D
E
F
74
1
2
Fig 11.1: Video circuit
Specification value
1 000 mVpp ± 5 %
Color burst
Horizontal sync signal
Fig 11.2: Waveform for the case of composite white 100% output
AVIC-X930BT/XNUC
2
3
COMPOSITE
Reference waveform
Waveform 6
PEAK
Reference
value
BOTTOM
3
4
CN1901
HOST I/F
4