Pioneer AVH-X8500BHS Service Manual page 59

5
Check 11: Is the video circuit OK?
<Outline> Composite signal and component signal are output from DVD-LSI (IC1501), and are output from the
HOST I/F (CN1952) via a buffer circuit.
IC1501
DVD_LSI
Composite
Video
DAC
section
<Checking method> Playback DVD-REF-A1 TITLE2 CHAPTER5 (WHITE 100%), and monitor COMPOSITE signal with
an oscilloscope with GNDV (stylus) being the reference. Set the trigger mode to "TV trigger" and
the trigger line to "150 line".
No. Check point 1 (stylus)
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
Fig 11.2: Waveform for the case of composite white 100% output
Side A
Fig 11.3: VIDEO signal check point
5
6
Fig 11.1: Video circuit
Specification value
1000 mVpp ± 5%
Color burst
Horizontal sync signal
COMPOSITE
GNDV2
AVH-X8500BHS/XNUC
6
7
CN1952
HOST I/F
COMPOSITE
Reference waveform
Waveform 6
PEAK
Reference
value
BOTTOM
7
8
A
B
C
D
E
F
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