Pioneer AVIC-X940BT, Руководство по обслуживанию

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AVIC-X940BT/XNUC
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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.
CN1952
HOST I/F
Composite COMPOSITE
Fig 11.1: Video circuit
<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) Specification value Reference waveform
1 COMPOSITE 1000 mVpp ± 5% Waveform 6
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.
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
Side A
Fig 11.3: VIDEO signal check point
IC1501
DVD_LSI
Video
DAC
section
COMPOSITE
GNDV2