36
PG-C30XU
TROUBLE SHOOTING TABLE (Continued)
Checking IC806 (3-D noise reduction circuit)
and its peripheral circuits
Yes
No
Check the buffer circuit of Q814 thru
Q816 as well as Q903 thru Q906.
Yes
No
Are there signal outputs at pins (55)
(Y signal) and (51)(chroma signal) of
IC806?
Check IC806, IC807 (memory) and
their peripheral circuits.
Yes
No
Are there signal outputs at the
emitters of Q817 (Y signal) and Q910
(chroma signal)?
Check the low-pass circuit around
Q817, Q907 and Q910.
Check IC816 and IC801 (RGB signal
output circuit).
Are there signal inputs at pins (40)
(Y signal) and (45)(chroma signal) of
IC806?
No color or unusual tone (NTSC, PAL)
Yes
No
Go back to the signal processing
block.
Yes
No
Check the oscillation of X801 and
X802, and their peripheral circuits.
Check IC803, IC814 and their
peripheral circuits.
Are there signal outputs at pins
(46)(R-Y) and (45)(B-Y) of IC801?
Is there chroma signal input at pin
(20) of IC801?
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