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XG-NV4SU
I
TROUBLE SHOOTING TABLE
(Continued)
Checking IC806 (3-D noise reduction circuit)
and its peripheral circuits
'Are there signal inputs at pins (40)
(Y signal) and (45)(chroma signal) of
L NO
IC806?
I
Yes
------I
II------q
I
1
Check the buffer circuit of Q814 thru
1
Q816 as well as Q903 thru Q906.
I
----------I--
---
I
I
Are there signal outputs at pins (55)
No
(Y signal) and (5l)(chroma
signal) of
IC806?
-------
-------q
Yes
I
l
Check IC806, IC807 (memory) and
I
I
their peripheral circuits.
----------------
l
Are there signal outputs at the
emitters of Q817 (Y signal) and Q910
No
(chroma signal)?
I
-q
Yes
I
-Checkthe
~w~p~s~c&~it~r~u~d
1
I
Q817, Q907 and Q910.
I
l
I
q
I
check
;;I
6andlc8;
(R&&-r;1
1
----------------
I
output circuit).
No color or unusual tone (NTSC, PAL)
Is there chroma signal input at pin
(20) of IC801?
.
NO
Yes
I
l
Go back to the signal processing
I
I
block.
I
Are there signal outputs at pins
No
-_--------------
I
I
(46)(R-Y) and (45)(B-Y) of IC801?
Yes
I
X802, and their peripheral circuits.
1
-------
l
-q
----------------
l
I
Check IC803, IC~l~andtheir
1
I
peripheral circuits.
I
I
34
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