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I
XG-NV4SU
TROUBLE SHOOTING TABLE
(Continued)
1 Checking IC801 (RGB signal output circuit)
1
NO
Are there RGB output waveforms
at
NO
pins (31), (32) and (33) of IC801?
l
-------
----
----9
l Go to "No color or unusual tone", "No
I
t Y signal" or "Out of sync".
I
-I----
----
------
I
Yes
----I
I
-----------
1
Check
the data transfer
and other I
l performance
at pins (17) and (18) of
I
Are there output waveforms at the
1
video IC801.
No
- - - - - - - - - - - - - - - -I
emitters of Ql501,
Ql502
and
Ql503?
\
Yes
Are A/D outputs of IC1504, ICI505
NO
- - - - - - - - - - - - - - - -'
and ICI506
as specified?
I
Yes
Are there signal inputs at pins (12)
(Y signal) and (19)(chroma signal) of
P402?
1
yrI3
______
Yes
I
Go to
"Checking
thevideo
unit
I
I
circuit".
I
--I)---
-----
---I-
I
Are there output waveforms
at pins
(3)(chroma signal) and (6)
6~~
(Y signal)of IC816?
Checking the chroma and Y signals of IC801
(RGB signal output)
I
\
Yes
rCTheckthe
~w~chin~ ibthei';_
'
I peripheral circuits. If there is no signal
'
I at pins (9) and (1) of IC816, check 3-D
I
I noise reduction circuit (IC806).
I
L - - - - - - - - - - - - - - -
I
Are there signal inputs at pins (20)
, check
&iOi
73i-n%"
redu%;
(chroma signal) and (21) (Y signal)
No
I
circuit) and its peripheral circuits.
I
r
---I--I-------II
I
of IC801?
------I
--q
Yes
I
I
Check IC801 and~t~p~ri~h~al
I
; -0
-t;
yc;e;kT;
;c-o;
;,,
7
I
circuits.
I
-
I
-
-
I
I
I
I
I
I
I
-
-
-
-
- I
I signal output circuit)".
I
-----II-
-------
--
I
33
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