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XG-NV4SU
I
TROUBLE SHOOTING TABLE
(Continued)
Checking the video system
Is the lamp on?
I
No
1
Yes
Is specified voltage fed to EA
connectors?
I Yes
I
I
III---I
I----I-q
I
No
I
I
I
Go to "Lamp fails to light-up".
I
-----I
----------
l
I
--II----
----II-9
I
t Check the power circuit and its parts
I
*I
----
------------
I
Are there signal inputs at pins (3) and
NO
(29) of P402?
I
Yes
Are there signals at pin (4) of IC401
Are there signal outputs at pins (3)
and (6) of lC816?
Yes
No
l____p!____
I
Check the video unit circuit
I I
check
the_scillation
circuit
I
I
----II
Y
----I
l
Go
to "Checking IC801
I
(RGB signal output circuit)"
I
7'
I
l I
. I
I l
v
II----------
Check IC816, lC806 and
their peripheral circuits as
well as switching circuit.
9
I
I
I
I
I
I
L
(IC6004 and its peripheral
I ;
of IC401 and IC402, and
circuits).
I I
their peripheral circuits.
I
---------
--
1 L-----------
1
L---------I-
1
L-----------
1
I
Checking the video unit circuit
I
Is there video signal output at pin (7)
No
of IC6001?
I
_-------
--------
Yes
I
l
Check the IC6001 selector switch,
i
I
terminal voltage and input circuit.
Is there video signal input at IC6004?
No
----------------
I
------I
Yes
I
---q
I
Check the low-pass-aidbuffer
I
I
circuits of Q6009 thru Q6015.
I
- - - - - - - - - - - - - - - -
I
Are there signal outputs at pins (6)
NO
and
(8) of IC6004?
I
I
I
__
Yes
I
/
I
Check IC6004 and its peripheral
I
I
circuits (bias).
I
----------------
l
Check the low-pass and buffer circuits
No
of Q6002 thru Q6008. Is the signal as
specified?
-------
--------
I
I
Yes
I
I
------I
--------
I
I
I
'
l
Go
to "Checking IC801 (RGB signal
I
I
output circuit)".
I
----------------
l
I
Check Q6002 thru Q6008 and their
I
peripheral circuits.
I
---------------
l
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