Service manual
XG-XVI
E/A
TROUBLE SHOOTING TABLE
(Continued)
j
I
Checking the video system
I
Is the lamp on?
No
I
-------_-------~
t
I
I
Go to “Checking lamp light-up”.
I
-------_--------I
Is specified voltage fed to EA and EB
No
connectors?
I Yes
I
----------------
t
Check the power circuit and its parts.
;
I
-----_--______--I
Are there signal inputs at pins (9) and
No
(14) of
IC408?
Yes
Are X401 and X402 oscillating?
Are there signal outputs at pins (3)
t
Check the video unit circuit
t
t
Check the oscillation circuit
I
I
(IC6004
and its peripheral
t
t
of
IC401
and
IC402,
and
I
------------
I------------
t circuits).
t
t
their peripheral circuits.
t
t
Go to “Checking
IC801
tt
CheckIC816,IC806and
f
L___________
I
L___________
1
i
tRGB
‘bnal
output
circuit)“.
t
t
their peripheral circuits as
I
1
,
I
we,l
as
switching
circuit,
L---s-------
----------mm
1
I
Checking the video unit circuit
I
Is there video signal output at pin (7)
No
of
IC6001?
I
---------------_
Yes
I
I
Check the
IC6001
selector switch,
t
+
;
terminal
v.oltage
and input circuit.
No ----.------------
I
Is there video signal input at
IC6004?
r
1
Yes
I
----------______
I
Check the low-pass and buffer
t
I
circuits of Q6009 thru
Q6014.
I
I
---------_______I
Are there signal outputs at pins (6)
No
and (8) of
IC6004?
I
1
Yes
I
I
Check
IC6004
and its peripheral
t
I
circuits (bias).
I
I
---------_______I
Check the low-pass and buffer circuits
No
of Q6002 thru
Q6008.
Is the signal as
specified?
__-----------_-_
Yes
I
Go to “Checking the
IC401
and
f
,
IC402
oscillation circuit and its
t
*
;
peripheral circuit”.
I
I
--------------__
____------------I
t
I
i
Go to “Checking
IC801
(RGB
signal
t
output circuit)“.
I
----------------I
36