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Hitachi VK-S274R Service Manual page 23

Color & b/w video camera
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Troubleshooting > Trouble Diagnosis
(8) No auto focus operation
Does zoom
NG
operate
normally?
OK
The test lands and components of circuit no. 1000-1099 are on the SP circuit board.
Connect an
The test lands and components of circuit no. 1100-1499 are on the PC circuit board.
oscilloscope
The test lands and components of circuit no. 1500 and higher are on the CSR circuit board.
to video output
NG
VIDEO SIGNAL:
360mVp-p or more
OK
Set the zoom to the
wide-angle end.
Point at the objects
from the infinity to
close-up ends.
Is there a point at
NG
which focus is obtained
between the infinity
and close-up ends?
OK
Data Initialize and
adjust auto focuss.
NG
Does autofocus
operate normally?
OK
Note: For the item marked
the adjustments required when the
END
unit is data initialized, before
adjusting auto focus.
See "(4) No zoom and
focus operation."
Increase the
illumination
of the subject.
NO
Does the video
Camera circuit faulty.
level increase?
YES
NG
TL1345:Pulse
OK
3
IC1201 faulty.
, perform all
C h e c k t h e
NG
c o n n e c t i o n s o f t h e
l e n s f l a t c a b l e .
OK
NG
C h e c k t h e 3 V l i n e
T L 1 3 4 6 : 3 V
OK
NG
T L 1 3 4 4 : P u l s e
OK
L e n s u n i t f a u l t y .
4 - 9
C o r r e c t t h e
c o n n e c t i o n s
o f t h e f l a t c a b l e .
I C 1 2 0 1 f a u l t y .
R 1 2 1 4 f a u l t y .
Q 1 2 0 1 f a u l t y .

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