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Hitachi VK-S274R Service Manual page 21

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Troubleshooting > Trouble Diagnosis
(6) No focus lens operation
Does zoom
NG
operate
normally?
OK
When power
NG
turned on:
TL1345:Pulse
OK
OK
TL1347 to1350:
Pulses
NG
NG
IC1302-2,4,24:3V
OK
NG
IC1302-10,15:7.2V
OK
NG
TL1312:Pulse
OK
NG
IC1302-23:Pulse
OK
NG
IC1302-20:Pulse
OK
NG
IC1302-5:Pulse
OK
IC1302 faulty.
The test lands and components of circuit no. 1000-1099 are
on the SP circuit board.
The test lands and components of circuit no. 1100-1499 are
See "(4)No zoom and
on the PC circuit board.
focus operation."
The test lands and components of circuit no. 1500 and higher
are on the CSR circuit board.
Lens unit faulty.
Check the 3V line
Check the 7.2V (VM)
line
IC1201 faulty.
IC1201 faulty.
IC1201 faulty.
IC1201 faulty.
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 - 7
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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