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Hitachi VK-S274R Service Manual page 22

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Troubleshooting > Trouble Diagnosis
( 7 ) N o z o o m o p e r a t i o n
NG
Does focus operate
See "(4) No zoom and
normally?
focus operation."
OK
Check the
NG
zoom switch unit.
OK
When power
NG
turned on:TL1336:
Pulse
OK
OK
TL1331 to 1334:
Pulses
NG
NG
IC1301-2,4,24:3V
OK
NG
IC1301-10,
15:7.2V
OK
NG
TL1311:Pulse
OK
NG
IC1301-23:
Pulse
OK
NG
IC1301-20:
Pulse
OK
NG
IC1301-5:Pulse
OK
IC1301 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
on the PC circuit board.
The test lands and components of circuit no. 1500 and higher
are on the CSR circuit board.
Zoom switch faulty.
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 3 5 : P u l s e
OK
L e n s u n i t f a u l t y .
4 - 8
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 .
IC1201 faulty.
R1215 faulty.
Q1201 faulty.

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