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Hitachi VK-S274R Service Manual page 19

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Troubleshooting > Trouble Diagnosis
(4) No zoom and focus operation
NG
TL1301:7.2V
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
W h e n p o w e r
NG
t u r n e d o n :
T L 1 3 4 5 : P u l s e
OK
OK
T L 1 3 4 7 t o 1 3 5 0 :
P u l s e s
NG
NG
I C 1 3 0 2 - 2 , 4 , 2 4 : 3 V
OK
2
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
L1301 faulty
on the PC circuit board.
The test lands and components of circuit no. 1500 and higher
are on the CSR circuit board.
connections of the
Lens unit faulty.
Check the 3V line
Check the 7.2V (VM)
line
IC1201 faulty
IC1201 faulty.
IC1201 faulty.
IC1201 faulty.
L e n s u n i t f a u l t y .
C h e c k t h e 3 V l i n e
Check the
NG
lens flat cable.
OK
NG
TL1346:3V
Check the 3V line
OK
NG
TL1335:Pulse
OK
Lens unit 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 - 5
Correct the
connections
of the cable.
IC1201 faulty.
R1215 faulty.
Q1201 faulty.
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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