Hitachi VK-U174 Service Manual page 24

Troubleshooting > Trouble Diagnosis
(4) No zoom and focus operation
No
TL4023 : 6V
Yes
When power turned
No
on: TL4021 or
IC2507-41 : Pulse
Yes
TL4008 to 4011 or
Yes
IC4001-28, 26, 30,
24 : Pulses
No
No
IC4001-8 : 3V
Yes
W h e n p o w e r t u r n e d
No
o n : T L 4 0 0 5 o r
I C 2 5 0 7 - 3 9 : P u l s e
Yes
T L 4 0 0 1 t o 4 0 0 4 o r
Yes
I C 4 0 0 1 - 1 2 , 1 4 , 1 0 ,
1 6 : P u l s e s
No
No
I C 4 0 0 1 - 3 3 : P u l s e
Yes
No
I C 4 0 0 1 - 3 2 : P u l s e
Yes
No
I C 4 0 0 1 - 3 8 : P u l s e
Yes
No
T L 4 0 2 4 : P u l s e
Yes
I C 4 0 0 1 f a u l t y .
IC3002 faulty
connections of the
Lens faulty.
Check the 3V line
c o n n e c t i o n s o f t h e
L e n s f a u l t y .
I C 2 5 0 7 f a u l t y .
I C 2 5 0 7 f a u l t y .
I C 2 5 0 7 f a u l t y .
I C 2 5 0 2 f a u l t y .
Circuit No.
1000 to 1099
1100 to 2999
3000 and higher
Check the
Correct the
No
connections
lens flat cable.
of the cable.
Yes
No
TL4006 : 3V Check the 3V line
Yes
TL4022 or IC2507faulty.
No
R4002 faulty.
IC2507-30 :
Q4001 faulty.
Pulse
Yes
Lens faulty
C h e c k t h e
C o r r e c t t h e
No
c o n n e c t i o n s
l e n s f l a t c a b l e .
o f t h e f l a t c a b l e .
Yes
No
C h e c k t h e 3 V l i n e
T L 4 0 0 6 : 3 V
Yes
T L 4 0 0 7 o r I C 2 5 0 7 f a u l t y .
No
R 4 0 0 1 f a u l t y .
I C 2 5 0 7 - 3 3 :
Q 4 0 0 1 f a u l t y .
P u l s e
Yes
L e n s f a u l t y .
4 - 5
Circuit Board
SP
PC
CSR