The Lens Fails To Move - Canon NP6251 Service Manual

47. The lens fails to move.

Cause Step
Rail
Drive belt
DC power
supply
DC controller
PCB
Lens motor
(M4, M5)
COPYRIGHT © 1997 CANON INC.
Checks
1 Turn off the power switch, and
disconnect the power plug from
the power outlet. Does the lens
move smoothly when the pulley of
the lens motor is moved by hand?
2 Is the drive belt attached
correctly?
3 Set the meter to the 30VDC
range, and connect the probes to
the connectors J305-1 (+) and
J305-2 (–) on the DC controller
PCB. Is there 24 VU (DC)?
4 Set the meter to the 200 range,
and connect the probes of the
meter to the connectors of the
lens motor indicated; is the
resistance between connectors as
indicated?
Motor +
X motor J110A-1
(M4) J110A-4
J110A-1
J110A-2
J110A-4
J110A-5
Y motor J110A-10
(M5) J110A-13
J110A-10
J110A-11
J110A-13
J110A-14
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
YES/NO
– Resistance
J110A-2
about 135
J110A-5
J110A-3
J110A-3
about 48
J110A-3
J110A-3
J110A-11
about 135
J110A-14
J110A-12
J110A-12
about 48
J110A-12
J110A-12
CHAPTER 11 TROUBLESHOOTING
Action
NO Check the rail for foreign
matter and dirt. Clean,
as necessary.
NO Attach the belt correctly.
NO See "DC power is
absent."
YES Replace the DC
controller PCB.
NO Replace the lens motor.
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