Canon NP6251 Service Manual page 618

3. E002
4. E003
Cause Step
Main thermistor
(TH1)
Main thermistor
(TH1)
Environment
Main thermistor
(TH1)
DC controller
5. E004
Cause Step
Fixing heater
AC driver
DC controller
PCB
COPYRIGHT © 1997 CANON INC.
Checks
1 Execute 'ERROR' in service mode
( ), and turn on the power
4
once again. Is either of the
following correct?
•The fixing heater fails to turn on.
•'E002' or 'E003' is indicated.
2 Is the contact of the connectors
J108 and J2755, relay connector
J2757, and the connector J2745
inside the fixing assembly good?
Further, is the wiring from the
thermistor to the connector J108
on the DC controller PCB good?
3 Is the thermistor in even contact
with the upper fixing roller?
4 Clean the contact area of the ther-
mistor. Is the problem corrected?
5 Does the problem occur only
when the machine is turned on for
the first time in the morning?
6 Replace the thermistor. Is the
problem corrected?
Checks
1 Execute 'ERROR' in service mode
( ). Does the fixing heater
4
turn on immediately after power-
on?
2 Replace the AC driver. Is the
problem corrected?
CANON NP6350/NP6251 REV. 0 JULY 1997 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 11 TROUBLESHOOTING
YES/NO Action
YES Go to the appropriate
section.
NO Connect them securely.
NO Install the thermistor
once again.
YES End.
YES •Advise the user that the
site is out of
specification.
•Advise the user not to
turn on the machine
until the room is warm
enough.
YES End.
NO Replace the DC
controller PCB.
YES/NO Action
NO See "The fixing heater
fails to operate."
YES End.
NO Replace the DC
controller PCB.
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