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CHAPTER 10 TROUBLESHOOTING
10–42
COPYRIGHT
©
1998 CANON INC. CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Main thermistor
(TH1)
Sub thermistor
(TH2)
Thermistor (TH1,
TH2)
Thermistor (TH1,
TH2)
Operating
environment
DC controller PCB
Execute service mode ‘412’ (error clear) to
clear E000. Open the front door and the top
unit, and let the fixing roller cool sufficiently.
Turn off the power switch, and disconnect
and then connect the power plug.
Turn on the power switch. Does the fixing
heater turn on?
Caution:
Do not repeat the steps without cooling
the fixing roller sufficiently, or abnormal
increase in the fixing temperature will
damage the fixing roller and the
separation claw.
Turn off the power switch, and let the fixing
roller cool sufficiently. Turn on the power
switch, and select service mode ‘109’ (fixing
main thermistor detection temperature
display). Does the reading remain unchanged
at ‘109’?
(After the check, be sure to turn off the
power switch.)
Turn off the power switch, and let the fixing
roller cool sufficiently. Turn on the power
switch, and select service mode ‘110’ (fixing
sub thermistor detection temperature
display). Does the reading remain unchanged
at ‘110’?
(After the check, be sure to tun off the power
switch.)
Is the thermistor in even contact with the
upper fixing assembly?
Clean the area of contact of the thermistor. Is
the problem corrected?
Is the operating environment as specified?
See “The Fixing heater fails to
turn on.”
Check the wiring on the DC
controller PCB to the
thermistor; if normal, replace
the thermistor.
Check the wiring from J109
on the DC controller PCB to
the thermistor; if normal,
replace the thermistor.
Mount the thermistor
correctly.
End.
• Inform the user that the
operating environment
does not meet the
requirements.
• Instruct the user not to turn
on the copier before the
room is warm enough.
Replace the DC controller.
IV. TROUBLESHOOTING MALFUNCTIONS
A. Copier
1. E000
Actions
ChecksStep
Cause
Yes/No
1
2
3
4
5
6
NO
YES
YES
NO
YES
NO
YES