E002/E003 - Canon NP7160 Service Manual

CHAPTER 10 TROUBLESHOOTING

3. E002/E003

Cause
Step
Main thermistor
Sub thermistor
(TH2)
Thermistor
(TH1, TH2)
Thermistor
(TH1, TH2)
Operating
environment
DC controller PCB
10–44
COPYRIGHT © 1998 CANON INC.
Checks
1 Execute service mode '412' (error clear) to
clear E002 or E003. Open the front door and
the top unit, and let the fixing roller cool
sufficiently.
Turn on the power switch. Does any of the
following apply?
• The fixing heater fails to turn on.
• E000
2 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.)
3 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 temperature display)
Does the reading remain unchanged at
'110'? (After the check, be sure to turn off
the power switch.)
4 Is the thermistor in even contact with the
upper fixing roller?
5
Clean the area of contact of the thermistor. Is
the problem corrected?
6 Is the operating environment as indicated?
Yes/No
CANON NP7161/NP7160 REV.0 AUG. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
Actions
YES
See the appropriate section.
YES
Check the wiring from J108
on the DC controller PCB to
the thermistor; if normal,
replace the thermistor.
YES
Check the wiring from J109
on the DC controller PCB to
the thermistor; if normal,
replace the thermistor.
NO
Mount the thermistor
correctly.
YES
End.
NO
• 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.
YES
Replace the DC controller
PCB.