Self Diagnosis - Canon NP6317 Service Manual

IX. SELF DIAGNOSIS
The DC controller PCB has a microprocessor that diagnoses the functions of the copier (par-
ticularly the sensors) at appropriate intervals. If this microprocessor detects an abnormality, it will
display the type of the abnormality on the indicator on the control panel.
The table below shows the various fault codes, their meaning, and the corresponding detection
timing.
Example of E000 code indication:
E 000 light alternately.
Code displayed
E000
E001
E002
E003
E004
E010
E030
COPYRIGHT © 1999 CANON INC.
Main cause
Fixing roller heater (LA1) low tem-
perature error
Thermistor1 (TH1), Power supply as-
sembly, Fixing roller heater (LA1), or
DC controller PCB
Fixing roller heater (LA1) low tem-
perature error:
Thermistor, fixing roller heater, AC
driver, power supply assembly, DC
controller PCB, thermoswitch (F1),
auxiliary thermistor (TH2)
Fixing roller heater (LA1) low tem-
perature error:
Thermistor (TH1), fixing roller heater,
power supply assembly, DC controller
PCB, thermoswitch (F1), auxiliary
thermistor (TH2)
Fixing heater ON timing error:
Triac (U104) on power supply assem-
bly
Main motor error:
Main motor (M1), DC controller PCB
Counter (CNT1), DC controller PCB
CANON NP6317 REV.0 APR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 10 TROUBLESHOOTING
Fault criteria
• If the temperature difference between
the thermistors 1 and 2 is 60°C or
higher.
• If the fixing asssembly temperature is
lower than 50°C after 15 sec from the
power-on.
If the tempereture remains 220°C or
higher for 0.1 sec or longer.
If warm-up is not over after 60 sec
from when the temperature reached
50°C.
If fixing unit temperature drops below
50°C when the copier is in stand by or
copying.
If the C HEAT CHECK signal is on
while the HEAT ON signal is off.
If the main motor speed feedback sig-
nal does not appear after 2 sec from
the main motor.
If the break signals is generated con-
tinuously for 0.1 sec or more when the
counter is not being driven.
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