Viii. Self Diagnosis - Canon CLC 1120 Service Manual

VIII. SELF DIAGNOSIS

A. Copier
The R-CPU and the DC-CPU of the copier's CPU PCB are equipped with a self diagnostic
mechanism to check the state of the machine (particularly, the condition of sensors). The
mechanism runs checks as needed, and indicates a code on the control panel when it finds a fault.
The tables that follow show codes and timing of detection, the latter with discussions of detail
codes indicated in service mode (COPIER>DISPLAY>JAM/ERR).
Code
E000
COPYRIGHT © 1999 CANON INC.
Cause
The discussions that follow are
compiled according to detail code.
· The fixing thermistor is faulty.
· The SSR is faulty.
· The DC driver PCB is faulty.
· The CPU PCB is faulty.
· The fixing thermistor is faulty.
· The fixing heater (H1, H2) has an
open circuit.
· The thermal switch (TP2, TP3) has
an open circuit.
· The SSR is faulty.
CANON CLC1120/1130/1150 REV.0 MAR. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
CHAPTER 13 TROUBLESHOOTING
Timing of detection
xx indicates a heater.
xx=01: upper heater
xx=02: lower heater
xx01 The high temperature
detection circuit on the DC
driver PCB has detected
overheating (220°C or more)
in the middle of the heater.
xx02 The thermistor (THM1/
THM3) has detected 210°C.
xx03 The difference between the
middle and ends in respect of
the thermistor readings is
about 50°C or more.
xx04 The high temperature
detection circuit on the DC
driver PCB has detected
overheating on the ends of the
heater (220°C or more).
xx05 The open circuit detection
circuit on the DC driver PCB
has detected an open circuit in
the heater.
xx21 The temperature does not
increase by 3°C or more in 4
min at power-on (i.e., the
temperature of the fixing
assembly is 100°C or less).
xx31 The temperature does not
increase by 1°C or more in 2
min at power-on (i.e., the
temperature of the fixing
assembly is 100°C or more, or
130°C or more).
xx40 A temperature of 50°C or less
has been detected for 1 sec or
more during standby.
xx50 A temperature of 50°C or less
has been detected for 1 sec or
more during copying.
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