Troubleshooting Malfunction - Canon GP405 Service Manual

CHAPTER 14 TROUBLESHOOTING
IV. TROUBLESHOOTING MALFUNCTION
1. Before starting the troubleshooting work, check the error history using
COPIER>DISPLAY>ERR in service mode. (E202 is indicated only on the Error History
screen, and cannot be checked without executing this service mode.)
2. For troubleshooting the feeder, sorter, or cassette pedestal, refer to its respective Service
Manual.
3. If E000, E001, E002, E003, E004, or E717 is indicated, clear the error by executing the
following before taking corrective action:
FUNCTION>CLEAR>ERR.
4. The connectors on the machine's PCBs do not allow insertion of meter probes. Obtain a probe
extension (FY9-3038/3039; see p. 14-29).
1 E000 (The Fixing Temperature Failure message turns on.)
Cause
Relay connector
(J426; thermistor)
Thermistor
Thermistor
heater
Thermal switch
Composite power
supply PCB
Relay connector
14-56
Step Check
1 Clear the error in service mode.
2 Is the connection of the connector
J426 normal?
3 Wait until the fixing assembly has
cooled adequately; then, disconnect
J426, and measure the resistance of
the thermistor. Is the reading as
follows?
(The resistance varies depending on
temperature. Use the following for
reference.)
• J426 (white, TH1) about 1000 to
1400 kΩ
• J426 (black, TH2) about 40 to
50 kΩ
4 Disassemble the fixing assembly,
and check to see if the thermistor is
mounted correctly. Is the thermistor
in contact with the upper fixing
roller correctly?
5 Disconnect J496, and measure the
resistance on the heater side. Is it as
follows?
between J496-1 and -3: several Ω
between J496-2 and -3: several Ω
6 Is there continuity on the thermal
switch? Is it positioned correctly?
7 Is a specific voltage supplied by the
composite power supply?
between J201-1 and -4: about 100
VAC
8 Are the relay connector (J498,
J447) connected correctly?
COPYRIGHT © 1999 CANON INC. CANON 405/335 REV.0 JAN. 1999 PRINTED IN JAPAN (IMPRIME AU JAPON)
Yes/No Action
NO Re-connect the
connector.
NO Replace the thermistor.
NO Re-mount the
thermistor.
NO Replace the heater
NO Replace or mount the
thermal switch correctly.
NO Replace the composite
power supply PCB.
NO Re-connect them.