Troubleshooting Malfunctions - Canon Image Reader-A1 iR5000i Service Manual

CHAPTER 4 TROUBLESHOOTING IMAGE FAULTS/MALFUNCTIONS

4. Troubleshooting Malfunctions

4.1 Troubleshooting by Malfunction
4.1.1 E000
Thermistor (TH1, TH2)
1) Clear E000, and turn off and then on the main power switch. Make
YES: The thermistor is faulty. Check the following:
Fixing heater (H1, H2; open circuit)
2) Is the electrical continuity of the fixing upper heater normal?
NO:
DC controller PCB, AC driver PCB (faulty)
3) Turn off the main power switch, and let the fixing upper roller cool.
YES: Check the wiring; if normal, replace the DC controller PCB.
NO:
4.1.2 E001
AC driver PCB (fixing heater drive circuit; short circuit)
1) While keeping the main power switch off, let the fixing upper roller
YES: Replace the AC driver PCB.
Thermistor (TH1, TH2), DC controller PCB
2) Try replacing the thermistor. Is the problem corrected?
YES: End.
NO:
4-20 T
the following selections in service mode:
COPIER>DISPLAY>ANALOG. Does <FIX-U> show an increase in
temperature?
• thermistor for mounting condition
• thermistor for soiled surface
• connection
Replace the fixing heater.
Then, turn on the main power switch. Clear E000, and trun off and
then on the main power switch. Make the following in service
mode: COPIER>I/O>DC-CON. Are bit 4 and bit 5 of IO-P12 '0'?
Check the wiring; if normal, replace the AC driver PCB.
cool. While at it, check each thermistor for a soiled surface, poor
mounting, and poor connection.
Turn on the main power switch, and clear E001; then, turn off and
then on the power switch. Make the following selections in service
mode: COPIER>DISPLAY>ANALOG. Is <FIX-U> about 230°C or
higher?
Check the wiring; if normal, replace the DC controller PCB.
COPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON iR5000i/iR6000i REV.0 JUNE 2001