CHAPTER 5 TROUBLESHOOTINGCOPYRIGHT © 2001 CANON INC. 2000 2000 2000 2000 CANON DADF-H1 REV.0 MAR. 20015-305.4 ErrorsError indications can be viewed on the display screen on the host.The table below lists the codes that may be displayed on the host screen, along with theirdefinitions.E420Main causes • ADF controller PCB fault• EEPROM errorHow to detect • Backup data could not be read or backup data read was found in errorwhen the power to the to the host was turned on.E421Main causes • ADF controller PCB fault• EEPROM errorHow to detect • Backup data could not be written to EEPROM.E421Main causes • ADF controller PCB fault• EEPROM errorHow to detect • Backup data written to EEPROM was found in error.E422Main causes • IPC communication error• Disrupted communication line• ADF controller PCB faultHow to detect • Communication between the ADF and the host has been interrupted for 5seconds or longer while the ADF stood by.• Communication between the ADF and the host has been interrupted for0.5 second or longer while the ADF was running.
