Canon IR5000 - iR B/W Laser, Service Handbook

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CHAPTER 5 SELF DIAGNOSIS
5-13
1.2 Self Diagnosis of the ADF
When the machine's self diagnosis mechanism has turned on, the condition can be reset
by turning off and then on the host machine's power switch.
If the machine must remain out of order, prints may still be made by disconnecting the
machine's lattice connector, and placing an original on the host machine's copyboard glass.
E412
Main Cause The cooling fan (FM1) is faulty. The ADF controller PCB is faulty.
Mode of
Detection
0001 While the cooling fan is being driven, the lock signal (FMLCK)
arrives for 100 msec or more.
E420
Main Cause The EEPROM is faulty. The ADF controller PCB is faulty.
Mode of
Detection
0001 When the host machine's power switch is turned on, the backup
data of the EEPROM cannot be read or the data, if read, has an er-
ror.
E421
Main Cause The EEPROM is faulty. The ADF controller PCB is faulty.
Mode of
Detection
0001 Backup data cannot be written to the EEPROM or the data, if writ-
ten, has an error.
E422
Main Cause The IPC communication has an error. The communication line has an open
circuit. The ADF controller PCB is faulty.
Mode of
Detection
0001 While the machine is in standby, the communication with the host
machine has been interrupted for 5 secs or more. or, while the ma-
chine is in operation, the communication with the host machine has
been interrupted for 0.5 sec or more.