Remedy: 1) Defective DC controller PCB Action: Replace it.
Code: E197
Display: E197
Description: Engine communication error
Remedy: 1) Fault on the DC controller PCB Action: Replace the DC controller PCB.
Code: E747
Display: E747
Description: Fault in the interface controller memory
Remedy: 1) Fault on the interface controller PCB Action: Replace the interface controller PCB.
Code: E805
Display: E805
Description: Fan (FM721) Failure
Remedy: 1) Defective cooling fan Action: If a voltage between the J123-1 and J123-3 on the DC controller PCB changes from 0 V to 24 V right after turning on the printer, replace the cooling fan. 2) Poor contact in the cooling fan drive connector Action: Reconnect the J213 for the cooling fan and J123 on the DC controller PCB. 3) Defective DC controller PCB Action: Replace it.