Code :

Code: E078
Display: E078
Description: Secondary transfer roller engaging mechanism abnormality
Remedy: 1) Poor contact in the roller engaging sensor connector Action: Reconnect the J714 for the roller engaging sensor and J115 on the DC controller PCB. 2) Poor contact in the roller engaging clutch connector Action: Reconnect the J114 on the DC controller PCB. 3) Defective roller engaging clutch Action: Disconnect the J114 on the DC controller PCB. Measure resistance between the J114-2 and J114-1. If the result is not about 150 Om, replace the roller engaging clutch. 4) Defective spring for the engaging lever Action: If it is out of place, reset it properly. If it is deformed, replace it. 5) Defective engaging lever Action: Replace the secondary transfer roller or engaging lever. 6) Defective roller engaging cam Action: Replace the EP-87 drum cartridge. 7) Defective roller engaging sensor Action: Replace the main drive unit. 8) Defective DC controller PCB Action: Replace it.

Code: E100
Display: E100
Description: Optical Unit (Laser/scanner Unit) Failure
Remedy: 1) Poor contact in the laser drive signal line connector Action: Reconnect the J11 on the laser driver PCB and J102 on the DC controller PCB. 2) Poor contact in the BD detection line connector Action: Reconnect the J131 on the BD PCB and J103 on the DC controller PCB. 3) Poor contact in the scanner motor connector Action: Reconnect the J221 for the scanner motor and J103 on the DC controller PCB. 4) Defective laser/scanner unit Action: Replace it. 5) 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.

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