Remedy: 1) Poor contact in the main motor drive connector Action: Reconnect the connector J701 for the main motor and J105 on the DC controller. 2) Defective main motor Action: Replace it. 3) Defective DC controller PCB Action: Replace it.
Code: E021
Display: E021
Description: Developing rotary motor failure
Remedy: 1) Poor contact in the developing rotary motor drive connector Action: Reconnect the J105 on the DC controller. 2) Defective developing rotary motor Action: Replace it. 3) Defective DC controller PCB Action: Replace it.
Remedy: 1) Poor contact in the developing rotary engaging sensor connector Action: Reconnect the J712 for the developing rotary engaging sensor and J125 on the DC controller PCB. 2) Poor contact in the engaging motor connector Action: Reconnect the J704 for the engaging motor and J123 on the DC controller. 3) Defective engaging cam Action: Replace the developing rotary engaging unit. 4) Defective developing rotary engaging sensor Action: Replace the developing rotary engaging unit. 5) Defective engaging motor Action: Replace it. 6) Defective DC controller PCB Action: Replace it.
Code: E071
Display: E071
Description: ITB Home-Position Sensor Failure
Remedy: 1) Poor contact in the ITB home position sensor connector Action: Reconnect the J71 on the ITB home position detection PCB and J109 on the DC controller PCB. 2) Defective ITB home position sensor Action: Replace the ITB home position detection PCB. 3) Defective DC controller PCB Action: Replace it.
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.