Symptom

Possible cause

Necessary actions

Printed images are too weak.

Loose connection between paper transfer roller and HVPS

Check the connection between the paper transfer roller and the HVPS.

Dust in the laser beam path

Clean the laser beam path.

Image transfer belt not contacting PCDU

Check the image transfer belt unit.

Defective PCDU

Replace the PCDU.

Defective paper transfer roller

Repair the paper transfer roller.

Defective fusing unit

Replace the fusing unit.

Defective BiCU

Replace the BiCU.