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.  |