Symptom  | Possible cause  | Necessary actions  | 
|---|---|---|
Images are skewed  | Incorrect installation of paper  | Install the paper correctly.  | 
Incorrect paper guide position  | Adjust the paper guide correctly. 
  | |
Defective registration roller  | Repair the paper feed unit.  | |
Incorrect action of paper transfer roller  | Check the paper transfer roller.  | |
Defective BiCU  | Replace the BiCU.  | |
Incorrect installation of paper tray  | Uninstall the paper tray units and re-install them.  |