• Code: 4201
• Display: Replace Drum:BK
• Description: Number of the drum unit (Black) rotations has reached the upper limit. (Printing is not stopped.)
• Causes: 1 Main PCB failure if the error code remains after replacing with a new drum unit and resetting the drum counter

• Code: 4202
• Display: Replace Drum:Y
• Description: Number of the drum unit (Yellow) rotations has reached the upper limit. (Printing is not stopped.)
• Causes: 1 Main PCB failure if the error code remains after replacing with a new drum unit and resetting the drum counter

• Code: 4203
• Display: Replace Drum:M
• Description: Number of the drum unit (Magenta) rotations has reached the upper limit. (Printing is not stopped.)
• Causes: 1 Main PCB failure if the error code remains after replacing with a new drum unit and resetting the drum counter

• Code: 4204
• Display: Replace Drum:C
• Description: Number of the drum unit (Cyan) rotations has reached the upper limit. (Printing is not stopped.)
• Causes: 1 Main PCB failure if the error code remains after replacing with a new drum unit and resetting the drum counter

• Code: 4300
• Display: Replace Parts Belt Unit
• Description: The belt unit will reach the end of life soon. (90%)
• Causes: 1 Main PCB failure if the error code remains after replacing with a new belt unit and resetting the belt counter

• Code: 4400
• Display: Replace Parts Belt Unit
• Description: Number of pages printed with the belt unit has reached the upper limit. (Printing is not stopped.)
• Causes: 1 Main PCB failure if the error code remains after replacing with a new belt unit and resetting the belt counter

• Code: 4500
• Display: Replace Parts Fuser Unit
• Description: Printable pages set for the fuser unit has reached the upper limit. (Printing is not stopped.)
• Causes: 1 Main PCB failure if the error code remains after replacing with a new fuser unit and resetting the fuser unit counter

• Code: 4700
• Display: Replace Parts WT Box End Soon
• Description: The waste toner sensor detected that the waste toner box is almost full.
• Causes: 1 Dirt on the contact of waste toner sensor in high-voltage power supply PCB 2 High-voltage power supply PCB failure 3 Main PCB failure