• Code: 20
• Description: Laser diode failure (K)
• Causes: 1 Laser unit harness connection failure. 2 Laser unit failure. 3 Engine PCB failure
• Remedy: 1 Laser unit harness connection failure Check the two harness connections of the laser unit and reconnect them. 2 Laser unit failure Replace the laser unit. 3 Engine PCB failure Replace the engine PCB ASSY.

• Code: 21
• Description: Laser diode failure (Y)
• Causes: 1 Laser unit harness connection failure. 2 Laser unit failure. 3 Engine PCB failure
• Remedy: 1 Laser unit harness connection failure Check the two harness connections of the laser unit and reconnect them. 2 Laser unit failure Replace the laser unit. 3 Engine PCB failure Replace the engine PCB ASSY.

• Code: 22
• Description: Laser diode failure (M)
• Causes: 1 Laser unit harness connection failure. 2 Laser unit failure. 3 Engine PCB failure
• Remedy: 1 Laser unit harness connection failure Check the two harness connections of the laser unit and reconnect them. 2 Laser unit failure Replace the laser unit. 3 Engine PCB failure Replace the engine PCB ASSY.

• Code: 23
• Description: Laser diode failure (C)
• Causes: 1 Laser unit harness connection failure. 2 Laser unit failure. 3 Engine PCB failure
• Remedy: 1 Laser unit harness connection failure Check the two harness connections of the laser unit and reconnect them. 2 Laser unit failure Replace the laser unit. 3 Engine PCB failure Replace the engine PCB ASSY.

• Code: 25
• Description: Develop drive motor failure
• Causes: 1 Motor harness connection failure. 2 Motor failure. 3 Engine PCB failure. 4 Low-voltage power supply PCB failure.
• Remedy: 1 Motor harness connection failure Check the harness connection of the appropriate motor and reconnect it. 2 Motor failure Replace the appropriate motor. 3 Engine PCB failure Replace the engine PCB ASSY. 4 Low-voltage power supply PCB failure Replace the PS PCB unit.

• Code: 26
• Description: Belt drive motor failure
• Causes: 1 Motor harness connection failure. 2 Motor failure. 3 Engine PCB failure. 4 Low-voltage power supply PCB failure.
• Remedy: 1 Motor harness connection failure Check the harness connection of the appropriate motor and reconnect it. 2 Motor failure Replace the appropriate motor. 3 Engine PCB failure Replace the engine PCB ASSY. 4 Low-voltage power supply PCB failure Replace the PS PCB unit.

• Code: 27
• Description: Paper feed/belt cleaner motor failure
• Causes: 1 Motor harness connection failure. 2 Motor failure. 3 Engine PCB failure. 4 Low-voltage power supply PCB failure.
• Remedy: 1 Motor harness connection failure Check the harness connection of the appropriate motor and reconnect it. 2 Motor failure Replace the appropriate motor. 3 Engine PCB failure Replace the engine PCB ASSY. 4 Low-voltage power supply PCB failure Replace the PS PCB unit.

• Code: 28
• Description: Drum drive motor 1 (K, Y) failure
• Causes: 1 Drum drive motor harness connection failure. 2 Drum phase sensor PCB failure. 3 Drum drive motor failure. 4 Engine PCB failure.
• Remedy: 1 Drum drive motor harness connection failure Check the harness connection of the drum drive motor and reconnect it. 2 Drum phase sensor PCB failure Replace the drum phase sensor PCB ASSY. 3 Drum drive motor failure Replace the drum drive motor. 4 Engine PCB failure Replace the engine PCB ASSY.