• Code: 0420
• Description: Option paper feeder PF-60 communication error
  Communication error between engine board and option paper feeder PF-60.
• Causes: Defective gate array U204 on the engine board (KP-864). Blown-out fuse (F202) on the engine board. Improper installation between printer and option paper feeder. Defective harness (S02400) between engine board and option unit interface connector. Improper connector insertion. Defective option paper feeder PF-60.

• Code: 0440
• Description: Option sorter SO-60 communication error error
  Communication error between engine board and option sorter SO-60.
• Causes: Defective gate array U204 on the engine board (KP-864). Blown-out fuse (F202) on the engine board. Improper installation between printer and option sorters. Improper connector insertion. Defective main board (KP-948). Defective option sorter SO-60.

• Code: 0460
• Description: Option duplexer DU-60 communication error
  Communication error between engine board and option duplexer DU-60.
• Causes: Defective gate array U204 on the engine board (KP-864). Blown-out fuse (F202) on the engine board. Improper installation between printer and option duplexers. Defective harness (S02400) between engine board and option unit interface connector. Improper connector insertion. Defective option duplexer DU-60.

• Code: 1210
• Description: Option duplexer DU-60 side registration error
  Side registration home position error of option duplexer DU-60.
• Causes: Defective gate array U204 on the engine board (KP-864). Improper installation between printer and option duplexer, or each option unit. Defective harness (S02400) between engine board and option unit interface connector. Improper connector insertion. Defective option duplexer DU-60.

• Code: 2000
• Description: Main motor error
  The main motor is overloaded.
• Causes: Overcurrent in the main motor circuitry due to an excessive torque. Connector insertion error. Defective gate array U204 on the engine board (KP-864). Defective harness between engine board and engine relay board (KP-760). Defective harness between engine relay board (KP-760) and main motor.

• Code: 2600
• Description: Option bulk paper feeder PF-8E motor error
  Motor error in the option bulk paper feeder PF-8E.
• Causes: Defective harness (S02400) between engine board and option unit interface connector. Defective option bulk paper feeder.

• Code: 2610
• Description: Option paper feeder PF-60 (Top) paper feed motor error
  Paper feed motor error in the top option paper feeder.
• Causes: Defective gate array U204 on the engine board (KP-864). Defective harness (S02400) between engine board and option unit interface connector. Defective paper feeder PF-60.

• Code: 2620
• Description: Option paper feeder PF-60 (Middle) paper feed motor error
  Paper feed motor error in the middle option paper feeder.
• Causes: Defective gate array U204 on the engine board (KP-864). Defective harness (S02400) between engine board and option unit interface connector. Defective option paper feeder PF-60.