• Code: A0
• Description: Zero cross signal error
  The ZCROSS signal does not reach the engine board within 3 seconds after power on.e
• Causes: • Defective power supply unit. • Defective CPU U201 on the engine board.

• Code: A2
• Description: Abnomal high temperature error.
  CPU U201 detected that the HTEMP* signal (Abnormal temperature of more than approximately 220 °C) is low for more than 3 seconds.
• Causes: • Defective CPU U201 or comparator U205 on the engine board. • Defective engine board (KP-864). • Defective thermistor. • Defective photo coupler on the power supply unit for the heater lamp.

• Code: B2
• 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: B3
• 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.

• Code: B4
• Description: Option paper feeder PF-60 (Bottom) paper feed motor error.
  Paper feed motor error in the bottom 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: C0
• 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: C1
• 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. PF-60.

• Code: C2
• 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.