• Code: C4
• Description: Option sorter SO-60 communication 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-777/KP-858). • Defective option sorter SO-60.

• Code: C7
• Description: Option bulk paper stacker HS-8E communication error
  Communication error between engine board and option bulk paper stacker HS-8E.
• 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 bulk paper stackers. • Defective harness (S02400) between engine board and option unit interface connector. • Improper connector insertion. • Defective option bulk paper stacker.

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

• Code: E0
• Description: Communication erroron error
  Communication between the engine board and the main board is failed.
• Causes: • Defective gate array (U02) on the main board. • Connector failure between the engine board (KP-864) and main board (KP-777/KP- 858). • Overrun in the engine system, deactivating the program flash ROM (U202) on the engine board (KP-864).

• Code: E1
• 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: E2
• Description: Laser scanner unit (Polygon motor) error
  POLRDY does not go low within 20 seconds after POLON* goes low (When starting) or within 16 seconds after REGPAP signal goes high (during printing).
• Causes: • Defective gate array U204 on the engine board. • Defective polygon motor. • Improper connector insertion. • Defective harness between laser scanner unit and engine board.

• Code: E3
• Description: Laser scanner unit (Pin photo diode sensor) error
  Laser beam detection failed. The pin photo diode sensor [board] (KP-746) does not deliver a horizontal synchronous signal (PD).
• Causes: • No laser beam due to the laser diode defect (PD). • Soiled or defective pin photo diode sensor. • Defective gate array U204 of engine board. • Improper connector insertion. • Defective harness between engine board and laser scanner unit.