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.
Code: E4
Description: Fuser unit error
HTEMP remains high for longer than 4/2 seconds since the heater lamp is on. The heater lamp continues to be turn on for longer than 60/30 seconds.
Causes: • Blown-out thermistor. • Blown-out heater lamp. • Defective CPU U201 or comparator U205 on the engine board. • Improper connector insertion. • Defective power supply unit. • Defective harness between fuser unit and power supply unit.
Code: E5
Description: Eraser lamp error
The ERADEAD signal (delivered from the eraser lamp blownout detection circuit on the engine board) goes low continuously more than 1 second, while eraser lamp is on.
Causes: • Blown-out eraser lamp [board KP-762]. • Defective CPU U201 on the engine board. • Improper connector insertion to the eraser lamp [board KP-762].