• Code: E0
• Description: Communication error
  Communication between the engine controller and the main controller is failed.
• Causes: . Controller gate array defect . Connector failure between the engine and the main controller . Overrun in the engine system, deactivating the progam flash ROM

• Code: E1
• Description: Main motor error
  The main motor is overtorqued.
• Causes: . Overcurrent in the main motor circuitry due to an axcessive torque . Loose connector to motor . Defective gate array on the engine board . No response from the main motor due to the defective motor driver (transistor) . Defective overcurrent detector (transistor)

• Code: E2
• Description: Laser scanner motor error
  The polygon motor does not deliver a synchronous output (L) within the predetermined period of time.
• Causes: . Timeout in the predetermined period of lead time which the scanner motor speed has to be reached at start up (SCRDY*) . Connector insertion error . Defective gate array on the engine board . Time out dur to the defective scanner motor driver (transistor)

• Code: E3
• Description: Laser beam detection error
  Beam detection is failed. The photo detector board does not deliver a synchronous output (L).
• Causes: . No beam hit due to the laser diode defect (PD*) . Improper connector insertion . Soiled/defective beam detector (pin-photo diode) sensor . Defective safety lock . Unoperative gate array input portf

• Code: E4
• Description: Fuser heater error
  The fuser heater is not intact due to disconnection or the circuit failure.
• Causes: . Blown-out thermistor . Improper connector insertion . Blown-out halogen heater . Blown-out thermostat . Comparator defect on the engine board . Defective engine CPU (input port) . Defective gate array (input/output port operation)

• Code: E5
• Description: Eraser error
  The eraser is blown out or the power supply does not reach to the eraser.
• Causes: . Blown-out LED chip(s) . Connector insertion error . Defective gate array (input/output port)

• Code: E9
• Description: Toner motor error
  The toner motor is overtorqued.ash ROM
• Causes: . Overcurrent in the toner motor circuitry due to an axcessive torque . Loose connector . Defective gate array on the engine board . Defective toner motor overcurrent detector

• Code: ED
• Description: Flash ROM error
  Checksum is erroneous with the flash ROM.
• Causes: . Data readout error on the flash ROM