• Code: L4-01
• Description: Main motor lock
  The main motor encoder pulse is not detected for 400msec.
• Causes: Main motor defect Harness disconnection between the MCU PWB and the main motor. Control circuit failure

• Code: L4-10
• Description: Job separator motor trouble
  When the home is not detected within 2.5 sec after the job separator tray starts to move upwards.
• Causes: The job separator upper limit detection sensor is defective. The job separator motor is defective. The job separator motor periphery circuit is defective. The condition of the MCU PWB JP5 is wrong.

• Code: L6-10
• Description: Polygon motor lock
  The lock signal (the specified rotation speed signal) is not supplied within the specified time (about 6 sec) after starting the polygon motor rotation.
• Causes: LSU connector disconnection or harness disconnection in the LSU.

• Code: L8-01
• Description: Zero cross pulse (FW) trouble
  Zero cross pulse width is shifted by 55Hz +-10% or more.
• Causes: MCU PWB defect Power supply unit breakdown

• Code: U2-04
• Description: EEPROM serial communication error
  Error in communication with EEPROM
• Causes: EEPROM failure Installation of uninitialized EEPROM MCU PWB EERPOM access circuit faiure

• Code: U2-11
• Description: Counter check sum error
  Counter check sum value stored in the EEPROM is abnormal.
• Causes: EEPROM failure Control circuit hung up by noises MCU PWB EEPROM access circuit defect

• Code: U2-12
• Description: Adjustment value check sum error (EEPROM)
  Adjustment value data area check sum error
• Causes: EEPROM failure Control circuit hung up by noises MCU PWB EEPROM access circuit failure

• Code: U2-40
• Description: CRUM communication error
  Toner cartridge CRUM data read error
• Causes: A toner cartridge of a different destination is installed. EEPROM trouble Check the destination setup. Toner cartridge CRUM PWB trouble MCU PWB trouble CRUM connector disconnection