• Code: E7-05
• Description: CCD black level trouble
  CCD black level which is read while the copy lamp is off is abnormal.
• Causes: Flat cable installation failure CCD unit abnormality MCU PWB abnormality

• Code: F1-06
• Description: Shifter motor trouble
  The home position is not detected within 1 sec after shifter motor drive.
• Causes: The shifter home position sensor is defective. The shifter motor is defective. The shifter motor periphery circuit is defective. The condition of the MCU PWB JP4 is wrong. The assembly of the shifter motor unit is improper.

• Code: F2-04
• Description: CRUM data read trouble
  Communication error between CRUM PWB and MCU PWB
• Causes: CRUM PWB data error MCU PWB error MCU PWB EEPROM error Disconnection between CRUM (toner cartridge) and MCU PWB

• Code: F5-02
• Description: Copy lamp error
  Copy lamp voltage detection error
• Causes: Power unit trouble Copy lamp trouble Inverter trouble MCU PWB trouble

• Code: F9-00
• Description: Communication trouble between MCU and printer PWB (MCU detection)
  Communication establishment error, framing error, parity error, protocol error
• Causes: Bad connection of printer PWB connector Defective harness between printer PWB and MCU PWB. Motherboard connector pin breakage Printer PWB ROM error, data error

• Code: F9-10
• Description: Printer PWB trouble
  Communication trouble between MCU and printer PWB
• Causes: Bad connection of printer PWB connector Defective harness between printer PWB and MCU PWB. Motherboard connector pin breakage Printer PWB ROM error, data error

• Code: F9-80
• Description: Printer PWB communication trouble (Protocol)
  Communication trouble between MCU and printer PWB (Protocol error)
• Causes: Bad connection of printer PWB connector Defective harness between printer PWB and MCU PWB. Motherboard connector pin breakage Printer PWB ROM error, data error

• Code: F9-81
• Description: Printer PWB communication trouble (Parity)
  Communication trouble between MCU and printer PWB (Parity error)
• Causes: Printer PWB connector disconnection Printer PWB MCU PWB harness failure Printer PWB mother board connector pin breakage. Printer PWB ROM defect, data failure