• Code: E7-10
• Description: Shading trouble (Black correction)
• Causes: The CCD black scan level is abnormal when the shading.
  - Improper connection of the CCD unit flat cable CCD unit abnormality
  - MCU PWB abnormality
• Remedy: Check connection of the CCD unit flat cable. Check the CCD unit.

• Code: E7-11
• Description: Shading trouble (White correction)
• Causes: The CCD white scan level is abnormal when the shading.
  - Improper connection of the CCD unit flat cable Dirt on the mirror, the lens, and the reference white plate
  - Copy lamp lighting abnormality CCD unit abnormality
  - MCU PWB abnormality (When occurred in the ADF scan position.)
  - Improper installation of the mirror unit
• Remedy: Clean the mirror, lens, and the reference white plate. Check the light quantity and lighting status of the copy lamp (TC 05-03). Check the MCU PWB.

• Code: E7-16
• Description: Abnormal laser output
• Causes: When the laser output is stopped, HSYNC is detected.
  - Laser abnormality MCU PWB abnormality.
• Remedy: Check the laser emitting diode operation. Replace the MCU PWB.

• Code: F5-02
• Description: Copy lamp lighting abnormality
• Causes: The copy lamp does not turn on.
  - Copy lamp abnormality
  - Copy lamp harness abnormality
  - CCD PWB harness abnormality.
• Remedy: Use TC 5-3 to check the copy lamp operations. When the copy lamp lights up. Check the harness and the connector between the CCD unit and the MCU PWB. When the copy lamp does not light up. Check the harness and the connector between the copy lamp unit and the MCU PWB. Replace the copy lamp unit. Replace the MCU PWB.

• Code: F6-10
• Description: FAX board trouble
• Causes: Communication trouble between MCU and FAX control PWB
  - FAX control PWB connector disconnection
  - Defective harness between FAX control PWB and MCU PWB
  - Motherboard connector pin breakage
  - FAX control PWB ROM error/Data error
  - IC on FAX PWB causes abnormality
• Remedy: Check connector/harness of FAX control PWB and MCU PWB. Check the grounding of the copier. Check FAX control PWB ROM. Replace the FAX PWB.

• Code: H2-00
• Description: Thermistor open
• Causes: The thermistor is open.
  The fusing unit is not installed.
  - Thermistor abnormality
  - Control PWB abnormality
  - Fusing section connector disconnection
  - The fusing unit is not installed.
• Remedy: Check the harness and the connector between the thermistor and the PWB. Use TC 14 to clear the self diagnostic display.

• Code: H3-00
• Description: Heat roller high temperature detection
• Causes: The fusing temperature exceeds 240°C.
  - Thermistor abnormality
  - Control PWB abnormality
  - Fusing section connector disconnection.
• Remedy: Use TC 5-02 to check the heater lamp blinking operation. When the lamp blinks normally. Check the thermistor and its harness. Check the thermistor input circuit on the control PWB. When the lamp keeps ON. Check the power PWB and the lamp control circuit on the MCU PWB. Use TC 14 to clear the self diagnostic display.

• Code: H4-00
• Description: Heat roller low temperature detection
• Causes: The fusing temperature does not reach 185°C within 27 sec of turning on the power, or the fusing temperature keeps at 140°C.
  - Thermistor abnormality
  - Heater lamp abnormality
  - Thermostat abnormality
  - Control PWB abnormality
• Remedy: Use TC 5-02 to check the heater lamp blinking operation. When the lamp blinks normally. Check the thermistor and its harness. Check the thermistor input circuit on the control PWB. When the lamp does not light up. Check for disconnection of the heater lamp and the thermostat. Check the interlock switch. Check the power PWB and the lamp control circuit on the MCU PWB. Use TC 14 to clear the self diagnostic display.