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.
Code: L1-00
Description: Feeding is not completed within the specified time after starting feeding. (The scan head locking switch is locked)
Causes: The white area and the black marking on the shading plate are used to obtain the difference in the CCD level values for judgment of lock. When the difference in the levels of which and black is small, it is judged that the black mark could not be scanned by lock and the trouble code “L1” is displayed. - The scan head is locked by the lock switch. - Mirror unit abnormality - The scanner wire is disconnected. - The origin detection sensor abnormality - Mirror motor harness abnormality
Remedy: Check to confirm that the scan head lock switch is released. Use TC 1-1 to check the mirror reciprocating operations. When the mirror does not feed. Check for disconnection of the scanner wire. Check the harness and the connector between the mirror motor and the MCU PWB. Replace the mirror unit. Replace the MCU PWB. When the mirror does feed. Use TC 1-2 to check the mirror home position sensor.
Code: L3-00
Description: Scanner return trouble
Causes: When the mirror base is returned for the specified time (6 sec) in mirror initializing after turning on the power, the mirror home position sensor (MHPS) does not turn ON. Or when the mirror base is returned for the specified time (about 6 sec) after start of copy return, the mirror home position sensor (MHPS) does not turn ON. - Mirror unit abnormality - Scanner wire disconnection - Origin detection sensor abnormality - Mirror motor harness abnormality
Remedy: Use TC 1-1 to check the mirror reciprocating operations. When the mirror does not return. Check for disconnection of the scanner wire. Check the harness and the connector between the mirror motor and the MCU PWB. Replace the mirror unit. Replace the MCU PWB. When the mirror does feed. Use TC 1-2 to check the mirror home position sensor.