Description: Short-circuited external temperature thermistor • The input voltage is 4.5 V or more.
Causes: Poor contact in the operation PWB connector terminals. Defective external temperature thermistor.
Remedy: Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable. Replace the operation PWB and check for correct operation.
Code: C7980
Description: Waste toner reservoir overflow problem (when the total number of copies is less than 100 thousand sheets) • After E31 is displayed, 1,000 sheets are copied. Or waste toner exceeds 5 g.
Causes: Defective waste toner sensor or engine PWB.
Remedy: Shake the process unit from side to side and turn the power switch off and then on. If the problem cannot be solved, replace the process unit. After replacing the process unit, turn the power switch off and then on. If the problem cannot be solved, replace the waste toner sensor or the engine PWB.
Code: C7990
Description: Waste toner reservoir overflow problem (when the total number of copies is 100 thousand sheets or more) • After E31 is displayed, 1,000 sheets are copied. Or waste toner exceeds 5 g.
Causes: Defective waste toner sensor or engine PWB.
Remedy: Shake the process unit from side to side and turn the power switch off and then on. If the problem cannot be solved, replace the process unit. After replacing the process unit, turn the power switch off and then on. If the problem cannot be solved, replace the waste toner sensor or the engine PWB.
Code: CF--
Description: Controller system error • After Call for Service person is indicated, the error can be cleared by turning the power switch off and then on.
Causes: Defective main PWB.
Remedy: If this error occurs again even after the power switch is turned off and then on again, replace the main PWB and check for correct operation.
Code: CF010
Description: ROM checksum error • After Call for Service person is indicated, the error can be cleared by turning the power switch off and then on.
Causes: Defective main PWB.
Remedy: If this error occurs again even after the power switch is turned off and then on again, contact the Service Administrative Division
Code: CF012
Description: ROM checksum error • After Call for Service person is indicated, the error can be cleared by turning the power switch off and then on.
Causes: Defective main PWB.
Remedy: If this error occurs again even after the power switch is turned off and then on again, contact the Service Administrative Division.