Code :

Code: C7800
Description: Broken external temperature thermistor • The input voltage is 0.5 V or less.
Causes: Poor contact in the operation board 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 board and check for correct operation.

Code: C7810
Description: Short-circuited external temperature thermistor • The input voltage is 4.5 V or more.
Causes: Poor contact in the operation board 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 board 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 board (KP- 5238).
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 board (KP- 5238).

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 board (KP- 5238).
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 board (KP- 5238).

Code: CF
Description: Controller system error • After “Call for Servece person” is indicated, the error can be cleared by turning the power switch off and then on.
Causes: Defective main board (KP-5191).
Remedy: If this error occurs again even after the power switch is turned off and then on again, replace the main board (KP-5191) and check for correct operation.

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