Code :

Code: C7810
Description: Short-circuited external thermistor The thermistor input value is 0.5 V or less.
Causes: Poor contact in the connector terminals. Defective humidity sensor.
Remedy: Poor contact in the connector terminals. Check the connection of connector YC14 on the engine PWB and the continuity across the connector terminals. Repair or replace if necessary. Defective humidity sensor. Replace the humidity sensor.

Code: C7900
Description: Drum EEPROM error Reading from or writing to EEPROM cannot be performed.
Causes: Poor contact in the connector terminals. Defective drum unit.
Remedy: Poor contact in the connector terminals. Check the connection of connector on the engine PWB and the continuity across the connector terminals. Repair or replace if necessary. Defective drum unit. Replace the drum unit.

Code: C7910
Description: Developing unit EEPROM error Reading from or writing to EEPROM cannot be performed.
Causes: Poor contact in the connector terminals. Defective developing unit.
Remedy: Poor contact in the connector terminals. Check the connection of connector on the engine PWB and the continuity across the connector terminals. Repair or replace if necessary. Defective developing unit. Replace the developing unit.

Code: C8020
Description: Punch motor problem (optional 3000sheet document finisher) The LOCK signal of the punch motor is detected for more than 500 ms while the punch motor is operating.
Causes: Poor contact in the connector terminals. Defective punch motor. Defective PWB.
Remedy: Poor contact in the connector terminals. Check the connection of connector on the punch PWB and the continuity across the connector terminals. Repair or replace if necessary. Defective punch motor. Replace the punch motor. Defective PWB. Replace the punch PWB or finisher main PWB and check for correct operation.

Code: C8030
Description: Tray upper limit detection problem (optional document finisher) When the tray elevation motor raises a tray, the ON status of the tray upper limit sensor is detected.
Causes: The tray upper limit sensor/push paper sensor/surface view sensor connector makes poor contact. Defective tray upper limit sensor/ push paper sensor/ surface view sensor. Defective finisher main PWB.
Remedy: The tray upper limit sensor/push paper sensor/surface view sensor connector makes poor contact. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable. Defective tray upper limit sensor/ push paper sensor/ surface view sensor. Replace the sensor. Defective finisher main PWB. Replace the finisher main PWB and check for correct operation.

Code: C8050
Description: Paper conveying belt motor 1 problem (optional 3000-sheet document finisher) Paper conveying belt home position sensor 1 does not turn off within 1.5 s. Paper conveying belt home position sensor 1 does not turn on within 2.5 s. Jam 88 is indicated.
Causes: Poor contact in the connector terminals. Defective paper conveying belt home position sensor 1. Defective paper conveying belt motor 1. Defective PWB.
Remedy: Poor contact in the connector terminals. Check the connection of connector YC2 on the internal tray PWB and the connector on paper conveying belt motor 1, and the continuity across the connector terminals. Repair or replace if necessary. Defective paper conveying belt home position sensor 1. Replace paper conveying belt home position sensor 1. Defective paper conveying belt motor 1. Replace paper conveying belt motor 1. Defective PWB. Replace the internal tray PWB or finisher main PWB and check for correct operation.

Code: C8060
Description: Paper conveying belt motor 2 problem (optional 3000-sheet document finisher) Paper conveying belt home position sensor 2 does not turn off within 1.5 s. Paper conveying belt home position sensor 2 does not turn on within 2.5 s.
Causes: Poor contact in the connector terminals. Defective paper conveying belt home position sensor 2. Defective paper conveying belt motor 2. Defective PWB.
Remedy: Poor contact in the connector terminals. Check the connection of connector YC6 on the internal tray PWB and the connector on paper conveying belt motor 2, and the continuity across the connector terminals. Repair or replace if necessary. Defective paper conveying belt home position sensor 2. Replace paper conveying belt home position sensor 2. Defective paper conveying belt motor 2. Replace paper conveying belt motor 2. Defective PWB. Replace the internal tray PWB or finisher main PWB and check for correct operation.

Code: C8070
Description: Internal tray communication error (optional 3000-sheet document finisher) Communication with the internal tray is not possible although the connection is detected.
Causes: Poor contact in the connector terminals. Defective PWB.
Remedy: Poor contact in the connector terminals. Check the connection of connector YC6 on the finisher main PWB and the connector YC1 on the internal tray PWB, and the continuity across the connector terminals. Repair or replace if necessary. Defective PWB. Replace the internal tray PWB or finisher main PWB and check for correct operation.