• Code: 7904
• Description: Drum Y EEPROM error
  No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated five times successively. Mismatch of reading data from two locations occurs eight times successively. Mismatch between writing data and reading data occurs eight times successively.
• Causes: Poor contact in the connector terminals. Defective drum PWB.
• Remedy: Poor contact in the connector terminals. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Drum unit (Y) and drum connect PWB(YC2) drum connect PWB and engine connect PWB (YC4) Engine connect PWB and engine PWB (YC9)
  Defective drum PWB. Replace the drum unit Y.

• Code: 7911
• Description: Developing unit K EEPROM error
  No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated five times successively. Mismatch of reading data from two locations occurs eight times successively. Mismatch between writing data and reading data occurs eight times successively.
• Causes: Poor contact in the connector terminals. Defective developing PWB.
• Remedy: Poor contact in the connector terminals. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit (K) and drum connect PWB(YC9) drum connect PWB and engine connect PWB (YC4) Engine connect PWB and engine PWB (YC12)
  Defective developing PWB. Replace the developer unit K.

• Code: 7912
• Description: Developing unit C EEPROM error
  No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated five times successively. Mismatch of reading data from two locations occurs eight times successively. Mismatch between writing data and reading data occurs eight times successively.
• Causes: Poor contact in the connector terminals. Defective developing PWB.
• Remedy: Poor contact in the connector terminals. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit (C) and drum connect PWB(YC7) drum connect PWB and engine connect PWB (YC4) Engine connect PWB and engine PWB (YC12)
  Defective developing PWB. Replace the developer unit C.

• Code: 7913
• Description: Developing unit M EEPROM error
  No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated five times successively. Mismatch of reading data from two locations occurs eight times successively. Mismatch between writing data and reading data occurs eight times successively.
• Causes: Poor contact in the connector terminals. Defective developing PWB.
• Remedy: Poor contact in the connector terminals. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit (M) and drum connect PWB(YC8) drum connect PWB and engine connect PWB (YC4) Engine connect PWB and engine PWB (YC12)
  Defective developing PWB. Replace the developer unit M.

• Code: 7914
• Description: Developing unit Y EEPROM error
  No response is issued from the device in reading/writing for 5 ms or more and this problem is repeated five times successively. Mismatch of reading data from two locations occurs eight times successively. Mismatch between writing data and reading data occurs eight times successively.
• Causes: Poor contact in the connector terminals. Defective developing PWB.
• Remedy: Poor contact in the connector terminals. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Developer unit (Y) and drum connect PWB(YC6) drum connect PWB and engine connect PWB (YC4) Engine connect PWB and engine PWB (YC12)
  Defective developing PWB. Replace the developer unit Y.

• Code: 8030
• Description: Tray upper limit detection problem (document finisher)
  When the tray elevation motor raises a tray, the ON status of the tray upper limit sensor is detected.
• Causes: Defective connector cable or poor contact in the connector. Defective tray upper limit sensor, paper surface sensor 1/2. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Tray upper limit sensor and DF main PWB (CN5) Paper surface sensor 1/2 and DF main PWB (CN6)
  Defective tray upper limit sensor, paper surface sensor 1/2. Replace the sensor.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8040
• Description: Belt problem (document finisher)
  The belt sensor does not turn on/off within specified time of the belt solenoid turning on.
• Causes: Defective connector cable or poor contact in the connector. Defective belt sensor. Defective belt solenoid. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Belt sensor and DF main PWB (CN10) Belt solenoid and DF main PWB (CN21)
  Defective belt sensor. Replace the belt sensor.
  Defective belt solenoid. Replace the belt solenoid.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.

• Code: 8140
• Description: Tray elevation motor problem (document finisher)
  The tray low limit sensor or paper surface sensor 1/2 cannot be detected to be on within 10 s since the tray elevation motor is activated.
• Causes: Defective connector cable or poor contact in the connector. Defective connector cable or poor contact in the connector. The tray elevation motor malfunctions. Defective tray lower limit sensor, paper surface sensor 1/2. Defective DF main PWB.
• Remedy: Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Tray elevation motor and DF main PWB (CN12)
  Defective connector cable or poor contact in the connector. Reinsert the connector. Also check for continuity within the connector cable. If none, replace the cable. Tray lower limit sensor, and DF main PWB (CN5) Paper surface sensor 1/2 and DF main PWB (CN6)
  The tray elevation motor malfunctions. Replace the tray elevation motor.
  Defective tray lower limit sensor, paper surface sensor 1/2. Replace the sensor.
  Defective DF main PWB. Replace the DF main PWB and check for correct operation.