• 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.
  Defective engine PWB
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC13 on the engine PWB and the continuity across the connector terminals. Repair or replace if necessary.
  Defective humidity sensor. Replace the humidity sensor.
  Defective engine PWB. Replace the engine PWB.

• Code: C8000
• Description: Fnisher type mismatch problem
  • Absence of the finisher is detected.
• Causes: Different type of the finisher is installed.
• Remedy: Install the correct finisher.

• Code: C8010
• Description: Document finisher paper conveying motor problem
  • The LOCK signal of the paper conveying motor is detected for more than 500 ms while the paper conveying motor is operating. However, the first 1 s after the paper conveying motor is turned on is excluded from detection.
• Causes: Loose connection of the paper conveying motor connector.
  Defective paper conveying motor.
  Defective finisher main PWB.
• Remedy: Loose connection of the paper conveying motor connector. Check the connection of connector YC14 on the finisher main PWB. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable.
  Defective paper conveying motor. Replace the paper conveying motor and check for correct operation.
  Defective finisher main PWB. Replace the finisher main PWB and check for correct operation

• Code: C8020
• Description: Document finisher punch motor problem
  • The LOCK signal of the punch motor is detected for more than 500 ms while the punch motor is operating. However, the first 1 s after the punch motor is turned on is excluded from detection.
• Causes: Loose connection of the punch motor connector.
  Defective punch motor.
  Defective finisher main PWB.
• Remedy: Loose connection of the punch motor connector. Check the connection of connector YC13 on the finisher main PWB and YC1 on the punch PWB. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable.
  Defective punch motor. Replace the punch motor and check for correct operation.
  Defective finisher main PWB. Replace the finisher main PWB and check for correct operation.

• Code: C8030
• Description: Document finisher upper paper conveying belt problem
  • During initialization, the intermediate tray upper sliding plate is not detected in the home position within 3 s after the belt returns to the home position. JAM87 is indicated the first time this problem occurs. If the problem reoccurs after initialization when the front cover is opened and closed, the problem is in the upper paper conveying belt. • When the intermediate tray upper sliding plate is operated from the home position, the upper paper conveying belt home position sensor does not turn off within 1 s.
• Causes: Phase shift of the upper paper conveying belt.
  Malfunction of the upper paper conveying belt motor.
  Malfunction of the upper paper conveying belt home position sensor.
  Loose connection of the upper paper conveying belt home position sensor connector.
  Incorrect insertion of the intermediate tray.
  Defective finisher main PWB
• Remedy: Phase shift of the upper paper conveying belt. Correct the phase of the upper paper conveying belt and check for correct operation.
  Malfunction of the upper paper conveying belt motor. Replace the upper paper conveying belt motor and check for correct operation.
  Malfunction of the upper paper conveying belt home position sensor. Replace the upper paper conveying belt home position sensor and check for correct operation.
  Loose connection of the upper paper conveying belt home position sensor connector. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable.
  Incorrect insertion of the intermediate tray. Check whether the intermediate tray catches are damaged.
  Defective finisher main PWB. Replace the finisher main PWB and check for correct operation.

• Code: C8040
• Description: Document finisher lower paper conveying belt problem
  • During initialization, the intermediate tray lower sliding plate is not detected in the home position within 3 s after the belt returns to the home position. JAM87 is indicated the first time this problem occurs. If the problem reoccurs after initialization when the front cover is opened and closed, the problem is in the lower paper conveying belt. • When the intermediate tray lower sliding plate is operated from the home position, the lower paper conveying belt home position sensor does not turn off within 1 s.
• Causes: Phase shift of the lower paper conveying belt.
  Malfunction of the lower paper conveying belt motor.
  Malfunction of the lower paper conveying belt home position sensor.
  Loose connection of the lower paper conveying belt home position sensor connector.
  Incorrect insertion of the intermediate tray.
  Defective finisher main PWB.
• Remedy: Phase shift of the lower paper conveying belt. Correct the phase of the lower paper conveying belt and check for correct operation.
  Malfunction of the lower paper conveying belt motor. Replace the lower paper conveying belt motor and check for correct operation.
  Malfunction of the lower paper conveying belt home position sensor. Replace the lower paper conveying belt home position sensor and check for correct operation.
  Loose connection of the lower paper conveying belt home position sensor connector. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable.
  Incorrect insertion of the intermediate tray. Check whether the intermediate tray catches are damaged.
  Defective finisher main PWB. Replace the finisher main PWB and check for correct operation.

• Code: C8140
• Description: Document finisher main tray problem
  • When the main tray is not detected by the main tray upper limit detection sensor or the main tray load detection sensor within 20 s from the moment it starts ascending.
  • During main tray descent, the main tray upper limit detection sensor or the main tray load detection sensor does not turn off within 500 ms after it turns on.
  • During main tray ascent, the main tray upper limit detection sensor or the main tray load detection sensor stays on for more than 2 s.
• Causes: Loose connection of the main tray elevation motor connector.
  Malfunction of the main tray elevation motor.
  Malfunction of the main tray upper limit detection sensor.
  Loose connection of the main tray upper limit detection sensor connector.
  Malfunction of the main tray load detection sensor.
  Loose connection of the main tray load detection sensor connector.
  Defective finisher main PWB.
• Remedy: Loose connection of the main tray elevation motor connector. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable.
  Malfunction of the main tray elevation motor. Replace the main tray elevation motor and check for correct operation.
  Malfunction of the main tray upper limit detection sensor. Replace the main tray upper limit detection sensor and check for correct operation.
  Loose connection of the main tray upper limit detection sensor connector. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable.
  Malfunction of the main tray load detection sensor. Replace the main tray load detection sensor and check for correct operation.
  Loose connection of the main tray load detection sensor connector. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable.
  Defective finisher main PWB. Replace the finisher main PWB and check for correct operation.

• Code: C8150
• Description: Document finisher multi job tray problem
  • When the multi job tray is not detected by the multi job tray upper limit detection sensor within 20 s from the moment it starts ascending.
  • During multi job tray descent, the multi job tray upper limit detection sensor does not turn off within 500 ms after it turns on.
• Causes: Loose connection of the multi job tray elevation motor connector.
  Malfunction of the multi job tray elevation motor.
  Malfunction of the multi job tray upper limit detection sensor.
  Loose connection of the multi job tray upper limit detection sensor connector.
  Defective finisher main PWB.
• Remedy: Loose connection of the multi job tray elevation motor connector. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable.
  Malfunction of the multi job tray elevation motor. Replace the multi job tray elevation motor and check for correct operation.
  Malfunction of the multi job tray upper limit detection sensor. Replace the multi job tray upper limit detection sensor and check for correct operation.
  Loose connection of the multi job tray upper limit detection sensor connector. Reinsert the connector. Also check for continuity within the connector cable. If none, remedy or replace the cable.
  Defective finisher main PWB. Replace the finisher main PWB and check for correct operation.