• Code: 6950
• Description: Fuser IH PWB communication error
  No response is received in 30 ms since a command is sent to IHCPU. A checksum error is detected 10 times in succession.
• Causes: Defective connector cable or poor contact in the connector. Defective fuser IH PWB. Defective engine 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. Fuser IH PWB (YC4) and engine PWB (YC26)
  Defective fuser IH PWB. Replace the fuser IH PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 6960
• Description: Current PWB error
  Less than 1A is continuously observed for 5 s.
• Causes: Defective current PWB.
• Remedy: Defective current PWB. Replace the current PWB and check for correct operation.

• Code: 6990
• Description: Fuser power supply incompatibility
  Information won’t match between the engine backup and the fuser IH PWB.
• Causes: Differences in settings after initialization. Defective fuser IH PWB. Defective engine PWB. Data damage of EEPROM.
• Remedy: Differences in settings after initialization When this has happened after initialization using U201, make settings identical with the voltages on the IH PWB using U169.
  Defective fuser IH PWB. Replace the fuser IH PWB and check for correct operation.
  Defective engine PWB. Replace the engine PWB and check for correct operation.
  Data damage of EEPROM. Contact the Service Administrative Division.

• Code: 7001
• Description: Toner motor K error
  When the toner motor K is driven, the pulse sensor is not detected for 15 times in 200 ms intervals has occurred in 15 times. During the toner motor is driven, an event in which TMOT_LOCK turns to H (locked) 5 times has occurred in 15 sets.
• Causes: Defective connector cable or poor contact in the connector. Defective screw sensor K. Defective toner motor K. Defective engine 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. Toner motor K and engine PWB (YC27)
  Defective screw sensor K. Replace the screw sensor K.
  Defective toner motor K. Replace the toner motor K.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7002
• Description: Toner motor C error
  When the toner motor K is driven, the pulse sensor is not detected for 15 times in 200 ms intervals has occurred in 15 times. During the toner motor is driven, an event in which TMOT_LOCK turns to H (locked) 5 times has occurred in 15 sets.
• Causes: Defective connector cable or poor contact in the connector. Defective screw sensor C. Defective toner motor C. Defective engine 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. Toner motor C and engine PWB (YC27)
  Defective screw sensor C. Replace the screw sensor C.
  Defective toner motor C. Replace the toner motor C.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7003
• Description: Toner motor M error
  When the toner motor K is driven, the pulse sensor is not detected for 15 times in 200 ms intervals has occurred in 15 times. During the toner motor is driven, an event in which TMOT_LOCK turns to H (locked) 5 times has occurred in 15 sets.
• Causes: Defective connector cable or poor contact in the connector. Defective screw sensor M. Defective toner motor M. Defective engine 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. Toner motor M and engine PWB (YC27)
  Defective screw sensor M. Replace the screw sensor M.
  Defective toner motor M. Replace the toner motor M.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7004
• Description: Toner motor Y error
  When the toner motor K is driven, the pulse sensor is not detected for 15 times in 200 ms intervals has occurred in 15 times. During the toner motor is driven, an event in which TMOT_LOCK turns to H (locked) 5 times has occurred in 15 sets.
• Causes: Defective connector cable or poor contact in the connector. Defective screw sensor Y. Defective toner motor Y. Defective engine 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. Toner motor Y and engine PWB (YC27)
  Defective screw sensor Y. Replace the screw sensor Y.
  Defective toner motor Y. Replace the toner motor Y.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: 7101
• Description: Toner sensor K error
  Sensor output value of 60 or less or 944 or more continued for 3 s.
• Causes: Defective connector cable or poor contact in the connector. Defective toner sensor K. Failure of locking the developer waste slot at setup. Defective engine 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. Toner sensor K and front PWB (YC9) Front PWB (YC2) and engine PWB (YC10)
  Defective toner sensor K. Replace developer unit K.
  Failure of locking the developer waste slot at setup. Check whether the developer waste slot has been unlocked and unlock if necessary.
  Defective engine PWB. Replace the engine PWB and check for correct operation.