• Code: 7002
• Description: Toner motor C error
  When the toner motor C is driven, error signal is detected continuously for 1 s.
• Causes: Defective connector cable or poor contact in the connector.
  Defective drive transmission system.
  Defective motor.
  Defective 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(YC8)
  Defective drive transmission system. Check if the rollers and gears rotate smoothly. If not, grease the bushings and gears. Check for broken gears and replace if any.
  Defective motor. Replace the toner motor C.
  Defective PWB. Replace the engine PWB check for correct operation.

• Code: 7003
• Description: Toner motor M error
  When the toner motor M is driven, error signal is detected continuously for 1 s.
• Causes: Defective connector cable or poor contact in the connector.
  Defective drive transmission system.
  Defective motor.
  Defective 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(YC8)
  Defective drive transmission system. Check if the rollers and gears rotate smoothly. If not, grease the bushings and gears. Check for broken gears and replace if any.
  Defective motor. Replace the toner motor M.
  Defective PWB. Replace the engine PWB check for correct operation.

• Code: 7004
• Description: Toner motor Y error
  When the toner motor Y is driven, error signal is detected continuously for 1 s.
• Causes: Defective connector cable or poor contact in the connector.
  Defective drive transmission system.
  Defective motor.
  Defective 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(YC8)
  Defective drive transmission system. Check if the rollers and gears rotate smoothly. If not, grease the bushings and gears. Check for broken gears and replace if any.
  Defective motor. Replace the toner motor Y.
  Defective PWB. Replace the engine PWB check for correct operation.

• Code: 7101
• Description: Toner sensor K error
• Causes: Defective Developer unit.
  Defective PWB.
• Remedy: Defective Developer unit. Replace the developer unit K.
  Defective PWB. Replace the engine PWB check for correct operation.

• Code: 7102
• Description: Toner sensor C error
• Causes: Defective Developer unit.
  Defective PWB.
• Remedy: Defective Developer unit. Replace the developer unit C.
  Defective PWB. Replace the engine PWB check for correct operation.

• Code: 7103
• Description: Toner sensor M error
• Causes: Defective Developer unit.
  Defective PWB.
• Remedy: Defective Developer unit. Replace the developer unit M.
  Defective PWB. Replace the engine PWB check for correct operation.

• Code: 7104
• Description: Toner sensor Y error
• Causes: Defective Developer unit.
  Defective PWB.
• Remedy: Defective Developer unit. Replace the developer unit Y.
  Defective PWB. Replace the engine PWB check for correct operation.

• Code: 7401
• Description: Developing unit K type mismatch problem
  Absence of the developing unit K is detected.
• Causes: Developing unit connector inserted incorrectly.
  Different type of the developing unit is installed.
  Defective PWB.
• Remedy: Developing unit connector inserted incorrectly. Reinsert the developing unit connector if necessary.
  Different type of the developing unit is installed. Install the correct developing unit.
  Defective PWB. Replace the engine PWB check for correct operation.