• Code: C7000
• Description: Toner motor problem
  After driving of the toner motor starts, the error signal is not at the H level for 500 ms continuously.
• Causes: Poor contact in the connector terminals.
  Broken the gear
  Defective toner motor M/C/Y/K.
  Defective engine PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC26 on the engine PWB and the connector of the toner motor, and the continuity across the connector terminals. Repair or replace if necessary.
  Broken the gear. Check visually and replace the gear if necessary.
  Defective toner motor M/C/Y/K. Run maintenance item U135 and check if the toner motor operates. If not, replace the toner motor.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: C7100
• Description: Toner container motor error
  The rated speed achievement signal does not turn to L within 2 s since toner container motor is activated. The rated speed achievement signal is at the H level for 1 s continuously after toner container motor is stabilized.
• Causes: Poor contact in the connector terminals.
  Defective drive transmission system.
  Defective toner container motor
  Defective engine PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC26 on the engine PWB and the connector on the toner container motor, and the continuity across the connector terminals. Repair or replace if necessary.
  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 toner container motor. Run maintenance item U030 and check if the toner container motor operates when YC26-A7 (remote signal) on the engine PWB goes low. If not, replace the toner container motor.
  Defective engine PWB. Run maintenance item U030 and check if YC26-A7 (remote signal) on the engine PWB goes low. If not, replace the engine PWB.

• Code: C7101
• Description: Toner sensor K problem
  Sensor output value of 60 or less or 944 or more continued for 3 s.
• Causes: Defective developing unit K.
  Defective PWB.
• Remedy: Defective developing unit K. Replace the developing unit K.
  Defective PWB. Replace the main front PWB or engine PWB and check for correct operation.

• Code: C7102
• Description: Toner sensor C problem Sensor output value of 60 or less or 944 or more continued for 3 s.
• Causes: Defective developing unit C.
  Defective PWB.
• Remedy: Defective developing unit C. Replace the developing unit C.
  Defective PWB. Replace the sub front PWB or engine PWB and check for correct operation.

• Code: C7103
• Description: Toner sensor M problem Sensor output value of 60 or less or 944 or more continued for 3 s.
• Causes: Defective developing unit M.
  Defective PWB.
• Remedy: Defective developing unit M. Replace the developing unit M.
  Defective PWB. Replace the sub front PWB or engine PWB and check for correct operation.

• Code: C7104
• Description: Toner sensor Y problem
  Sensor output value of 60 or less or 944 or more continued for 3 s.
• Causes: Defective developing unit Y.
  Defective PWB
• Remedy: Defective developing unit Y. Replace the developing unit Y.
  Defective PWB. Replace the sub front PWB or engine PWB and check for correct operation.

• Code: C7200
• Description: Broken internal thermistor wire
  An abnormal value is detected in the input data to inner temperature sensor 1.
• Causes: Poor contact in the connector terminals
  Defective laser scanner unit.
  Defective engine PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC13 on the engine PWB and laser scanner unit, and the continuity across the connector terminals. Repair or replace if necessary.
  Defective laser scanner unit. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.

• Code: C7210
• Description: Short-circuited internal thermistor
  An abnormal value is detected in the input data to inner temperature sensor 1.
• Causes: Poor contact in the connector terminals.
  Defective laser scanner unit.
  Defective engine PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC13 on the engine PWB and laser scanner unit, and the continuity across the connector terminals. Repair or replace if necessary.
  Defective laser scanner unit. Replace the laser scanner unit.
  Defective engine PWB. Replace the engine PWB and check for correct operation.