• Code: 7210
• Description: Short-circuited internal thermistor
  • The value of input from the internal thermistor 0.3 V or less is detected.
• Causes: Poor contact in the connector terminals. Defective engine controller PWB.
• Remedy: Poor contact in the connector terminals. Check the connection of connector YC3 on the engine controller PWB and the continuity across the connector terminals. Repair or replace if necessary.
  Defective engine controller PWB. Replace the engine controller PWB.

• Code: 7301
• Description: Toner hopper error (black process unit)
  • When black toner is replenished (simple replenishment), if the replenishment release level is not reached even if black toner is replenished for 3 s (1 s) with the black toner low level not detected, the state is regarded as a black toner container non-installing error. This error occurs four times.
• Causes: Black toner container is not installed. Defective engine controller PWB.
• Remedy: Black toner container is not installed. Check the state of the black toner container and install it properly.
  Defective engine controller PWB. Replace the engine controller PWB.

• Code: 7302
• Description: Toner hopper error (cyan process unit)
  • When cyan toner is replenished (simple replenishment), if the replenishment release level is not reached even if cyan toner is replenished for 3 s (1 s) with the black toner low level not detected, the state is regarded as a cyan toner container non-installing error. This error occurs four times.
• Causes: Cyan toner container is not installed. Defective engine controller PWB.
• Remedy: Cyan toner container is not installed. Check the state of the cyan toner container and install it properly.
  Defective engine controller PWB. Replace the engine controller PWB.

• Code: 7303
• Description: Toner hopper error (magenta process unit)
  • When magenta toner is replenished (simple replenishment), if the replenishment release level is not reached even if magenta toner is replenished for 3 s (1 s) with the magenta toner low level not detected, the state is regarded as a magenta toner container non-installing error. This error occurs four times.
• Causes: Magenta toner container is not installed. Defective engine controller PWB.
• Remedy: Magenta toner container is not installed. Check the state of the magenta toner container and install it properly.
  Defective engine controller PWB. Replace the engine controller PWB.

• Code: 7304
• Description: Toner hopper error (yellow process unit)
  • When yellow toner is replenished (simple replenishment), if the replenishment release level is not reached even if yellow toner is replenished for 3 s (1 s) with the yellow toner low level not detected, the state is regarded as a yellow toner container non-installing error. This error occurs four times.
• Causes: Yellow toner container is not installed. Defective engine controller PWB.
• Remedy: Yellow toner container is not installed. Check the state of the yellow toner container and install it properly.
  Defective engine controller PWB. Replace the engine controller PWB.

• Code: 7600
• Description: Toner ID sensor problem
  • The sampling input of toner ID sensor 1 and toner ID sensor 2 without patch exceeds the threshold respectively.
• Causes: Defective toner ID sensor 1 or 2. Defective engine controller PWB.
• Remedy: Defective toner ID sensor 1 or 2. Replace the transfer unit.
  Defective engine controller PWB. Replace the engine controller PWB.

• Code: 7610
• Description: Image density measurement timing problem
  • The measured value of density patch is abnormal.
• Causes: Faulty density due to a mechanical cause.
• Remedy: Faulty density due to a mechanical cause. Check the drum unit, high voltage unit, developing unit, and transfer unit. If any problem is found, replace the unit.

• Code: 7620
• Description: Color registration timing error
  • The number of PG lines for registration correction 32 is not detected properly
• Causes: Defective engine controller PWB.
• Remedy: Defective engine controller PWB. Replace the engine controller PWB.