• 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: 7601
• Description: ID sensor 1 (front) error
• Causes: Defective ID sensor. Defective PWB.
• Remedy: Defective ID sensor. Replace the ID sensor 1.
  Defective PWB. Replace the engine PWB check for correct operation.

• Code: 7602
• Description: ID sensor 2 (rear) errorr
• Causes: Defective ID sensor. Defective PWB.
• Remedy: Defective ID sensor. Replace the ID sensor 2.
  Defective PWB. Replace the engine PWB check for correct operation.

• Code: 7611
• Description: ID sensor (K) density error
  When ID sensor 2 detected CTD is 500 or less.
• Causes: Defective ID sensor. Defective PWB.
• Remedy: Defective ID sensor. Replace the ID sensor.
  Defective PWB. Replace the engine PWB check for correct operation.

• Code: 7612
• Description: ID sensor (C) density error
  When ID sensor 2 detected CTD is 500 or less.
• Causes: Defective ID sensor. Defective PWB.
• Remedy: Defective ID sensor. Replace the ID sensor.
  Defective PWB. Replace the engine PWB check for correct operation.