• Code: E5-74
• Description: AFE PCB Abnormal 1
• Causes: 1. AFE PCB is defective. 2. SC PCB is defective. 3. AFE Harness is defective. 4. Check the AFE PCB connector. (CN855) 5. Check the SC PCB connector. (CN57)

• Code: E5-75
• Description: AFE PCB Abnormal 2
• Causes: 1. AFE PCB is defective. 2. SC PCB is defective. 3. AFE Harness is defective. 4. Check the AFE PCB connector. (CN855) 5. Check the SC PCB connector. (CN57)

• Code: E5-80
• Description: EC PCB Mismatch
• Causes: 1. Incompatible EC PCB. 2. EC PCB is defective.

• Code: E5-81
• Description: LSU Mismatch
• Causes: 1. Incompatible LSU. 2. LSU is defective.

• Code: E5-82
• Description: SC PCB Mismatch
• Causes: 1. Incompatible SC PCB. 2. SC PCB is defective.

• Code: E5-90
• Description: LSU & PCB Mismatched
• Causes: 1. LSU is incorrect. 2. EC PCB is incorrect. 3. LSU is defective. 4. EC PCB is defective.

• Code: E5-91
• Description: Serial Number Mismatched
• Causes: Register Serial Number again.

• Code: E7-21
• Description: Finisher Paper Exit Motor
• Causes: 1. Paper Feed Motor connector is disconnected. 2. Paper Feed Motor is locked by Paper Jam.