• Code: E5-40
• Description: Sort Memory Abnormal
• Causes: 1. Sort Memory defective. 2. SC PCB connector is disconnected. 3. SC PCB defective.

• Code: E7-90
• Description: Hardware Key Abnormal
• Causes: 1. Incorrect Hardware Key is installed. 2. Hardware Key is defective.

• Code: U01
• Description: CLOSE FRONT COVER
• Causes: 1. Front Cover is open. 2. Front Cover Sensor is disconnected. 3. Front Cover Sensor is defective. 4. LVPS connector is disconnected. 5. LVPS is defective. 6. Engine PCB is defective.

• Code: U13
• Description: TONER IS RUNNING LOW or OUT OF TONER
• Causes: 1. Toner Cartridge is incorrectly installed. 2. Low Toner. 3. Toner Sensor is disconnected. 4. Toner Sensor is defective. 5. Engine PCB connector is disconnected. 6. Engine PCB is defective.

• Code: U16
• Description: NO CARTRIDGE
• Causes: 1. No Toner Cartridge.

• Code: U20
• Description: CLOSE ADF COVER
• Causes: 1. ADF Cover is open. 2. ADF is not installed correctly. 3. ADF Cover Sensor is disconnected. 4. ADF Cover Sensor is defective. 5. LVPS connector is disconnected. 6. LVPS is defective.

• Code: U90
• Description: REPLACE BATTERY
• Causes: Backup Battery is wearing out.