• Code: E3-03
• Description: Toner Density Sensor Gain
• Causes: 1. Sensor connector disconnected. 2. Sensor defective. 3. SPC PCB connector disconnected. 4. SPC PCB defective.

• Code: E3-20
• Description: Main Motor Rotation
• Causes: 1. Drive Mechanism defective. 2. Main Motor connector disconnected. 3. Main Motor defective. 4. SPC PCB connector disconnected. 5. SPC PCB defective. 6. LVPS defective.

• Code: E3-40
• Description: Copy Density Sensor Output Adjustment
• Causes: 1. CDS PCB connector disconnected. 2. CDS PCB defective. 3. SPC PCB connector disconnected. 4. SPC PCB defective.

• Code: E4-01
• Description: Fuser Warm-up Temperature
• Causes: 1. Fuser Thermistor dirty. 2. Thermistor position incorrect. 3. Thermistor defective. 4. Thermistor connector disconnected. 5. Fuser Lamp connector disconnected. 6. Fuser Lamp defective. 7. Fuser Thermostat defective. 8. Thermal Fuse defective. 9. ACD PCB connector disconnected. 10. ACD PCB defective. 11. NFL PCB connector disconnected. 12. NFL PCB defective. 13. SPC PCB connector disconnected. 14. SPC PCB defective. 15. Fuser temperature low. (Adjust F6-31)

• Code: E4-02
• Description: Fuser Paper Jam
• Causes: 1. Paper Jam in Fuser Unit. 2. Paper Exit Sensor 1 or 2 disconnected. 3. Paper Exit Sensor 1 or 2 defective. 4. SPC PCB connector disconnected. 5. SPC PCB defective.

• Code: E4-10
• Description: Fuser Fan Motor Rotation
• Causes: 1. Fuser Fan connector disconnected. 2. Fuser Fan defective. 3. SPC PCB connector disconnected. 4. SPC PCB defective. 5. LVPS defective.

• Code: E5-05
• Description: Vp (+24V, Scanner)
• Causes: 1. SDR PCB connector disconnected. 2. SDR PCB defective. 3. SPC PCB connector disconnected. 4. SPC PCB defective. 5. LVPS defective.

• Code: E5-11
• Description: Printer Engine Communication Abnormal
• Causes: 1. SPC PCB connector disconnected. 2. SPC PCB defective. 3. SC PCB connector disconnected. 4. SC PCB defective.