Error Code: C-3903 Follow

Classification
Main body: Fusing belt edge high temperature abnormality (hardware detection)
 

Cause
The fusing temperature sensor/2 (TH2) detects an error signal continuously for a specified period of time.
 

Measures to take when an alert occurs
The main body and the option stop immediately.
 

Estimated abnormal parts
• Fusing unit
• Printer control board (PRCB)
• DC power supply/1 (DCPS1)
• Fusing temperature sensor/2 (TH2)
 

Correction

Solution
1. Check the connection between the rear side connector of the fusing unit and the main body side connector, and repair it when there is any abnormality.
2. Check the connector connections between TH2 and PRCB, and the wiring. Then repair it when there is any abnormality. (Wiring diagram: Main body (1/5): 8-H)
3. Check the installation condition of the fusing heater lamp and ON or OFF by IO Check (45-00) and others, and repair it when there is any abnormality. (Wiring diagram: Main body (1/5): 2-F, 2-G)
Note
▪ The output check on the IO check mode has restrictive conditions. Check the IO check mode list before the output check.
4. Check the installation condition of the TH2 and the temperature of the IO Check (45-12) and others, and adjust it when there is any abnormality. (Wiring diagram: Main body (1/5): 3-H)
5. Replace TH2.
6. Replace PRCB.