Description: Main motor error
A main motor lock signal is not detected for more than 7 consecutive checks (700 ms) after the main motor starts to rotate, or the lock signal is not detected for more than 7 consecutive checks during rotation after the last signal.
Causes: - Too much load on the drive mechanism
- Main motor defective
Code: 502
Description: Tray 2 lift motor malfunction (Optional paper tray units)
The paper lift sensor fails to activate twice continuously after the tray lift motor has been on for 18 seconds.
Causes: - Paper lift sensor defective
- Tray lift motor defective
- Too much load on the drive mechanism
- Poor tray lift motor connection
Code: 503
Description: Tray 3 lift motor malfunction (optional paper tray units)
The paper lift sensor fails to activate twice continuously after the tray lift motor has been on for 18 seconds.
Causes: - Paper lift sensor defective
- Tray lift motor defective
- Too much load on the drive mechanism
- Poor tray lift motor connection
Code: 504
Description: Tray 4 lift motor malfunction (optional two-tray paper tray unit)
The paper lift sensor fails to activate twice continuously after the tray lift motor has been on for 18 seconds.
Causes: - Paper lift sensor defective
- Tray lift motor defective
- Too much load on the drive mechanism
- Poor tray lift motor connection
Code: 506
Description: Paper feed motor lock (optional paper tray units)
A motor lock signal is not detected for more than 1.5 s or the lock signal is not detected for more than 1.0 s during rotation.
Causes: - Paper feed motor defective
- Too much load on the drive mechanism
Code: 541
Description: Fusing thermistor open (center)
The fusing temperature detected by the thermistor is below 71C and is not corrected after the main power switch is turned on.
Causes: - Fusing thermistor defective or out of position
- Power supply board defective
- Loose connectors