Description: Development bias leak
60% or more of the PWM duty output is detected for 0.2 seconds when the development bias is generated by the development roller.
Causes: • Cartridge (development roller) defective • High voltage supply board defective
Code: 520
Description: Main motor lock
A main motor lock signal is not detected for more than 700 ms after the main motor starts to rotate, or the lock signal is not detected for more than a certain time during rotation after the last signal.
Causes: • Main motor defective • Harness broken • Too much load on the drive mechanisme
Code: 530
Description: Fusing fan error
The CPU detects the fusing fan lock signal for more than 3 seconds.
Causes: • Poor connection of the fusing fan • Fusing fan defective
Code: 531
Description: PSU fan error
The CPU detects the PSU fan lock signal for more than 3 seconds.
Causes: • Poor connection of the PSU fan • PSU fan defective
Code: 541
Description: Thermistor error
The fusing temperature detected by the thermistor is 0°C for 7 seconds after the fusing relay has been turned on.
Causes: • Thermistor defective
Code: 542
Description: Fusing temperature warm-up error
The fusing temperature does not increase by 7°C for 10 seconds. The fusing temperature does not reach more than 135°C for 24 seconds after the main switch is turned on.
Causes: • Thermistor defective or deformed • Fusing lamp open • Fusing thermostat open