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 • Too much load on the drive mechanism
Code: 541
Description: Unstable fusing temperature During warm-up, the fusing temperature rises by less than 20 °C during 11 seconds. The fusing temperature detected by the thermistor was 0 °C 5 seconds after the fusing relay was turned on.
Causes: • Thermistor defective • Fusing lamp open • Fusing thermostat open • Power supply board defective • Poor connection of the fusing unit
Code: 542
Description: Fusing temperature warm-up error The fusing temperature does not reach more than 80 °C 17.5 seconds after the main switch is turned on.
Causes: • Thermistor defective • Fusing lamp open • Fusing thermostat open • Power supply board defective • Poor connection of the fusing unit
Code: 543
Description: Fusing overheat error A fusing temperature of over 245 °C is detected for 1 second by the fusing thermistor. A fusing temperature of over 235 °C is detected for 1 second after the fusing lamp has been turned off.
Causes: • Fusing thermistor defective • Power supply board defective
Code: 545
Description: Fusing lamp stays on The fusing lamp stays on more than 12 seconds after the main motor has been turned off.
Causes: • Fusing thermistor defective • Power supply board defective • Poor connection of the fusing unit
Code: 546
Description: Unstable fusing temperature During standby, within 500 ms, the fusing temperature goes below 60 °C twice or over 60 °C three times. Within 1 minute, a 60 °C increase or decrease in fusing temperature is detected during five different onesecond intervals.
Causes: • Fusing thermistor defective • Power supply board defective • Poor connection of the fusing unit