ProtoCentre 999 Thermistor Replacement

Check the nozzle and bed temperature after power on the machine. Both temperature should be in between 30 to 40 degree before preheat. It is the room temperature.

If the temperature showing is below or too much above the room temperature, that means that any problem in heater or thermistor.

Remove the thermistor connection from the printer board of the nozzle.Remove the wire connector of the thermistor.

Take a multimeter and connect in the thermistors two leg by putting the multimeter knob into resistance value.

If the thermistor is showing a value of above 60 ohm means, it is working. Else you have to change the thermistor and connect it back in the same way. And go to next step.

Take the connecting wire of thermistor with connector at one end.

Take the multimeter, connect the prob of multimeter on the two ends of the wire and also go for continuity test option in the multimeter.

If it is having continuity, the multimeter will produce a beep sound, else we can understand the wire has to be changed.

After checking these things , reconnect the thermistor connection.

Now go to prepare

click preheat

Go to main menu, you can see the temperature is increasing or not.

If it is incresing, it means the nozzle is working.