ProtoCentre 999 Thermistor Replacement
abhishek j and 3 other contributors
Last updated on Feb 8, 2023
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What you need
Tools
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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.
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If the temperature showing is below or too much above the room temperature, that means that any problem in heater or thermistor.
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Remove the thermistor connection from the printer board of the nozzle.Remove the wire connector of the thermistor.
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Take a multimeter and connect in the thermistors two leg by putting the multimeter knob into resistance value.
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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.
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Take the connecting wire of thermistor with connector at one end.
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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.
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If it is having continuity, the multimeter will produce a beep sound, else we can understand the wire has to be changed.
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After checking these things , reconnect the thermistor connection.
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Now go to prepare
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click preheat
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Go to main menu, you can see the temperature is increasing or not.
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If it is incresing, it means the nozzle is working.
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To reassemble your device, follow these instructions in reverse order.
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