Extruder Thermometer 60 Degrees Off
Hi, I am working with the Original Prusa XL 5-head printer.
One of the 5 nextruders seems to have an incorrectly functioning thermometer. During the calibration test where all extruders must have a stable temperature of 70 degrees, the 4th nextruder stabilizes at 130 degrees.
However, its temperature is actually 70 degrees.
I am not sure what this error could be. It is heating to the correct temperature, but the LCD screen indicates it is 60 degrees too hot. I suppose this could be due to a variety of reasons.
Any ideas .. ?
RE: Extruder Thermometer 60 Degrees Off
UPDATE
I've successfully managed to fail the heater test. The nozzle in question always starts around 130 degrees celsius and never makes it higher than 144 degrees throughout the test. I don't believe it is ever at 130 degrees, and the fact that it never heats up seems to imply it has a bad component..
RE:
When I took the nextruder off the dock while the machine was on and started tapping the extruder, I inadvertently twisted the wires slightly and either by tapping it (manipulating the touch sensor) or twisting the wires while tilting it, I managed to convince the firmware the nextruder was faulty. A red light started strobing under the LCD screen and a red dashboard appeared with a barcode and instructions.
Following the guide indexed by the bar code, I opened the dwarf case and wiggled the thermistor and power connectors a bit. The thermistor connector seemed to seat itself a bit better, so I tried it out.
Upon reboot, suddenly the problem nextruder AND its neighbor bugged out. But I figured it was some state machine healing itself, so I reset the machine one or two times and all of the nextruders started working.
I re-ran the heat test, and for a minute things were touch and go -- the two buggy nextruders were working great, but everyone else was wonky. I waited for the entire test to finish, and whatever logic or control alg behind the scenes was able to heal its state and tell all the nextruders to warm up and cool down (eventually).
Didn't run into any further issues after that.