Toolboard 1LC Fan RPM - Failing Board or fan?
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My 1LC toolboard runs a Mosquito Magnum hotend with a 12 volt Noctua 4010 fan 3 wire 2200 RPM, using Out2. This toolboard has performed normally for the last 5 months. in the last few weeks the fan has been reporting odd RPMs. It showed 1200 a few times and i removed some filament strings from the fan blades which seemingly fixed the issue. but the last few weeks the fan becomes more erratic reporting 3100 RPM, 2800 RPM, 3500 RPM etc. however visually the fan appears to be running the correct speed. i do occasionally notice the fan blades slow down to the point i can see them, then it speeds back up again. the fan is now at the point where it always reports 3100 RPM but it should run at 2200 RPM.
i am unsure if the fan is failing or the 1LC is failing. i checked the pins on the board with a multimeter and the toolboard shows the proper voltage (reading 12.3 volts). the board MCU temperature reports normal around 45C. is there anyway to determine if the 1LC is failing or the fan is failing, or something else is happening?
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@RogerPodacter it's unlikely that the 1LC is failing in that respect. However, if the tacho wire from the fan runs very close to the stepper motor wire, then it could pick up interference which would cause it to overread.
