VIN and Temps are reading incorrect values
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While in the process of installing a new extruder I seem to have cause a problem. The most obvious symptoms are the VIN is reading 36.3 volts. Checking it with a meter reads 24 volts as expected. Hot end temp is reading 2000C and bed temp fluctuates ± 10C centering around 92. No difference in reading with or without the thermistors attached. MCU temp is reading 422.6C and it feels cool to the touch.
Printer is a RailCore II ZLT. Duet2 Wifi is running Firmware 3.3. I disconnected the Duex board and it didn't make any difference.
I verified the fuses were at least measuring 0Ω with a meter. Any idea of what is wrong would be a help. If the board is fried, at least I'd know I need a new one.
My config.g file:
config.g -
Thank you for the response. I had reached the conclusion that I had damaged something, and I don't have the tools or skill to repair the board. So I guess it's live and learn to be more careful, and be thankful that the board isn't more expensive.
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I should have added that I run external 5V to the Duet board to allow my to control PS_ON
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See here: https://forum.duet3d.com/post/222939
Seems like you may have damaged R80, which is the resistor in the voltage divider circuit, which measures voltage.
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Thank you for the response. I had reached the conclusion that I had damaged something, and I don't have the tools or skill to repair the board. So I guess it's live and learn to be more careful, and be thankful that the board isn't more expensive.
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Depending on where you're located you may be able to get it repaired.
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@bergy the first thing I would check is whether the 3.3V rail is OK. You can measure it between the 3.3V and ground pins of any endstop connector on the Duet. If it does measure close to 3.3V then it sounds to me that the ADC in the microcontroller is damaged.
Duet WiFi hardware designer and firmware engineer
Please do not ask me for Duet support via PM or email, use the forum
http://www.escher3d.com, https://miscsolutions.wordpress.com -
@dc42 the 3.3V rail measures 3.31, so that's OK. The ADC is probably damaged.
