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Comment on [Troubleshooting] It's the clog guy again - temp readings are bad!

lemmyman@lemmy.world ⁨6⁩ ⁨months⁩ ago

I suspect an electrical issue on the motherboard.

What happens if you swap the bed and hotend thermistor, and/or plug one of your reference thermistor into the bed input?
What is the open-circuit voltage on the signal line of the hotend and bed thermistor inputs?
What is the short-circuit current of the same?

If you see differences in those last two points, that is a clue that something is messing with the divider circuit that the thermistor is a part of.

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papalonian@lemmy.world ⁨6⁩ ⁨months⁩ ago

I suspect an electrical issue on the motherboard. What happens if you swap the bed and hotend thermistor, and/or plug one of your reference thermistor into the bed input?

This is one of the tests mentioned in my post:

I also feel the motherboard can be removed as well; there are three pins for thermistors, all three show accurate readings for the bed but identically inaccurate readings for the nozzle.

As to your other two points, I myself know very little of reading electrical signals, but my EE friend was over earlier today helping with troubleshooting and he verified that nothing on the board was reading out of the ordinary.

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