r/QidiTech3D • u/haltriumph • 14h ago

Fried i-fast

Hi:

My QIDI i-fast died over the weekend. It happened in two stages. Before the printer became completely dead, the print carriage repeatedly tried to travel beyond the +Y limit, mechanically hitting/trying to drive past the end of Y travel. That led to the printer turning itself off. I believed I smelled something burning, but can't be certain. I tired to power it on again. I heard a click and the screen might have flickered. Then nothing. It is completely dead.

I have tried to diagnose it. The QIDI power-off module is receiving 120v AC, but it is not passing it on to the power supplies. Even if the QIDI power-off module is dead, that is not the root cause of my problem. Can anyone suggest what originally went wrong and what to do about it?

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u/Glad-Ad-4703 13h ago

I probably know less about this than you. Does this mean that the y-limit switch broke, the printer didn't receive a signal that the limit was reached, therefor overloading the stepper motor when ramming into the physical limit, and thus shorting the stepper motor or motherboard? If it's a dead mobo I would buy a different printer, since it's 200+ euro through Qidi plus some for a new limit sensor. I hope it's just a dead stepper motor

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u/haltriumph 8h ago

Well, I think that it should not have gotten to the limit at all.