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andy1583

U2 motors not working

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Posted · U2 motors not working

Hi,

I have an U2 here with absolutely no functional motors. The heaters are still working, but any time I try to do anything that involves moving the build plate or print head, the printer throws back a Z switch fault.

The switches appear to function correctly (there is continuity between the appropriate pins when it's pushed or not).

I would see if updating the firmware will fix it, or use pronterface, but the printer isn't connecting via USB either.

I've tried a factory reset, but now I'm stuck on the part where it wants me to calibrate the build plate, but gives the Z switch error instead.

Any help would be appreciated.

Andy

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Posted · U2 motors not working

@andy1583:

Did you get a "Z switch broken" (ER05) or "Z switch stuck" (ER06)?

Did you already made the tests, that are recommended on the error descriptions (https://ultimaker.com/en/resources/19488-z-switch-broken-or-z-switch-stuck or https://ultimaker.com/en/resources/23150-the-z-axis-is-stuck-or-the-limit-switch-is-broken)?

Have you recently disassembled anything on the printer? Do the motors move okay by hand?

If so, check if there are no pinched cables behind a cover or something along these lines.

The switches appear to function correctly (there is continuity between the appropriate pins when it's pushed or not).

Does that mean, that there's always continuity - regardless of the switch state?

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Posted · U2 motors not working

I have already done the tests, I get 'Z switch broken', I can hear the switch click when the screw comes into contact with it.

I can move the motors by hand with no problems.

No pinched cables, I'd not disassembled it recently up until I had the issue, I have now though, checking to see if there is any damage and to test the switch.

As for the continuity, I meant to say that the continuity switches along with the button press, so the connection shifts either side of the middle pin when the button is pressed.

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Posted · U2 motors not working

I think, this rules out a defective limit switch...

Since all motors do not work... @fbrc8-erin - does one of the "Safety" jumpers interrupts the electrical power to the motors? (perhaps it's just fallen out)

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Posted · U2 motors not working

If one of the safety jumpers it out, with the UM2 you should see a Safety Circuit error. If this was a UMO+ I don't think it presents the safety circuit error, but you'd encounter the same issue whether the motors don't move.

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