3D Printer steppers not working suddenly.

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James Muirhead

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Jul 13, 2021, 7:40:27 PM7/13/21
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This has proper stumped me...

I've got an old Delta printer I stuck a MKS SBASE (with DRV8825s (32x
microstep), Marlin 2.0.9.1) in and all of a sudden (it worked all
afternoon), all the motors now do not work. It'll preheat, I can turn
the fan on. But none of the motors work and immediately on homing it
comes up with homing failed. The weird thing is that when the power to
the board is off, it feels like the motors are enabled as they're really
stiff to turn, but all power is disconnected!

Anyone got any bright ideas? I've probably smegged something up in the
firmware!

-OJ.

nop head

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Jul 14, 2021, 2:45:19 AM7/14/21
to Sheffield Hackspace
Does that board have a separate power input for the motors and the heaters?

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Graham Driver

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Jul 14, 2021, 5:48:50 AM7/14/21
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Hi James

Do they stay stiff if disconnected from drivers?  Short-circuited coils lead to stiffness.

Disclaimer - I know next to nothing about 3D printers.

Regards

Graham
From: sheffield-har...@googlegroups.com <sheffield-har...@googlegroups.com> on behalf of James Muirhead <balls...@gmail.com>
Sent: Wednesday, July 14, 2021 12:40:25 AM
To: sheffield-har...@googlegroups.com <sheffield-har...@googlegroups.com>
Subject: [SHH:17184] 3D Printer steppers not working suddenly.
 

James Muirhead

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Jul 14, 2021, 7:45:08 AM7/14/21
to sheffield-har...@googlegroups.com, nop head

Nop...

No, it has only 1 power input.

The motors were working fine until at some point I tried a G33 and everything went pair shaped!

Graham...

After disconnecting the motors from the driver, they do seem to move unrestricted.

-OJ.

Graham Driver

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Jul 14, 2021, 8:59:59 AM7/14/21
to sheffield-har...@googlegroups.com, nop head
That behaviour might indicate that the drivers are shorted, but TBH it might be normal for the device; it is hard to say how the protection (or possibly parasitic) diodes react to generated emf when the power rail is at 0V.

Sent: Wednesday, July 14, 2021 12:45:05 PM
To: sheffield-har...@googlegroups.com <sheffield-har...@googlegroups.com>; nop head <nop....@gmail.com>
Subject: Re: [SHH:17187] 3D Printer steppers not working suddenly.
 

James Muirhead

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Jul 14, 2021, 9:54:46 AM7/14/21
to sheffield-har...@googlegroups.com, Graham Driver, nop head

Looks like I fudged the EEPROM / Firmware somehow.

I started over, only changing the basics. Did M502, M500, now everything works again.

Honestly do not know why!

-OJ

PS - I now cannot get it to do a Delta Calibration. Nor print! Think this thing is destined for the bin!

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