Heatbed Connection Shorted
Has anyone seen an issue like this? Overnight my Mini+ stopped being able to maintain the heatbed temperature, today I looked and found this mess. The contact screws for the power to the board were both fairly secure, wondering what may have caused the short and if support has any recommendations on how to proceed? With what I'm seeing, I'm concerned that the electronics on the board itself may have been damaged as well, otherwise I'd just replace the cabling. Any thoughts?
Best Answer by mark:
Has anyone seen an issue like this? Overnight my Mini+ stopped being able to maintain the heatbed temperature, today I looked and found this mess. The contact screws for the power to the board were both fairly secure, wondering what may have caused the short and if support has any recommendations on how to proceed? With what I'm seeing, I'm concerned that the electronics on the board itself may have been damaged as well, otherwise I'd just replace the cabling. Any thoughts?
I am not sure it is a short. It may just have been a loose connection that got hot and opened up. I only see burning on one connection. A short would be across more than one thing.
I would contact Prusa support via chat and send pictures. They may provide troubleshooting direction, for example ohming out the heater. I expect you will have to replace parts. That does not look like it can clean up and the loose connection would still be there. The heat goes all the way up the wire from the eyelet to the crimp and beyond. You will definitely have to cut off some wire if you try to redo the connection. Cut back beyond where the copper has darkened, which I expect has happened inside the insulation.
If it is an open or loose connection, it is unlikely the electronics were damaged.
Regards,
Mark
RE: Heatbed Connection Shorted
Has anyone seen an issue like this? Overnight my Mini+ stopped being able to maintain the heatbed temperature, today I looked and found this mess. The contact screws for the power to the board were both fairly secure, wondering what may have caused the short and if support has any recommendations on how to proceed? With what I'm seeing, I'm concerned that the electronics on the board itself may have been damaged as well, otherwise I'd just replace the cabling. Any thoughts?
I am not sure it is a short. It may just have been a loose connection that got hot and opened up. I only see burning on one connection. A short would be across more than one thing.
I would contact Prusa support via chat and send pictures. They may provide troubleshooting direction, for example ohming out the heater. I expect you will have to replace parts. That does not look like it can clean up and the loose connection would still be there. The heat goes all the way up the wire from the eyelet to the crimp and beyond. You will definitely have to cut off some wire if you try to redo the connection. Cut back beyond where the copper has darkened, which I expect has happened inside the insulation.
If it is an open or loose connection, it is unlikely the electronics were damaged.
Regards,
Mark
RE: Heatbed Connection Shorted
Just as a follow up, I talked with support and as @mark suspected, I need to replace the heatbed + cables. I just put in an order for https://www.prusa3d.com/product/magnetic-heatbed-mini-24v/ , and will confirm that things are back in order once I've reinstalled. Support was also able to get me a voucher to cover the shipping, so I recommend that anyone who experiences a similar issue reach out to support as well before going ahead and ordering the replacement part.
It sounds like the issue was most likely the connections becoming loose over time. I'll be periodically taking the cap off and retightening those in the future :).
Thanks for the help!
RE: Heatbed Connection Shorted
On the mk2, MK3, MK4 series printers there are instructions to put washers n the outside of the heated connections.
It looks like you originally had washers between the copper pads and the ring connectors
Regards joan
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