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mbef

Burned Heated Bed Connector

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I suspected there was something funny when my UM2 (now UM2+) smelled a bit different.

But when I saw some magic smoke coming out of the wires at the back of the heated bed, and then a little sparking, my suspicions were confirmed. Something bad was going down. On close inspection, the big heater power wires were charred to carbon, and on removing the build-plate and bed assembly, the main brown wire (#2) was melted into the connector. The connector is toast - literally.

It has made me think, because we've had a few Temp Sense Error: BED alerts over the years, which get better when you poke the bed wires: wondering if the wires were loose, or whether the connector is up to handling the current (this is a 2013 machine, I recall seeing comments to that effect). I inspected them when we did the UM2+ upgrade in the summer, and they seemed ok then.

I unsoldered the connector, and unfortunately the connector came away with the two thermistor pads - I think the solder wasn't melted properly because the heated bed was acting as a heat-sink, and perhaps they had degraded with heat. Not a total disaster: I think I can solder a wire to the stub ends of the tracks.

But I need to reconnect the four wires to the board. So my questions are:

1. Does anyone know where I can source a replacement connector, please? I've been digging around on RS and Digikey, but I can't see one like it.

OR

2. Are there any standard hacks for this situation? I'm wondering about soldering new wires to the bed PCB, clamping/restraining them to the bed using the existing connector mount screws, and then using a separate connector to affix the supply wires - is that feasible?

OR

3. Am I an idiot who needs to buy a new heated bed?

Edited by Guest

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Hey Torgeir, thanks for that ... yep, I was looking at those, but I was rather hoping to find the exact connector - that way, I won't have to do too much improvisation around mounting and fixing it. I've become a bit cautious after the smoke and sparks :-)

Cheers,

Mbef

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If your in the US FBRC8 has the bed parts. I had the same exact thing happen to me and they sent me a new bed and connectors. They told me UM had problems with this so they changed the connection type to push pins.

This is what my connector looked like when I hit it with the FLIR. I was noticing a smell for a few weeks that smelt like wet dog and couldnt find the source until I started seeing smoke. IMG_0963.JPG.thumb.jpeg.f10af9f25caa88937d608c0da6fd0d2b.jpeg

IMG_0963.JPG.thumb.jpeg.f10af9f25caa88937d608c0da6fd0d2b.jpeg

Edited by Guest

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