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RDominelli
(@rdominelli)
Active Member
Connector from Bed to Board

I had been experiencing thermal runaway issues.  I tried a new part cooling fan cowl but as soon as my fan turned on I had issues unless I turned the fan way down.  A silicon sock fixed this.... but I think I may have been over drawing current to the bed.

Today my heat bed stopped working. After working basic trouble shooting I discovered no power was reaching the board. Opening up the case and removing the heat bed connector revealed that the heat bed side of the connector attached to the wires,  had carbonized and now consisted mainly of chunky powder with a couple of metal tines sticking out.  I cleaned the socket out and confirmed that when I preheat the bed I do see power coming out of the 2 pins.  

 

Can someone let me know what this connector is actually called so I can obtain a new one?

I have also confirmed that neither fuse had blown which I was a little surprised about.

Rich

Posted : 30/09/2020 9:57 pm
cwbullet
(@cwbullet)
Illustrious Member
RE: Connector from Bed to Board

Are you referring to the forked spade connectors or the terminals?

--------------------
Chuck H
3D Printer Review Blog...
Posted : 30/09/2020 11:25 pm
RDominelli
(@rdominelli)
Active Member
Topic starter answered:
RE: Connector from Bed to Board

This is the molex type connector which goes to the rambo board.

Posted : 30/09/2020 11:30 pm
cwbullet
(@cwbullet)
Illustrious Member
RE: Connector from Bed to Board

I think you are referring to the bed thermistor.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 01/10/2020 2:49 am
karl-herbert
(@karl-herbert)
Illustrious Member
RE: Connector from Bed to Board
Posted by: @rch-d

I had been experiencing thermal runaway issues.  I tried a new part cooling fan cowl but as soon as my fan turned on I had issues unless I turned the fan way down.  A silicon sock fixed this.... but I think I may have been over drawing current to the bed.

Today my heat bed stopped working. After working basic trouble shooting I discovered no power was reaching the board. Opening up the case and removing the heat bed connector revealed that the heat bed side of the connector attached to the wires,  had carbonized and now consisted mainly of chunky powder with a couple of metal tines sticking out.  I cleaned the socket out and confirmed that when I preheat the bed I do see power coming out of the 2 pins.  

 

Can someone let me know what this connector is actually called so I can obtain a new one?

I have also confirmed that neither fuse had blown which I was a little surprised about.

Rich

You mean this plug here ? -  https://shop.prusa3d.com/de/mk3mk3s/125-molex-connector-heater-cartridge-heatbed-psu.html

Molex, Art. Nr (39530-0002): https://www.molex.com/molex/products/part-detail/terminal_blocks/0395300002

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 01/10/2020 6:58 am
cwbullet
(@cwbullet)
Illustrious Member
RE: Connector from Bed to Board

@karl-herbert

I got confused between the 2.5 and 3.  If you are in the US, I wore one out and bought 10 through Amazon.  Not prime but is came pretty quick.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 01/10/2020 8:57 am
RDominelli
(@rdominelli)
Active Member
Topic starter answered:
RE: Connector from Bed to Board

@charles-h13

Thank you very much. Ordered.

Posted : 01/10/2020 9:27 am
karl-herbert
(@karl-herbert)
Illustrious Member
RE: Connector from Bed to Board

@charles-h13

Thanks for the link. Unfortunately, it is often the case that the products are not available here. I don't know if this depends on the country I want to order from:

I bought them at molex.com.

Product "MOLEX 39530-0002" is compatible with MK 2 and 3 series.

Statt zu klagen, dass wir nicht alles haben, was wir wollen, sollten wir lieber dankbar sein, dass wir nicht alles bekommen, was wir verdienen....
Posted : 01/10/2020 9:33 am
cwbullet
(@cwbullet)
Illustrious Member
RE: Connector from Bed to Board

@karl-herbert

I think that is a huge problem with Amazon and international buyers.  I wish it was universal.  They are available for $3 on eBay.  

--------------------
Chuck H
3D Printer Review Blog...
Posted : 01/10/2020 10:06 am
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