UM2+: Build Plate Doesn't Heat at All

[mowijo 0]

hi All.

 

I have a UM2 that, at a commercial service point, was upgraded to an 2+ some years ago. I have recently discovered, that the buildplate doesn't heat at all. It stays at room temperature while printing. The printer prints fine and no errors wrt. build plate are displayed. The build plate simply stays cold. I have always been printing in PLA on a BuiltTak sticker, and that has worked without any problems - even on a room temperature build plate it seems. The other day I tried PETG and it wouldn't stick and that is when I got aware of the cold build plate.

 

Does anybody have any ideas on how to fix this so my buildplate will heat up again?

Best regards,

    Morten

 

P.S.: The time for potentially complaining to the service point is legally and morally long over due, so I have to fix this m y self.

[Torgeir 228]

@mowijo

 

Hi Morten

 

I've assume that you'll know that the temperature is selected by the firmware (when a given type of filament are selected), or by directly adjusting the bed temp on the printer during printing.

You may also test this directly by using the advanced menu found under the maintenance menu.

If you can see the "heat bed" temperature, -should be close to the nozzle temperature then we may consider the temp sensing ok.

 

So, if this is true we may suggest the heating of the bed "circuit" is to blame.

What happen if you try to rice the temperature? Did you get any warning?

 

Problems often found here is the contact block, either of the heat bed, or the contact block at the main PCB.

The contact blocks, may look burnt (brownish), or simply have an open line on the heat bed. This latter happen due to expansion/retraction when the bed is heated/cooled due to use over times.

 

As you now have the diagram, you'll sure find the circuit block. etc.

 

 

Good luck.

Thanks

Torgeir