Notifications
Clear all

No Power to Heat Bed  

  RSS
Grandpa Joe
(@grandpa-joe)
Eminent Member
No Power to Heat Bed

I have MK2.5s and it has lost power to the heat bead.

  • All connections tight
  • All cables checked - no damage.
  • Connections to Rambo board are tight and secure.
  • Voltage to Hot end is 12 volts
  • Voltage to heat bed is 3.4 volts

I detached heat bed power cables from Rambo Board and checked the poles inside the connector -  3.4 volts

I detached the heat bed power cables and tested the poles inside its Rambo attachment. -  12 volts. 

Prusa tech chat says Rambo Board needs replacing.    Prusa doesn’t have one, and their supplier in the US doesn’t have one.   Does anyone out there have any ideas or suggestions ?

Posted : 29/04/2022 8:59 pm
cwbullet
(@cwbullet)
Member
RE: No Power to Heat Bed

Did you check all of the fuses?

--------------------
Chuck H
3D Printer Review Blog

Posted : 01/05/2022 1:42 am
Grandpa Joe
(@grandpa-joe)
Eminent Member
Topic starter answered:
RE: No Power to Heat Bed

Yes, all fuses are fine.  

Posted : 01/05/2022 4:29 pm
karl-herbert
(@karl-herbert)
Illustrious Member
RE:

I would check the internal resistance of the heating bed. The value should be around 1 Ohm (12V). If the resistance deviates significantly, the heating bed may be defective.

https://help.prusa3d.com/article/multimeter-usage_2117 (see table).

wbr,

Karl

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 : 01/05/2022 8:08 pm
Share: