Burned out RAMBo?
Ah so hope this can be easily fixed by resoldering.
But is this burned out? or just the connection is shot?
Tried to do a print tonight and couldn't get the bed to heat up. The bed is fine so took a look at the RAMBo and noticed this for the BED+ connection:
Re: Burned out RAMBo?
Quick diagnostic to see if the connection is shot, I'd recommend getting a multimeter and probing the connection to see if it is getting the proper voltage when you enable to heated bed.
Re: Burned out RAMBo?
Hi Scott
That can also happen if the connector has been hand-soldered, but as your bed is not working, it does rather look as though you have experienced a heat issue.
As previously suggested, you can check the output with a DMM; best to probe those two solder pads with the heater turned on. Then ut the probes into the heater sockets on the other side of the board.
If you have 12V (or just under) on the pads but not the socket (which I guess will be the case) best thing to do is to solder the heater wires directly onto the solder pads of the RAMBo.
The other thing is that the heater cable could have broken within the PVC sheath (as mine did a couple of months back). Set the DMM to resistance, unplug the heater connector and probe the solder pads on the heater (should be about 1.5 Ohms) and do the same at the connector or RAMBo end of the heater cable. Wiggle the cable about a bit to see if the reading changes.
Peter
Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…
Re: Burned out RAMBo?
Ok. Will get everything back together and try it out. See what I get.
The bed does heat up. Kinda switch it to the nozzle and heat up ever so slightly and the bed does turn on to heat. If you go too much, you burn out a fuse! But it is a good way to tell if it is the bed or not.
Plus I have always had issues with the plug. Had to giggle it every now and then to get it to work. Something about the connection of the plugs or the wiring of it all just looks messy and cluttered to me. Which screams issues.
Thanks as always.
Ah if it isn't one thing.. its another! lol
Love this little guy and he is going to go in for an upgrade as soon as the MK2 parts arrive. Just need to make him up to snuff before hand.
Re: Burned out RAMBo?
Scott
The Mk2 kit may have the new heater with a plug already fitted, but that won't help your (possibly) damaged RAMBo socket, so you will more than likely have to solder that one in place.
Never a good idea to plug the bed into the extruder socket, unless you have a few spare fuses.The heater probably draws most current when cold (around 9 Amps) and the fuse can blow quicker than you could turn it off.
Peter
Please note: I do not have any affiliation with Prusa Research. Any advices given are offered in good faith. It is your responsibility to ensure that by following my advice you do not suffer or cause injury, damage…
Re: Burned out RAMBo?
That looks like just a cold solder joint, not from an over current situation. Assuming things arn't cooked, a quick reflow with some solder will easily fix that up.