any one know how to get a mk2 heat bed to work with rambo

[spart]

not to sure if i got to do some kinda setting in arduino but every time i kick in the hotbed my power shuts off when i hit the button in repetier host , the hot end working great now that i dont have the resisters wired back to them self {dah} tested hotbed with 4 inch wire right into mosfet out put and it dies soon as i hit button and got to do a reset

any one know am i over juicing and got to set something lower in arduino?

[Polygonhell]

What resistance do you measure from the bed?
Generally if the PSU is shutting down it's either a short, or trying to pull too much power from the PSU.

[spart]

what can i safely trun the power up to and not fry my rambo borad i have a 12v 20a power supply got it set to 12.90 now just seems to cough out when i hit the button

[cambo3d]

got photos of your heatbed wiring. did you solder connections to it? (the heatbed that is)

[spart]

the hot bed has a 1K Ohm resistor on it thats all i know

[Polygonhell]

the hot bed has a 1K Ohm resistor on it thats all i know

That's just a pull-up resistor for the LED.
Most beds are in the 1.2 to 1.5 OHM range, you need to measure it with a meter. Some I've seen are below 1 OHM and this can cause issues.
Honestly it's most likely that you're just pulling to much current from the PSU, either a short or the PSU is just not quite up to it's rating.

[spart]

12.14 coming out at the mosfet output heated bed post when i hit the button is that right

[spart]

meter set to 200 ohm setting iam getting 2.0 on the post of hotbed

[Polygonhell]

You need to measure it disconnected from the RAMBO.

[spart]

ya i did, i un-sodered the hot bed and metered , it came to 2.2 with out wires and i put new ones on and getting same 2.2 ohms

[cambo3d]

what i was trying to see was if you shorted the solder connections.

pic would help.

[spart]

some pics. this hotbed came with pre sodered resister and led.

[cambo3d]

hard to tell anything from those pics

[spart]

hot bed rated for 10amp would changing the fuse down to 10 from 15 work

[Polygonhell]

No the odds are the issue is the PSU.

[spart]

ya might be going to look for new one, not to sure seams like a lot of people having same problem. i did notice when i first did it that the led resister did flash red when i first hooked it up so think i am over powering it, took off resister and the led and that didnt fix it just in case i cooked it. so doing some home work on it seams like iam not the only one with this problem with this 1.1b board. i am getting full power Scotty but the ship cant handle it lol, just triping power off, i know my mk2 board is rated for only 12v 10 amps so going to throw a 10 amp in tomorrow see if i can get the fazers to fire or make a fire lol hope that works then this will be a ( fully operational printing station )

[Captain Starfish]

First post on this forum and a +1 to the issue.

Will disconnect the Onxy and measure its impedance and the voltage being spat out of the RAMBO when I switch the bed on.

Have updated the firmware to the latest version from the SeemeCNC website.

Dammit, I wanna play with my new toy!!

[Captain Starfish]

ooops.

Went a little overboard with the bed wires and they didn't want to fit into the RAMBO screw block, guessing there were a couple of strays which were shorting. Cleaned up and all happy now.

And another ooops for posting in the wrong forum...