Switching D8 and D9

Hello guys, can you tell me how I can switch the D8 and the D9 port on the RAMPS 1.4 in the Repetier Firmware? I am not into all that software stuff and need some advice here since my standard D8 port for the heated bed is broken and I can't control it properly.

Don't use the heated bed on an other outlet. D8 has a extra and bigger fuse for the heated bed. D9/D10 are reserved for extruder or fans and have a smaller fuse. So using that will most likely trigger that fuse. You should better wait a half our with printer disconnected for the fuse to reset (normally you get it with a resettable polyfuse but it takes some time to reset). Also check your bed resistance. They often vary a from bed to bed and if to low it can consume to much for your fuse.

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So you say that it is not recommended to switch those pins? The problem is that my D8 port is constantly in on-mode. It would be no problem for a fan or sth that has to run all the time anyways but for something like the heated bed where I need to control it and turn it off at an certain point this is not possible. But thanks for your advice, so I have to fix that problem with my D8 port - I think it has sth to do with the MOSFET. I try to replace it and hopefully it will get better.


EDIT: I forgot that I just need to control a relay through that port. So it shouldn't cause any problems if I use D9 for the relay (that is controlling the heated bed). The fuse should be all right. Can you tell me how to switch D8 and D9?

Edited 1 time(s). Last edit at 06/14/2014 03:18PM by LesSV.