Dim3nsioneer 558
Another possibility to drive a UM1 into the wrong z direction during homing is a customized firmware (self compiled or downloaded from marlinbuilder.robotfuzz.com) with the wrong settings at 'invert z axis'. Forget it if you have the default firmware installed.
EDIT: My last phrase was maybe misleading. The meaning was: If the default firmware is present then there should not be a problem with the firmware. In this case, nothing has to be changed.
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IRobertI 521
Just one question first, you haven't updated the firmware and installed the UM2 version of the firmware by mistake? The UM2 homes towards the bottom.
If not, it's easy to switch the cables around. If you look into the end of the connector you will see tiny little "barbs" that keep the metal contacts from coming out of the plastic housing. Use a needle to push these barbs in so that you can pull the cable out. After you've done that it's just a matter of plugging the cables back in the correct order. You might need to bend the little barbs out slightly before re-inserting the cable to make sure it latches on. You'll know if you need to do that as the cable will pull out if you tug on it.
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