UM Original Doesn't Connect, Stepper Drivers Bad

[nanogru 0]

Hello. I have an ultimaker original. Initially I was having some issues where my layers would shift dramatically during a print. I tried belt tensioning, set screws, etc. but nothing helped. Eventually I found a link on the forum where somebody suggested upping the stepper motor current. I flipped the machine over, took off the fan cover and started adjusting the pots, but they just made the motors make strange noises. I turned it off and on again and now the printer won't even connect. The electronics fan doesn't turn at full speed and the ulticontrolller doesn't display anything. Please help, I really need to do a print. Thanks guys.

 

[tommyph1208 55]

This sounds like you wasted the 12v regulator on your board (maked IC1), did you have the printer turned on for long periods of time without the fan blowing on the electronics? eg. while you were adjusting the stepper drivers?

You may want to have a look at these other posts:

http://umforum.ultimaker.com/index.php?/topic/3426-classic-ultimaker-just-died-only-green-led-lights/

https://groups.google.com/forum/m/#!topic/ultimaker/voS2qlOs8-k

If you have a multimeter, try measuring the voltage across the pins of the 12V regulator component... if you turn the board/printet so that the 12v regulator is closest to you, it should be 19V between the middle and left pins and 12V between the middle and right pin...