On 2/10/2015 2:02 PM, Oltimer wrote:
On 2/10/2015 10:26 AM, Garrett Fulton wrote:
My Lincoln Square Wave 175 tig/stick machine stopped working in tig
mode. Did the t/s and called Lincoln and they agreed it was the
control board bad. $483 for a new board. Found a place in VA that
will repair it for $230 which was okay with me. However, if it fails
again, I'd like to repair it myself but would need the board
schematic. I'm a retired airline avionics tech. and have more than
enough test equipment to do that but Lincoln said the board schematic
was proprietary. The board repair facility said since they're under
contract with Lincoln for warranty repairs, they can't release the
board schematic either. The Lincoln part no. for the board is G2986-1
and I was wondering if anyone had any info on where I could get a
schematic for the board. Thanks for any help.



It looks like someone has schematics. Maybe chase them up:

http://weldingweb.com/showthread.php?515221-Lincoln-Square-Wave-175-TIG-Control-Board-issue



Not schematics but a wiring diag. Might help a little. You've likley
already found this.

http://www.lincolnelectric.com/assets/servicenavigator-public/LINCOLN3/im687.pdf