Is there schematics for the 130 GTS ? i looked on google only found user manual. I bought this unit for a decient price it works fine for stick but Tig is not maintaining arc it just starts an arc then nothing in HF mode i have not tried it in lift mode yet. If i try to touch the plate to force an arc i can here somting inside like arching, however i opened it up and i cannot find any burns. Im going to fire it up with covers off next to see maybe with lights off if any arc or just normal sound. Any input would be great. The inside of this unit looks brand new not a spec of dust like it came out of a box really odd for this old unit.