Tac-3 going right+up

[cirenala]

Picked up a Suncom Tac-3 at the thrift.

on DK Mario automatically goes right. if i pull left he will go left but will not stand still.

on Pac-man Pac goes up and right.

 

Is there any way to fix?

[Video]

Almost sounds like the switch has been crushed. I don't remember if those use micro switches or not, if so, you can replace it and likely fix the issue. If it's a dome or leaf spring, you might can pop it back in place, maybe wedge it in the open position with a bit of foam (or some other non conductive springy material) but that's only really going to prolong the controllers deterioration, as well as potentially causing other problems.

[Rockin' Kat]

If it's anything like my Tac-2 or slik-stik, it's not micro switches... the stick is attached to a metal ball, which is then pushed against a big metal contact for each direction The fire button is probably on a big spring and has a washer on it which closes a connection between two points when pressed down.

 

When I got my Tac-2 the fire buttons weren't working well, but I was able to use a deoxidizer on them.

 

Here is a crappy web-cam shot of a SunCom Slik Stik opened up.