What I remember is they have boarded a long abandoned ship on a planet and they have a robot with them. The robot is a midget with a face like C3PO but no eyes. There is a robot of the same type that was left on the ship to guard it. They set their robot to sentry mode(?) and send him after the other robot.
I believe they are trying to use the old ship to escape. I think the ship had been there for 100 years? The original pilots grandsons help is enlisted to get the ship running but I don't think he had every seen it before.
I am guessing it was an 80s straight to VHS movie as I believe I saw it as a rental in the late 80s possibly early 90s in Canada.
I have gone through many lists of scifi movies in this time frame but can't seem to find it.