Got last week a new Mini. It's the biggest, I have in my small collection and the one with extravagant design - Pioneer SK-606L. It came in quite good optical condition, needed just some cleaning. Most of the tape operation buttons had a brocken lock screw or it broke during first operation. This are tiny pieces of plastic, where it is clear, that they will break. I replaced them with metal screws. The tape mechanism needed some cleaning, because it often got stuck during opration. Probably cured grease. During my work I installed an LED illumination for the cassette deck. Now it runs very well and for a 37 years old boombox it sounds quite nice.
Pioneer's are great, I just picked up a SK-210 that's in the beer and boombox thread. I think your model is a little more rare with it's digital clock, I don't remember seeing that feature before or the "editor" button, what does that do? It looks like your also has that big beefy antenna that when folded ends up inside the body of the box, a great feature on some of these models.