I found a comment under a video that helped me fix my 3 monitors, after a power outage; I would probably have never fixed it otherwise.
C223 didn't look damaged, but.
I also learned something new; electrolytic caps won't work for long on 1.8V, it's not enough voltage to keep the 'electrolytic' part good.
The buttons on the front that do the tonearm are a release for a cam, iirc, and the linkage is going to be loose, bent, or broke.
You push the button, it releases, and does the action as the cam comes around.
Lube everything first, because if something's stuck, it will break worse.
The little shaft that lifts the arm needs to be free, and easily movable.
All the little flat steel pieces are delicate, so be gentle.
It seems to me, (it's been years) if you stuff both buttons hard on something when you're moving it, it pops a clip off, and it will be laying in there somewhere, so put a white towel down, and flip it over. The towel makes the parts easy to find.
Seems like the outermost button is the one that comes off.
The only other thing I remember fixing on those was the cartrige mount; don't strip the screw, and don't break anything.
It's likely unobtanium.
Oh, and the rear RCA plugs are kinda cheesy, and the outer ring can get loose. it will hum if it does that.
I've seen one come in with the outer ring missing, and it won't work like that. They were still in his cable, as he found when he tried to plug it up.
Unless the bearings/bushings are bad, that turntable is way better than any you'll find today.
That motor was probably $30 then, it'd be $200 today.
So no one uses those, lol.
Lube, and reassembly is probably all it needs, and replace any belts; some of those had a toothed belt to switch the changer part, yours may or may not.
I don't think so, but.
Newark apparently bought MCM electronics, and you can get a wide range of parts there.
CEI used to sell belts and other ttble stuff, but IDK now.
My Technics ttble has a single button to operate it, but it doesn't have as good of a motor as the dual.
Seems like: if your tonearm is square, and this grainy looking silver metal, then it's beryllium metal, and is really lightweight.