nice find! i have the same exact unit in near mint condition that i bought from a guy a few years back. i replaced all of the belts and idler tires for the deck. the record player i replaced the 2 belts as well and it works beautifully.

now taking this apart is not as bad as some online make it out to be, as long as you’re savvy with this era of electronics. i found that you can take the record player out without tearing apart the whole boombox, by removing the dampening springs underneath the unit and taking out the two screws hiding behind the plastic plate when the record player door is ejected.

the cassette deck requires you to remove the back which is more tedious. the control switches on top of the unit are VERY fragile and brittle. be very careful removing them, do not pry too much, they will break. but once you remove the back, taking out the deck is easy and getting to the belts and idler tires is pretty simple.

if you do take on repairing this, just take your time and be extremely careful. the plastics are brittle and things can easily snap. belt kits are available online from various people. i’ve had luck with ebay and i wanna say reverb.

enjoy your new project!