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Replacing belts, It’s not difficult, fairly straightforward process.Those speakers 🔊 come right off as you already know. Take plenty of cellphone photos, write down some notes. You’ll need some 99% isopropyl alcohol for cleaning and some q-tips that don’t shed so badly and you’ll need a lot of them. Some disposable gloves, a really good light source. And you’ll need some belts, just get a multi pack and try several different ones till you find the right size. I’ve used this one, works fine for most occasions. https://www.amazon.com/dp/B0CZ4549WNLook on YouTube for your model or something similar.
Not embarrassing if you want truly want help.From what I just saw and heard in your video which was helpful. More than likely, it’s belts. You’ll need to disassemble, and replace the belt(s) and the belt path will need a good cleaning 🧼 too.This may be your belt https://www.turntableneedles.com/general-electric-model-7-4956b-square-drive-belt-sbo6.6-g.e.-7-4956b some models do use a longer belt. You could also just go with this multi pack set of belts and match it. Not too tight, not too loose. Just a little bit of stretch. https://www.amazon.com/dp/B0CZ4549WN Here is a how to https://youtu.be/_sjaTkWUX3s
Could…Just don’t know exactly what size you actually need. There lies the next problem finding the correct size belt, or belts. May just be easier to buy a bulk pack and find one or two that serves your purpose. I have used this pack before and these have worked well for me. https://www.amazon.com/dp/B0CZ4549WNI can recommend using 99% isopropyl alcohol for cleaning the old belt residue and q tips, lots of q tips. Some disposable gloves. Lots of cellphone photos and write down some notes. It’s usually pretty simple, and can be frustrating. Just take your time. See if you can find a YouTube video for your particular model.
More than likely you aren’t going to find any good references anywhere. Best practice is a piece of string and measure it yourself.More than likely you’ll need to buy a multi piece kit. And many different ones till you find one that fits just right. This is actually a pretty good assortment https://www.amazon.com/dp/B0CZ4549WN Measure the Belt Path: Take a piece of non-stretchable string and wrap it around the motor pulley and the flywheel.Calculate the Size: Mark where the string overlaps, measure the length flat (this is your circumference), and subtract 6% to compensate for the rubber stretch that happened over time.
This is the service manual for it. Link 🔗 https://documents.cdn.ifixit.com/eVxjPkDbVwlKR3bC.pdf It more than likely just needs some TLC! A good cleaning 🧼 and relubrication. Use 91-99% isopropyl alcohol for the cleaning, especially the (tape path) use a good quality synthetic sewing machine or clock oil. The grinding noise could be coming from so many different places motor, capstan, pinch roller, tape take up wheels. You’ll have to sleuth that one out. Here are some guides for your boombox Link 🔗 https://www.ifixit.com/Device/Sony_Radio_CD_player_and_cassette_player_CFD-S05 You should replace the belts on the cassette player once you have it opened up. You’ll have to find a replacement for it. You can try an Amazon multi pack for the replacement. Your belt is a square cut belt, I’m not sure of the exact length. It will be some trial and error. Belts are very difficult to source and most are made in China anyway. I can recommend this oil because I’ve used this to lubricate cassette deck, boomboxes and Walkman https://www.amazon.com/dp/B00AZMGFI4 I’ve also used these belts https://www.amazon.com/dp/B0CZ4549WN You only need two belts for your boombox surely you’ll find a suitable match out of this bunch. Lottsa luck 🍀 with your repair! Take a lot of pictures! And write down some notes 📝