One major problem with these motors is that the AN620 IC chip can go bad, which will result in speed issues as well. Luckily you can find the AN620 on eBay for around $25 plus shipping. Leaky capacitors can damage this chip, so even if your turntable is working, you should still recap it.
This kit includes replacements for all 7 electrolytic and tantalum capacitors on the motor boards. These are extremely high-quality parts, the same ones I use when I work on vintage stereo gear. Capacitors are Supertech axial electrolytic caps, one Wima film cap, and one radial Nichicon KL cap.
I will include surprisingly well-written instructions, but this is moderately complicated, and you should know what you're doing and have a decent soldering iron. The motor board is HARD to access on these.
Please see my pictures for details.
US shipping and handling is $5, and international is $18, no matter what quantity you buy. All my small parts are set up for combined shipping, so just use the "add to cart" feature and then check out all at once, and it will combine shipping. If you have any questions, please ask.
Looking for more parts? I have power switches, feet, pushbuttons, top case screws, bottom screws, faceplate screws, white LED fuse lamps, blue LED fuse lamps, 6.3v bi-pin bulbs, 8v bi-pin bulbs, 12v bi-pin bulbs, wired 8v 60ma bulbs, new power cords, new main capacitors for the Marantz 1060/2230, wired Pioneer speaker plug replacements, new 630v yellow film capacitors at 38 different values, new 1200v yellow film capacitors at 15 values, a large variety of transistors for vintage stereo repair, new Wima film capacitors for stereo repair, new 250v yellow film crossover capacitors, and more. Just use "add to cart" on everything you want and then check out for combined shipping.