I have seen this problem many times.
If you are comfortable with soldering, try replacing the drive IC. This solves the problem 90% of the time. The part number is: AN6675 . This is a discontinued part so you may have to search around a bit, but you can usually find one of them on eBay for between $25 - $40. There are a few newer versions of the chip that are suggested as replacements, but most of them have been on back order for years and you could end up waiting forever. I'd stick with the OEM part number on eBay. Just be sure it is in stock before you buy.
If you are not comfortable with delicate soldering or want a fix that is easy and 100% sure to work, I suggest replacing the whole motor board. This may sound extreme but it's really not. These are discontinued as well, but are usually easy to find on eBay. I've purchased many of these for less than $115. That may seem expensive at first, but it is still way cheaper than the $300 - $400 price a repair shop will charge. Be sure to purchase from a reputable seller with good history and, be sure that it is in good working order. Some are not, so carefully check the description. Some may look a little different than yours due to minor changes over the years, but as long as it is listed as compatible with the MK2 series, it will work fine. This is the most fool proof option if you don't mind the price. Like I said before, it is super easy and always works.
If anyone else is having trouble with a Technics SL1200/1210 MK2, this link is a must have:
I used this page again and again to save time identifying problems. Extremely useful. Good luck. EW
I’m happy to help further over the phone at https://www.6ya.com/expert/erik_149c4c1c216e42f2