Hi, just came across this thread. I have a similar issue to the OP, except mine only plays at 45 speed (As of today). Up until now, it's been fine apart from the occaisonal attempt where it would play really fast.
I've taken it apart today and tried to get an idea what's wrong, and i have been searching through tonnes of posts online, but it's still failing to play at 33 speed. I'm pretty sure it's the same model, Beogram 1500:
Anyway, i'm going to get a pic of what it looks like inside. Any help after that would be much appreciated!
Edit: My post had to be checked by a moderator before it appeared. In that time i took it apart again, but after a while of looking underneath while pressing the button, eventually it started playing normally. Although i still can't see what made a difference. Was just doing the following..
Press 33 speed, wait to see if it's playing too fast, press stop.
Repeat over and over til it worked.
Anyway, somethings playing up, i imagine it'll stop working again soon. I didn't get a photo as typically my camera stopped working also.
I will sort a photo out somehow and add it to this thread sometime soon.