You probably need a new belt. Did the previous owner tell you how old it was?
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It can be tricky to get the belt to sit right.
I place the belt around the platter then use a finger to put the belt on the pulley, always keeping tension on the belt so it stays put on the platter. Spin the platter by hand a few times to see if it is seated right.
Seems like you need three hands, but with practice it becomes easy.
If the belt slips to the bottom of the pulley, I remove the platter and try again
Do you have an instruction book?
I do have the manual and have followed the instructions to a "t". I've tried numerous times to seat the platter and belt but no matter why I do it seem to "want" to ride the bottom of the pulley. I've tried teasing it up with fingers and/or clean chop sticks but it eventually gravitates back to the bottom of the pulley. The top of the pulley is 71mm from the plinth as per instructions. The suspension and levelling seem perfect. Needless to say I'm getting a bit frustrated!
Thanks for all of your suggestions. I do think a phone call to oracle may be in order here...
Jacques has the power supplies for $75 plus shipping. As for the belt riding down, is this when you first put it on? it takes a bit for the platter to settle down into the oil in the bearing. I havent had any problem with my belt riding low, or even putting it on, although it does take some practice to hold the belt and platter as you lower it into the bearing well and then over the pulley.