In article ,
"Mark D. Zacharias" wrote:

Sometimes if it uses a belt, the belt may be too tight - this will load down
a motor. Perhaps someone replaced the belt?

Thanks for your advice, Mark. Actually there's no belt, it's a worm gear turning a plastic gear which turns the platter.

Or maybe a different mech problem. A wormscrew gear may have travelled on a
shaft. This could put a load on the motor as it tries to turn the gears.
Could be a lubrication problem somewhere in there too.

Everything is well greased, and I took the worm gear off the shaft and put it back. It runs freely when it's not engaged with the plastic gear, which itself turns freely and is well lubricated.

I think the motor itself is probably OK. Measure the resistance again as you
slowly turn the motor shaft. The resistance will vary as you turn of course,
but will settle down when you stop. Should never vary much from the 12 or
ohms when at rest, certainly never shorted or open.

Good tip, thanks for that. The motor looks good inside and the brushes are well engaged with the spindle.

Thanks again,

MK.