Arfa:

Thanks for the helpful information.

All I know at this stage is that the CD will not spin under any
condition...HOWEVER, when you turn the power off, the CD will spin
maybe a quarter of a turn while the unit is powering down.

And here's a strange fact: The other day I started messing with the
player after having it sit for a couple of weeks. I switched it on
and inserted a disc. Quite unexpectedly, it spun the disc and the
disc's track information appeared in the digital readout window!

At that point I should have pressed "play" to see what would happen,
but I ejected the disc and re-inserted it. Back to square one--the
disc didn't move.

This has been the one and only time the player has ever spun a disc
since I acquired it.

I have measured the voltage coming off of the four-transistor bridge.
Whenever a disc is inserted, the necessary 5 volts appears for a MICRO-
second, and then the voltage goes back to zero.