"n cook" writes:

What control signal to the main CD micro would disable spinner drive.
Taking the I/P H(ish) of the releavant 1/4 of the BA6398 quad motor driver
gets the motor spinning.
Taking the I/P L(ish) of the isolated inv buffer on the BA6398 also fires it
up.
The signal line to this buffer from pin 25 of the CXD2503 main micro is not
going negative of mid V neutral.
Focus/tracker coils hunt and sled motor moves on power up but no spinner.
Both limit switches function

Component CD players won't spin the disc if there is no focus lock due
to dirt, weak or dead laser, etc. If the focus coil hunts but doesn't
stop, there may be no motor drive.

See the CD player repair guid.

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