I have been fixing Sony car stereos for some time and have learned a lot.
One thing I need help getting information on is how to troubleshoot the CD
drives.

I have purchased the "repair manual" but it is mostly schematics.

Currently I have a unit that spins up the CD, fails to read, stops, starts
again before it reads the directory. I have cleaned and adjusted the read
head but have no idea of where to go next. Anyone know of a source for a
troubleshooting guide?