Greetings, I am looking for a service manual for my Yamaha CD-2 Compact
Disk Player. It has problems tracking "some" CDs on the inner tracks,
and in one case, not seeing the disk at all. It boils down to the
output level being low from the laser on the inner track (disk opacity
is affecting this). Adjusting the tracking gain has helped but I would
like schematics so I can increase the gain on the laser output
amplifier.

I have ruled out all mechanical issues. On one of my CDs the output
from the laser is 900mv on the inner track and as high as 2v on the
outer tracks. On one CD in particular (Headpins Turn it loud) the inner
track output is 400-500mv and 1.5v on the outer track. Once the output
drops below 500mv the player cannot tell if there is a disk loaded when
it tries to read the TOC (table of contense) information.

Thanks for reading...


Craig