I haven't touched the drive. That's got to be
the place to do any
effective testing.
If it's any help, the drive I have the docs on shows a TDA8808T for the
'photo didoe signal processor' and a TDA8809T for the 'Radial Error
Processor'.If I am reading it right, it looks like the Eye pattern is on
pin 3 of the TDA8808T
-tony