[Sean]

David,

Here is information on how to test the photo cell:

http://www.philcorepairbench.com/phono.htm

The rubber mounts for the mirror and needle assembly may be dried and hindering movement. I replaced the mounts in my 1942 changer by cutting strips from a rubber glove and wrapping them around the shaft where the original mounts were located. I used Syl's writeup for guidance. You will have to measure the clearance between the shaft and the bracket that holds it all to the head and then figure out how many turns of the rubber you need to apply. I would start with checking the photo cell first to make sure it is up to snuff.