As far as I know the instrument software should give you one!

Dear Hugh,

I found a general scheme of optical path in user guide, but we have bigger problem with adjusting the interferometer. It is important to me to know which way laser beam should go via beamsplitter and interferometer. The KBr beamsplitter has small window. Should the laser beam go through this window to next mirror?

Do you ahve a copy of the schamatic?

I have but I don't know if i can public it (copyright 2005 perkin elmer :()

If you ever found the manual and have the schematic, I'm interested for both of them. The machine is obsolete according to PE, so it's shame they're not archived in f.ex archive.org.