Unitron TMS-2308 Tool Makers microscope.

I just bought a used Unitron TMS-2309 Tool Makers microscope on
eBay. It seems to have a problem. The microscope has a photo tube
and the regular angled eyepiece tube. I can get light into the photo
tube section but I can't seem to get any light into the visual
eyepiece tube. It has a control knob for this but after adjusting it
to switch tubes I still can't get light into the eyepiece section.
Any idea what is happening???? Has anyone got a schematic or blow up
image of this microscope or know where i can get a handbook for it?
If you can help please email me at: epmajden@xxxxxxx
Thanks:
Ed

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