If anyone has found a way to repair or replace the mirror, I hope they will share the knowledge.
The two mirror mounting lugs appear to be glued to the aluminium beam that forms the backbone of the projector optical system, and I am not sure how to adjust the screws that set the angle of the mirror. When I have a projector with a damaged mirror I strip it down for parts to repair projectors with other faults.
Thank you, Shane. It is nice to know the guide is appreciated. I wrote the guide when I was quoted £800 to repair one of our school projectors. Instead of paying I started buying second hand projectors, so I had nothing to lose from cannibalising the broken ones. Writing a guide helped me record the details to ensure I could put them back together!
With practice it gets easier to remove the case. They are quite strong. After removing ALL the screws I just pull hard at the opening for the bulb and I have not yet broken a case. Just remember to also remove the two screws hidden under the bulb cover.
The documents I have found suggest that the DMD chips are not compatible. Here is a list of projectors that are compatible with the UF75 DMD chip: https://www.replaceyourlamp.co.uk/projec... and a different list of projectors compatible with the UF55 DMD chip: https://www.replaceyourlamp.co.uk/projec...
The lamps are different: the UF75 lamp is 230 watt but the UF65 lamp is 200 watt and the housings look slightly different.
I don’t know about the colour wheel compatibility.