Davis Powerbeam V - tech help

The Projector bulb starts to strike then goes out. Back panel lights up, but zoom and focus buttons do nothing. Not sure if bulb or electronics are the fault.
I am technical and would like to get a schematic and or other service information.
Can anyone help?
Thanks John

[Gary Lightfoot]

There was a place in Wandsworth that used to deal with Davis projectors but I can't remember their name now. RTFM (another forum member) might remember it so I'll ask him. Do you know how many hours on the lamp before it started playing up? Was there a lamp change warning beforehand?

Gary.