Found out why so much dust on the bulb reflector - breakdown product of the
chop-strand fibre reinforcement (asbestos?) making up the high temperature
plastic surround to the lamp combined with nicotine as sticky agent.

To get some more hours out of the bulb, ie defeat the counted-out lifespan
of the bulb its a matter of pressing both volume switches on the switch
panel for 10 seconds , so full drive resumed to the colour wheel. lamp drive
and all else. Rewinding the 3 primary coils of the inverter transformer
worked, so now reliable startup now the control from the video board is
resumed.

Now a matter of sticking those fiddly 4 bits of light tunnel together.
Will bend back the part of the spring plate that holds the one of the
vertical bits of mirror in place and just rely on the top force to hold all
4 together, in its cradle, if/when the superglue fails due to the heat. That
way there will be no sideways pressure to push in the side piece and so stop
down the light tunnel.

--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/