Hi Katie

here is the service manual
Its pretty simple stuff any tv repairman should be good with

I had a few problems with my system
the fan running on seemed to be fixed by changing the thermal cutout in the head
but I also changed the controller to a RH design analyser 500 at the same time so it could of been fine

Richard at RH design is still making "stop clock 500" and "analyser 500" for these systems so might be worth an email as to if the controller runs the fan or not

the RH designs units are f stop timers and work very well indeed
i changed my ilford controller out as the touch membrane buttons were becoming unreliable but I would never go back to using the ilford controller now