It's all fixed !!
I contacted Orion who told me it couldn't be fixed (even without looking at it !!!).
They wouldn't supply me with a wiring diagram nor would they tell me who the manufacturer was so I could maybe get a wiring diagram from them.
Orion were less than helpful. Probably in the hope I'd buy a new camera from them. When I get another camera (or any other equipment for that matter), I will make sure that it's not Orion. Their customer service is disgusting.
Anyhoo, I digress.
I took the camera apart and found that one of the chips looked a little cooked. So I posted a message on the Orion DSI Yahoo group in the hope that somebody could tell me what type of chip it was and I got a result.
I managed to find one on eBay (US$20) and Theo from Gama Electronics (
http://www.gamaelectronics.com.au) fitted it for me last night. The camera is now as good as new again (despite not being fixable according to Orion).
Theo, you are a legend. Love our work.