just splashed out on a 504 with dichromat head. Lovely enlarger apart from the minor fact that I can't get the light on!
The lamp is OK, just thought I'd get that suggestion out of the way first.
The transtab makes plenty of buzzing noises and when I switch it in the fan starts and lights come on behind the filter settings windows, so it is gettingt power and the fuse is OK. When I throw the "focus" switch I don't get the main light on, neither do I get 24v inside the head. Before I start taking it all to bits, does the transtab need a timer plugged into the 8 way socket before anything works, or should the lamp come on regardless?
If this is the case does anyone have a circuit for the timer plug. Or better still a circuit diagram for a transtab?