Portavision-5

[tiv48]

if its a standard regulator there should be 12 volt on the base pin there will be a resistor from the emiter to the base of about 680 ohms and a 12 volt zenner from the base to neg line ,it could be the resistor is open circuit and maybe the zenner short circuit

rob t

[tiv48]

just found this on the net
rob t

[Joe]

Thanks, Rob. I've just been doing a fencing job for my mate so will investigate further when I've got my breath back and had my tea.

- Joe