Any chance anyone has a pic of the circuit diagram for this tuner?

It won't turn on at all and I suspect a power supply problem, but am having trouble tracing it.

Thanks,
Jerry

Remove the fuse and see if the transformer is working properly. Then you can go from there or put it on the shelf.

If this is a KT-7500 you should have 15V from both small red wires to small black wire out of the transformer.