Sony SA3ES tuner display not working

[marc.mc]

I would very grateful for any information or diagrams regarding the SONY SA3ES tuner. The unit itself is working however I dont know what station I am listening to as there is no display.

Thanks in advance

[marc.mc]

Just to add, the tuner is actually an ST-SA3ES, none of the lights work on the front of the unit either. I suspect a power supply problem but without diagrams have no idea where to start checking.

Thanks again.