I just purchased an Adcom GTP-750 Pre/Tuner. The owner disclosed that it may have issues and wanted 40 bucks for it. It had the remote so I thought I'd take a chance. Surprise! It turns out that its nothing simple like a fuse or some noticeable damage to the power supply. After taking the cover off and poking around everything looks connected. The caps all look good. Nothing hums loud. Nothing obvious.
When I plug it in and turn it on, the amber light on the power button comes on and stays on. I get no display and none of the buttons seem to work. The remote also does not seem to make any change to the system. I have not tried to connect a source to it and plug it into my amp.
Can anybody help me with what to try next?