Yamaha G100 and Yamaha G50 amps

[frabarmus]

Best sounding amp I've ever owned was Yamaha T100C

[Mattmed]

Hi guys I'm stoked to have found this thread there is next to nothing in these anywhere else. I just picked up a fifty410 series 1 for free. The guy had it listed at 100 but I talked him down to 50 and then he ended up just letting me have it. I got it home and it has power. None of the speakers were connected to I hooked them all up. When I turn on the power the speakers move but when I plug in a guitar I get no sound. anyone have any idea what it could be? There are a couple empty spots where wires might have been at some point but I can't findna wiring diagram anyehre to be sure any help y'all could give me would surely be appreciated thanks!