hifi engine

Yamaha R-N301 service manual

Hello everybody,

I need to repair Yamaha R-N301 stereo receiver. It has standby led flashing all the time, pressing the power button does not turn it on. But if I hold Preset button (either < or >) and plug the cord to electrical outlet, it starts and tries to download firmware - LCD display works and relay clicks. It does error out eventually since there is no USB port.

Output transistors appears to be good, so I need schematics. Anybody has it?

Thanks in advance.