There is a manual for SX-255R receiver:
Here you can find solutions of some stereo receivers' problems:
Also you can take a look on documentation about testing of receivers:
Hope it is something that can help you
iRidium mobile Ltd.
I have a pioneer receiver SX-255R and when I plug the receiver in, the red light comes on but no functions or lights of the receiver work. I am trying to learn how to fix up receivers my self so because I have a couple not working. I am looking for any advice with this particular pioneer receiver problem, but also would love any good websites or literature explaining how to troubleshoot stereo receivers and how to fix them. Any advice would be great!