I had the same problem with my PANASONIC SA-VK 550 !! the F61 error. I went crazy searching for the instructional manual but I didnt find it Until I came here . it made be known that the f61 error is realted to something to power so at that instance I started my system and carefully just tried moving the ac in put which goes to the system and to my utter disbelief it works fine now.
I recomend u removing all ur speaker and surround speaker connection as well as the radio transmitter and try putting it on ( it really starts sometimes) .if not try the above method . it should work. I better belive giving your system for repairs if none of them work
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