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Mend Sony STR-K840P Audio System

How can I fix my sony AUDIO RECEIVER SURROUND STEREO SYSTEM STR-K840P ?

I KEEP GETING THE MESSAGE PROTECT WHEN I TURN ON SURROUND SYSTEM.

MICHAEL
October 2009
SonySony STR-K840PVideo, DVD PlayersSony Audio System

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Sony STR-K840P Protect Error - Fix & Troubleshooting