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The word protect will engage when you have output problem and will shut the audio off so no sound is available, however if the sound is working normally with protect visible then there is clearly processor issue, something I have never seen before. But it should be checked by a qualified tech.
Make sure the unit is on. Press the FM Mode /Mute -Demo button (right next to the power) press it untill you get to either mono or auto (-for stereo). That will take the unit out of the demo mode. next turn the music jog dial (located just above the preset buttons) untill you get to which ever setting you choose. Hope that helps. ( I can't find the manual on line either- not even from JVC! )
There was a black wire included (with a metal "cap" to insert in the FM center connector) that served as the FM antenna, but in a pinch any wire can do, preferably about 33" long and with the insulation stripped from the last inch or so (or get creative and sand the last inch of varnish off a properly sized untwisted clothes hanger and gently bend to suit). Bare stranded wire should be twisted or folded until it's thick enough to firmly fit the middle "hole" of the FM antenna connector. Be careful that no strands of wire short to the metal ground "ring" surrounding the hole or the antenna won't work (although it won't burn out your amp like shorting the speaker wires would, it just won't work). Orient the wire horizontally or vertically for best reception. This unit also doesn't pick up FM very well if you're in a steel-framed building or away from windows in the general direction of the local transmitters, so moving the unit closer to a window may help dramatically. In bad reception areas you can get an external FM "rabbit ears" type antenna but you'll need the "European" style of 300 ohm to 75 ohm transformer to plug it into the unit's FM connector (one that has a bigger central connector "plug" than the usual US units). Some cable systems also still support FM, if yours does, a VHF/UHF/FM signal splitter and either the above mentioned transformer attached to flat 300 ohm cable or a plain "European" style connector attached to the end of the 75 ohm round black cable will do the trick. Some Radio Shacks have them. Good luck!
Does FM work? If so, I would expect AM to work also. Old AM circuits are pretty resilient. If you rotate the tuning dial in AM mode, can you hear distinct changes in the sound (noise) coming from the speaker(s)? I'm thinking there's no wire attached to the AM antenna on the back. Without the antenna, you might not get any audio output.
We had trouble switching from AM to FM. We finally solved the problem by pushing the reset button on the back of the unit (any sharp pointed object can be used to engage the reset button). Do this followed by setting the mode to FM and try tuning in your FM stations. Try the procedure several times and it may finally kick in, as was the case with us getting our AM stations