Alert light in f4 is apearing

I too had this problem. I had owned the F4s from new but only lightly used it. A single shot only then the red light flashing. Nothing I tried corrected this inc changing batteries, resetting DX / ASA setting etc. Even opening the camera back to ensure the film was feeding (one cause) and finally running an old film through on the fastest drive speed. Eventually I had to take the camera to a Nikon repair agent who charged me £230. On the first shot when I got it back the same happened. Naturally it went straight back and they kept it for another 3 weeks. I now have it back and it's OK (so far). I still did not get a satisfactory answer to what was wrong but I was told the top and bottom drives had been rebuilt. Sorry this is not a quick fix but I don't think there is one. to hThere is nothing in any of the books or manuals to help or even mention it. best wishes Brian

YEH IF YOU SWITCH THE CAMERA OFF AND TURN THE ASA DIAL FROM THE BOTTOM OF THE RANGE TO THE TOP AND THEN SET THE ASA YOU REQUIRE IT STOPS THE PROBLEM WHEN I HAD FINISHED SHOOTING I GAVE THE ASA DAIL A GOOD CLEAN USEING METHS AND FINGERS CROSSED HAVE NOT HAD THE PROBLEM SINCE

I took my F4 to the official agent in Spain, Finicon, and they said the shooter is damaged and they can't repair it because Nikon don't provide spares... Later I took it to Arpi, a important agent in Barcelona with the same result... After a year I couldn't solve the problem.

One thing to check is the ASA setting. Without film and the ASA set to 'DX' will get you a blinking red light