I have a mk4 nav that keeps reseting itself after around 13 seconds, I've searched the forum and cant find anyone else who has had the same problem, the light on the nav comes on, it spins the disc, the light flashes then stops spinning the disc then the light goes out, then the cycle starts over again.
I've tried to load various OS discs to no avail, I've tried the OS discs in a mk3 unit I have and they all work in it. I have Navcoder and the only communication from the Nav is between Nav and Rad and its every 13-14 seconds saying Nav ready after reset, it seems to be stuck in a loop of switching on then resetting, the laser has also been replaced with no effect, tried the usual battery disconnect also.
Any ideas? Was thinking of buying a new drive mechanism to see if this would help?