I have been servicing Olympus OM since 1977 and am factory trained on most models. I'd be happy to repair your OM-4 if you'd like to send it to me. Please visit my website for further information. www.zuiko.com
Replacing the circuit really isn't viable anymore. IF the part was available, net would be approx. $250 just for the circuit, then add 2-3 hours labor and you're at the price of a used 4T.
Originally Posted by Canuck