I think it is in the trouble shooting section of the manual, but I didn't have that section in the computer version I got some time back. Lynn said he'd send me an updated manual and I think this has the trouble shooting stuff. That sure would have saved me a lot of frustrtion. Basicly, opnce you get the hang of it, it is a real cool radio for the blind. 73s Butch Bussen wa0vjr