Batboard

A client's Maxtrac300 was brought for re-programming, working OK.
After several attempts to program, I found that a transistor was blown in the SCI line.
The transistor (Q109?) was replaced and the radio resumed and re-programmed.
The radio was reprogrammed with the original codeplug, frequency modified.
Now after the initial beep, a second ,same pitched, beep is heard, the display blinks and it refuses to PTT with an error beep. I checked the head for stuck keys, but it was OK.

Any suggestions?

Try going into the alignment screens, make a small adjustment, and exit out properly. Sometimes I've seen this fix strange problems like what you describe.