Batboard

Interesting issue here with a used 1550. It reads, writes, powers up, and receives fine. For what ever reason, once it's keyed up it refuses to dekey without powering down the radio. This happens with both the local PTT and with a speaker mic.

I'm wondering if RF is somehow getting in to the PTT circuit and causing it to stay active, as opposed to it being a button issue.

Would love to know if anyone else has seen this before, and what a fix could be. Thanks!