Thanks for everyone's responses. I swapped out the regulator with one
from a spare radio and the problem went away. I could not see any
physical problem/damage to the one I removed, but the one I replaced it
with seems to work fine. My guess is the lead was broken inside the
to-220 case somewhere.
--
Terry
KE4PJW
Terry wrote:
> Hey folks,
> I kinda of have a strange problem on my UHF Master II mobile. The 10V
> regulator seems to have a strange mechanical failure of some type. It
> appears to have intermittent operation when I apply pressure to it. (It
> is internitant on it's own, but pressing on the case seems to let me put
> it in either a on or off state.) Suspecting a cold solder joint, I
> reflowed the solder on the bottom of the board to make sure that the
> leads have a good connection, but it still is flakey. My questions are
> as follows.
>
> Are there any other components or connections I should be looking at in
> the radio?
>
> Could the bad connection be inside the case of the regulator?
>
> I just want to make sure that I get the problem fixed and sometimes the
> obvious failure, isn't.
>
> Thanks in advance for your guidance and advice.
>
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