On Wed, 24 Sep 2003 21:17:48 +0000, Nick wrote:

My mothers friend wants me to try and fix a older Bearcat scanner
model 250 that shuts down after being on about 20 minutes. After the
cool down it seems fine. Everything works well otherwise. What to look
and change for myself help is appreciated. Nick

If the circuit breaker inside the power transformer was bad,
the scanner would be dead and stay dead.

Based on your description, I would first replace Q204, a TIP29
transistor located on the Feature board. When you install
a new one, install some type of heat sink to the tab to prevent
the replacement from overheating. I sometimes homebrew a
small heat sink from 2 solder lugs and fastening them
to the tab using a screw, lockwasher, and nut.
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Bob Parnass, AJ9S GNU/Linux User http://parnass.com