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[TenTec] Herc II and 9420 problem

To: <tmacon@wi.rr.com>
Subject: [TenTec] Herc II and 9420 problem
From: "Harry Coates" <WA8HC1@charter.net>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Sun, 2 Nov 2008 16:14:32 -0500
List-post: <tentec@contesting.com">mailto:tentec@contesting.com>

I had problems like that also for along time, usually happened when I apporched 
200+ watts output.. Ended up replacing pass transistors in 1 9420 ps unit.. 
Than found a bad solder joint on one of the big shunt resistors on the power 
dist board.. Start at the power connector and work to the amp boards checking 
voltages at each one.. Do a little tug and wiggle on "EVERY" component lead you 
can get at.. If it moves look again..  I ended up replaceing all 8 power 
transistors and found 5 more bad solder joints..

The HERC II is worth anything it takes to fix.. 


Harry Coates
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