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Re: [TenTec] Off Topic

To: tentec@contesting.com
Subject: Re: [TenTec] Off Topic
From: Stuart Rohre <Rohre@arlut.utexas.edu>
Reply-to: Discussion of Ten-Tec Equipment <tentec@contesting.com>
Date: Wed, 23 May 2018 16:43:22 -0500
List-post: <mailto:tentec@contesting.com>
There was a ham in DFW area well regarded on Kenwood repairs. Not sure he is still active.

Service manual for 850 is on internet, has schematics and assembly drawings and photos.

The problem you have is probably bad
asian built electrolytic capacitors on the voltage bus for the display board. I am not sure if these are on the display board or on one of the other boards. See service manual.

Some bypassing was done with parallel bus caps, and both of the failing caps need to be replaced at same time. if originals were rated 15 volts put in 25 volt new ones The originals may have electrolytic leaks, or swollen cases or ends. Clean any electrolytic leaks immediately upon finding them or they could corrode and loosen the copper traces. Peeled copper traces can be replaced with short lengths of tinned no. 26 solid telephone frame wire jumpers. Run the wire to a pad of the same trace and use clean iron tip, wet sponge wiper, and quality tin/lead solder of thin diameter, close to that of the copper jumper. insulate the wire.

Don't use too hot an iron. 15 watts iron, cleanly soldered, should work.
If soldering in a copper run, scrape the coating from the copper trace
before soldering. Get the copper bright, then tin it.
GL, we just revitalized three shorted electro. caps on the club 850 here, at W5KA, by replacement.

-Stuart Rohre
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