[Elecraft] KAT100 no relays switching

Mon Jun 30 22:22:01 2003

On Sun, Jun 29, 2003 at 11:38:00AM -0500, k4zm wrote:
> Ken:
> 
> I would check the voltage on the pins of the 7805 5 volt regulator.  (Left
> pin should have 12 volts and the right should have 5 volts.) If the 12 volts
> is not there you want have any 5 volts either. Make sure you are getting 5
> volts to pin 2 of U2, U3 and U4, and make sure that you can measure 12 volts
> on either side of RFC2.  If you see the menu items it means the K2 is
> communicating with the KAT-100 on the AUX BUS line.  You will hear the
> relays when they operate because they are noisy.  I have just finished
> building two of the KPA100's and had no problem with them.

In the process of trying to take this measurement, I seem to have accidentally
shorted the center and 12V pins of U8, and instantly the LEDs that were on went 
blank.  Ack!  What did I fry?  I didn't blow the 1A fuse in the power cable...

Also, trying to figure things out, I checked the voltage at the power cable
(12.4 VDC) and at J1 (where it seems to read 4.0 VDC.)  Does that seem right?

> 73 & GL
> Jim Younce K4ZM
> 
> 

-- 
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Kenneth E. Harker      "Vox Clamantis in Deserto"      [email protected]
University of Texas at Austin                   Amateur Radio Callsign: WM5R
Department of the Computer Sciences          Central Texas DX & Contest Club
Taylor Hall TAY 2.124                         Maintainer of Linux on Laptops
Austin, TX 78712-1188 USA            http://www.cs.utexas.edu/users/kharker/
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