[Elecraft] Fw: "Hung" Auxbus? --- Addendum

[William M. Spaulding, Sr.]

Another clue is that the 5V regulator on the control board gets really hot.
I measured the loading on the RF board at 67 ohms.  I can't seem to figure
out where the 5A volts goes on the RF board.  Does it relate to the "RYCOM"
tag?  Is a relay coil stuck "on"?

Thanks again for any help.

Bill
NA7Y


----- Original Message ----- 
From: "William M. Spaulding, Sr." <billspau@att.net>
To: "Elecraft Reflector" <elecraft@mailman.qth.net>
Sent: Saturday, February 21, 2004 6:18 PM
Subject: "Hung" Auxbus?


> Dear Elecrafters,
>
> A while ago after making some A to B mods, I turned on the K2 to the blast
> of white smoke from the lower from corner.  From all I could tell
initially,
> the only thing I could find wrong was that the inline fuse from my supply
> had blown (5 amp fuse).  When I applied power the second time, nothing
> happened.  Using the front panel and control board from another K2, all
> turned on, but it acts as if there is a key being held down.  But it has
> nothing to do with the keyboard and controller.  Something on the RF board
> is making the MCU believe that a key id pressed and is waiting for it to
be
> released.  When you turn the radio on, it shows the software revision just
> as if a key was being held down.  But the source of the problem is on the
RF
> board.  I have removed all options and replaced jumpers.
>
> Anyone got a clue.  I tried swapping a known good RF board I/O controller.
> Any clues.  I am a long ways from an AuxBus "driver"! ;-))
>
> Thanks for any help,
>
> Bill
> NA7Y
>
>
>