[Racal] Ra6790 repairs

[mikea]

On Sun, Mar 12, 2006 at 02:31:33PM -0600, tfrobase wrote:
> I have had an intermittent problem with my 6790 for a while.  Poor sync and
> a lot of noise on anything that required cw including SSB and then last week
> the tuning encoder quit.
> 
> I found a bad LM339 in the encoder circuit, took the front panel apart
> replaced the chip, put all back together and it still didn't work.  Tore it
> apart again and then I triggered the scope from the encoder buffer to the
> processor buss and found the cmos buffer was also bad.  Once I had that
> fixed my intermittent problem kicked it, I found it was a noisy pot on the
> 723 regulator on the A7 board, go figure.  Back in the console working like
> a champ.  Food for though for others ... 73, tom N3LLL

Good to know. Have you thought about sending that info to the Premium-RX
list as well? There are more than a few 6790 owners on that list. 

73, de

-- 
Mike Andrews, W5EGO
mikea at mikea.ath.cx
Tired old sysadmin