The counter, display driver, and keyer are all done by a 68C05 on the
display board. It fails when the electrolytics go bad. It can also fail
from loosing power from a dirty board connection. It doesn't control any
of the radio, so everything else will work without the display, just you
don't know easily here you are tuned. History says replacing the
electrolytic or two on that board usually fixes it. Order up the lowest
ESR, highest temperature rated one from Mouser or Digi-Key to get the
longest life.
73, Jerry, K0CQ
On 1/20/2011 1:31 PM, Don Rasmussen wrote:
> Hi Guys,
>
> The Corsair II that I used yesterday for a CW QSO today powered up with only
> the decimal point on the display showing.
>
> And the internal keyer does not work. (Bencher paddles).
>
> Aside from that, the radios tunes and operates nicely.
>
> Any suggestions - common experiences?
>
> Thanks,
> Don
>
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