K2 Display OTS - Request Advice . . . . .

[Edward A. Dauer]

The display on my K2 (S/N 7637) just quit.  The backlight is on, but not a single digit component appears.

The rig has been working FB for over a year.  Used it today as the alignment receiver for another K2 being built.  All was fine when that process started, both rigs worked as they should, and then the display on 7637 just went blank.  Illuminated, but blank..

Hard to tell if anything else was affected since without any display information at all I don’t know what the rig is doing or what mode it’s in.

Any suggestions about where I should start?

Thanks, as always . . .

Ted, KN1CBR


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[Don Wilhelm]

Ted,

A blank display is quite unusual.  Does "Elecraft" display when the K2
is powered on?

First check the DC voltage at the anodes of D6 and D7.  In receive D6
should be near 8 volts while D7 anode should be near zero volts.

If there is voltage at the anode of D7, the K2 is going into transmit.

It may be that there is a bad solder connection somewhere causing the
display problem.  That could be on any of the K2 boards.

73,
Don W3FPR

On 8/16/2017 7:07 PM, Dauer, Edward wrote:
> The display on my K2 (S/N 7637) just quit.  The backlight is on, but not a single digit component appears.
>
> The rig has been working FB for over a year.  Used it today as the alignment receiver for another K2 being built.  All was fine when that process started, both rigs worked as they should, and then the display on 7637 just went blank.  Illuminated, but blank..
>
> Hard to tell if anything else was affected since without any display information at all I don’t know what the rig is doing or what mode it’s in.
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[Christopher Hoover]

I have to wonder if you haven't run into the problem I had with my K3S
about four weeks ago.      Same symptoms.   The cause was a shorted filter
cap for the LCD bias on the display board.   Details are in the mailing
list archives.

73 de AI6KG





On Wed, Aug 16, 2017 at 4:07 PM, Dauer, Edward <[hidden email]> wrote:

> The display on my K2 (S/N 7637) just quit.  The backlight is on, but not a
> single digit component appears.
>
> The rig has been working FB for over a year.  Used it today as the
> alignment receiver for another K2 being built.  All was fine when that
> process started, both rigs worked as they should, and then the display on
> 7637 just went blank.  Illuminated, but blank..
>
> Hard to tell if anything else was affected since without any display
> information at all I don’t know what the rig is doing or what mode it’s in.
>
> Any suggestions about where I should start?
>
> Thanks, as always . . .
>
> Ted, KN1CBR
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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