K2, Big problem...!

[F5UL-2]

Hi Waine, and all the team

First thing first, a Happy New Year 2012 to all the team!

Now, my problem :


I have, from a friend of mine a K2, #4895, who is not playing his part!!!
It come from South Pacific (French Polynesie) and the problem is manifest
with, mainly, no frequency display.
As I have another K2, I canibalized it to test the first.
-1/ I exchanged the control bord and everything is OK.
-2/ Next I put back in the Control Board and exchanged the µcontroler U1.
Identical results, no frequency display. I did check the U1 pin voltage, and
they seem OK.
-3/ I put back the µcontroler and exchanged the RF board µcontroler. No
changes the same result as the #2. I also dis check voltages on this RF
Board U1, and they look OK too.
Then, with my small digital scope, I tried to see the AuxBus signals, on the
Contro Board U1 and on the RF Board U1 too.
They look OK for me, but it's subjectif as I do not have the timing of the
µcontroler from the Control Board.
The frequency display give you either 0.000.00 or 15.999.99 dependign on the
band (but you do not know on wich band you are!)
But I ear the relais working each time I push Band+ or Band-. All other
functions seems to work. I'm able to set up the SMeter low and high values,
Mode change as it should,
All Menu functions come up and display correctly.
By the way, the curent is normal (13.9 V, 0.32 with only the NB in place).
The PA is dead, one 2sc1969 is open!

So, have you Waine or other people, any idea about what I should check?

Beside that I would like to order :

3 PA kits or 6 2sc1969 (E580008),
6 chassis fastener (E100078)

Just email me the amount for these parts and I will pay you as I always did.
I by your intervention I need some other part, I will then make another
order.



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[Don Wilhelm-4]

This is the Elecraft user's email list - we are users and not Elecraft
staff.
To order parts, you can either order from the website www.Elecraft.com
or send an email to either  [hidden email] or [hidden email].

If I understand your board swapping correctly, you have proven that the
Control Board (but not the MCU - U6) is producing the problem.
I suggest doing the Control Board DC Voltage measurements in appendix E
of the manual.  Do mind the setup notes at the top of the  DC Voltage Table.

Please clarify - in the beginning, you said "no frequency display", but
later, you mentioned a display of "0.000.00 or 15.999.99".  Please tell
us if the display is blank or just incorrect - 0.000.00 is a display of
zero frequency,  That IS a display of something even though incorrect
("no frequency display" is blank).

If an incorrect frequency display is your problem, try a Direct
Frequency Entry for each amateur band (use a mid-band frequency).

73,
Don W3FPR

On 1/7/2012 10:03 AM, Robert DROGOUL wrote:

> Hi Waine, and all the team
>
> First thing first, a Happy New Year 2012 to all the team!
>
> Now, my problem :
>
>
> I have, from a friend of mine a K2, #4895, who is not playing his part!!!
> It come from South Pacific (French Polynesie) and the problem is manifest
> with, mainly, no frequency display.
> As I have another K2, I canibalized it to test the first.
> -1/ I exchanged the control bord and everything is OK.
> -2/ Next I put back in the Control Board and exchanged the µcontroler U1.
> Identical results, no frequency display. I did check the U1 pin voltage, and
> they seem OK.
> -3/ I put back the µcontroler and exchanged the RF board µcontroler. No
> changes the same result as the #2. I also dis check voltages on this RF
> Board U1, and they look OK too.
> Then, with my small digital scope, I tried to see the AuxBus signals, on the
> Contro Board U1 and on the RF Board U1 too.
> They look OK for me, but it's subjectif as I do not have the timing of the
> µcontroler from the Control Board.
> The frequency display give you either 0.000.00 or 15.999.99 dependign on the
> band (but you do not know on wich band you are!)
> But I ear the relais working each time I push Band+ or Band-. All other
> functions seems to work. I'm able to set up the SMeter low and high values,
> Mode change as it should,
> All Menu functions come up and display correctly.
> By the way, the curent is normal (13.9 V, 0.32 with only the NB in place).
> The PA is dead, one 2sc1969 is open!
>
> So, have you Waine or other people, any idea about what I should check?
>
> Beside that I would like to order :
>
> 3 PA kits or 6 2sc1969 (E580008),
> 6 chassis fastener (E100078)
>
> Just email me the amount for these parts and I will pay you as I always did.
> I by your intervention I need some other part, I will then make another
> order.
>
>
>

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Please help support this email list: http://www.qsl.net/donate.html