Re: [Elecraft] K2 BFO CW alignment question

[Mark Petrovic]

I had an internal dialogue with myself as to whether I should reveal what
the problem was, and concluded that I should.  Maybe it'll help someone
else.  I was pushing the wrong button to activate CW RV.  For some reason,
my brain said I should push and hold the button below (XIT).  Problem
solved; rig works just fine.

Don, thanks.  Sorry to put you through that, but I did read your notes
above and correlate them with the schematic.  Something told me to double
check the button labels.  Glad it did.

Mark
AE6RT

On Sun, Jun 10, 2018 at 4:43 PM Don Wilhelm  wrote:

> Mark,
>
> Analyzing the switch matrix is an iterative process
> The first thing to do is to determine which wrong responses are being
> sent, and for that you must refer to the schematic.  In your case of the
> REV button and the STP 60 display, the hold of the REV button is
> bringing up the PF1 display.
> Check the TAP function of the same button (AGC) to see if it brings up
> the RIT announciator (I think it will).
> If so, it means that the D1 and D2 lines are somehow being activated at
> the same time.
> Your first check would be to see if there is continuity between pins 12
> and 13 of U2.  Also check for continuity to ground for both of those
> lines.  If you find U2 pins 12 and 13 shorted together, look for the
> reason - a solder splash making a bridge or a bit of wire lead stuck
> between the pins, look top and bottom of the board.
> That is how the process goes - as I indicated, it is not 'nice'.
>
> Hopefully those two buttons are the only ones involved.
> At worst, it means removing the pushbuttons and replacing them with
> new.  If it comes to that, clip the leads on the switch side close to
> the switch body and remove the leads one at a time, then troubleshoot
> the board.
>
> 73,
> Don W3FPR
>
> On 6/10/2018 7:15 PM, Mark Petrovic wrote:
> > Thanks, Don.
> >
> > Would you mind outlining the approach for analyzing the front panel
> switch matrix?
> >
> >
> >
>
>

-- 
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Re: [Elecraft] K2 BFO CW alignment question

[Mark Petrovic]

Don, thank for the excellent guidance.  I'll begin the debug process.

By the way, I have eliminated spurious contact between the encoder board
and control board, as I debugged that some weeks ago:
https://www.mail-archive.com/elecraft@mailman.qth.net/msg219585.html.
There is now room between the boards such that the plastic packing material
you mention moves freely about without friction.  This spurious contact
possibility was one of the first things I checked today when the "c"
indicator would not light.

On Sun, Jun 10, 2018 at 4:43 PM, Don Wilhelm  wrote:

> Mark,
>
> Analyzing the switch matrix is an iterative process
> The first thing to do is to determine which wrong responses are being
> sent, and for that you must refer to the schematic.  In your case of the
> REV button and the STP 60 display, the hold of the REV button is bringing
> up the PF1 display.
> Check the TAP function of the same button (AGC) to see if it brings up the
> RIT announciator (I think it will).
> If so, it means that the D1 and D2 lines are somehow being activated at
> the same time.
> Your first check would be to see if there is continuity between pins 12
> and 13 of U2.  Also check for continuity to ground for both of those
> lines.  If you find U2 pins 12 and 13 shorted together, look for the reason
> - a solder splash making a bridge or a bit of wire lead stuck between the
> pins, look top and bottom of the board.
> That is how the process goes - as I indicated, it is not 'nice'.
>
> Hopefully those two buttons are the only ones involved.
> At worst, it means removing the pushbuttons and replacing them with new.
> If it comes to that, clip the leads on the switch side close to the switch
> body and remove the leads one at a time, then troubleshoot the board.
>
> 73,
> Don W3FPR
>
>
> On 6/10/2018 7:15 PM, Mark Petrovic wrote:
>
>> Thanks, Don.
>>
>> Would you mind outlining the approach for analyzing the front panel
>> switch matrix?
>>
>>
>>
>>
>


-- 
Mark
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Re: [Elecraft] K2 BFO CW alignment question

[Don Wilhelm]

Mark,

Analyzing the switch matrix is an iterative process
The first thing to do is to determine which wrong responses are being 
sent, and for that you must refer to the schematic.  In your case of the 
REV button and the STP 60 display, the hold of the REV button is 
bringing up the PF1 display.
Check the TAP function of the same button (AGC) to see if it brings up 
the RIT announciator (I think it will).
If so, it means that the D1 and D2 lines are somehow being activated at 
the same time.
Your first check would be to see if there is continuity between pins 12 
and 13 of U2.  Also check for continuity to ground for both of those 
lines.  If you find U2 pins 12 and 13 shorted together, look for the 
reason - a solder splash making a bridge or a bit of wire lead stuck 
between the pins, look top and bottom of the board.

That is how the process goes - as I indicated, it is not 'nice'.

Hopefully those two buttons are the only ones involved.
At worst, it means removing the pushbuttons and replacing them with 
new.  If it comes to that, clip the leads on the switch side close to 
the switch body and remove the leads one at a time, then troubleshoot 
the board.


73,
Don W3FPR

On 6/10/2018 7:15 PM, Mark Petrovic wrote:

Thanks, Don.

Would you mind outlining the approach for analyzing the front panel switch 
matrix?





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Re: [Elecraft] K2 BFO CW alignment question

[Mark Petrovic]

Thanks, Don.

Would you mind outlining the approach for analyzing the front panel switch 
matrix?


> On Jun 10, 2018, at 3:55 PM, Don Wilhelm  wrote:
> 
> Mark,
> 
> OK on that.  Since you have the new encoder board, it could be touching the 
> pins on the back of the Control Board which can cause all kinds of "strange 
> happenings".
> First step is to flush cut (diagonal cutters will not do the job) the pins on 
> the encoder board (cut right down into the solder). Then flush cut the leads 
> on the back of the Control Board where it can contact the encoder board.
> As an added protection measure, put a piece of card stock (business card of 
> part of a QSL card) between the encoder board and the Control Board - or 
> better yet a flat piece of plastic, like that used in many shrink wrapped 
> packages from the store.
> 
> Then see if the behavior settles down.
> If it does not, you will have to find the problem in the Front Panel switch 
> matrix (not an easy task).
> 
> 73,
> Don W3FPR
> 
>> On 6/10/2018 6:44 PM, Mark Petrovic wrote:
>> Don, the soldering on RP1 is very clean, top (viewed from the side of the 
>> board with a light and magnifying glass) and bottom.  RP1 is aligned 
>> correctly, and I've verified that it is the correct part for this location.
>> 
>> Worth mentioning is that the rubber spacer that installs onto the 
>> bottom-side of the board in the corner nearest pin 10 of RP1 is attached 
>> with a small drop of super glue (the original adhesive on the rubber pad 
>> failed, as the pad fell off during casual handling of the board).  My 
>> understanding is that this cyanoacrylate  super glue  is non-conductive, nor 
>> does the spacer w/glue bridge any solder pads.  I've not inspected the front 
>> panel board from the top, as this would require unsoldering the 4 leads 
>> holding the encoder board to the front panel board.
>> 
>> 
> 
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Re: [Elecraft] K2 BFO CW alignment question

[Don Wilhelm]

Mark,

OK on that.  Since you have the new encoder board, it could be touching 
the pins on the back of the Control Board which can cause all kinds of 
"strange happenings".
First step is to flush cut (diagonal cutters will not do the job) the 
pins on the encoder board (cut right down into the solder). Then flush 
cut the leads on the back of the Control Board where it can contact the 
encoder board.
As an added protection measure, put a piece of card stock (business card 
of part of a QSL card) between the encoder board and the Control Board - 
or better yet a flat piece of plastic, like that used in many shrink 
wrapped packages from the store.


Then see if the behavior settles down.
If it does not, you will have to find the problem in the Front Panel 
switch matrix (not an easy task).


73,
Don W3FPR

On 6/10/2018 6:44 PM, Mark Petrovic wrote:
Don, the soldering on RP1 is very clean, top (viewed from the side of 
the board with a light and magnifying glass) and bottom.  RP1 is 
aligned correctly, and I've verified that it is the correct part for 
this location.


Worth mentioning is that the rubber spacer that installs onto the 
bottom-side of the board in the corner nearest pin 10 of RP1 is 
attached with a small drop of super glue (the original adhesive on the 
rubber pad failed, as the pad fell off during casual handling of the 
board).  My understanding is that this cyanoacrylate  super glue  is 
non-conductive, nor does the spacer w/glue bridge any solder pads.  
I've not inspected the front panel board from the top, as this would 
require unsoldering the 4 leads holding the encoder board to the front 
panel board.





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Re: [Elecraft] K2 BFO CW alignment question

[Mark Petrovic]

Don, the soldering on RP1 is very clean, top (viewed from the side of the
board with a light and magnifying glass) and bottom.  RP1 is aligned
correctly, and I've verified that it is the correct part for this location.

Worth mentioning is that the rubber spacer that installs onto the
bottom-side of the board in the corner nearest pin 10 of RP1 is attached
with a small drop of super glue (the original adhesive on the rubber pad
failed, as the pad fell off during casual handling of the board).  My
understanding is that this cyanoacrylate  super glue  is non-conductive,
nor does the spacer w/glue bridge any solder pads.  I've not inspected the
front panel board from the top, as this would require unsoldering the 4
leads holding the encoder board to the front panel board.

Mark

On Sun, Jun 10, 2018 at 2:48 PM, Don Wilhelm  wrote:

> Mark,
>
> That indicates you are not getting the right button response.
> Check the Front Panel Board.  My immediate guess is that you have a
> soldering problem on RP1, or that RP1 is inserted backwards. That is one of
> the R-Paks that MUST be inserted in the proper orientation.  Look at the
> board silkscreen for the pin 1 location, and look for the dot at the end of
> the R-Pak - they must be aligned.
>
> You could also have a solder splash somewhere on the FP board.
>
> 73,
> Don W3FPR
>
> On 6/10/2018 5:31 PM, Mark Petrovic wrote:
>
>> Don, thanks.
>>
>> When I exit CAL FIL, and press and hold CW RV, I see "ST P 0.60"
>> displayed (with the B RIT and XIT annunciators on) whether in CW, USB or
>> LSB mode.
>>
>> On Sun, Jun 10, 2018 at 2:21 PM, Don Wilhelm > > wrote:
>>
>
>


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Re: [Elecraft] K2 BFO CW alignment question

[Don Wilhelm]

Mark,

That indicates you are not getting the right button response.
Check the Front Panel Board.  My immediate guess is that you have a 
soldering problem on RP1, or that RP1 is inserted backwards. That is one 
of the R-Paks that MUST be inserted in the proper orientation.  Look at 
the board silkscreen for the pin 1 location, and look for the dot at the 
end of the R-Pak - they must be aligned.


You could also have a solder splash somewhere on the FP board.

73,
Don W3FPR

On 6/10/2018 5:31 PM, Mark Petrovic wrote:

Don, thanks.

When I exit CAL FIL, and press and hold CW RV, I see "ST P 0.60" 
displayed (with the B RIT and XIT annunciators on) whether in CW, USB 
or LSB mode.


On Sun, Jun 10, 2018 at 2:21 PM, Don Wilhelm > wrote:


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Re: [Elecraft] K2 BFO CW alignment question

[Mark Petrovic]

Don, thanks.

When I exit CAL FIL, and press and hold CW RV, I see "ST P 0.60" displayed
(with the B RIT and XIT annunciators on) whether in CW, USB or LSB mode.

On Sun, Jun 10, 2018 at 2:21 PM, Don Wilhelm  wrote:

> Mark,
>
> Get out of the CAL FIL menu and see if it does toggle the bar when in CW
> mode.  In SSB mode, it should toggle between LSB and USB.
> If it works in SSB mode, but not in CW, you may have a display fault that
> is not showing the bar - that is a different problem.
>
> 73,
> Don W3FPR
>
>
> On 6/10/2018 4:44 PM, Mark Petrovic wrote:
>
>> Thanks, Don.  In CAL FIL mode, holding CW RV does not toggle a bar over
>> the "c".  All my calibrations and tests have gone swimmingly til now.  Any
>> suggestions on where to start to troubleshoot this?  Is there another way
>> to verify if the toggle is being honored (could the over-bar LCD element be
>> bad?)?
>>
>
>


-- 
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Re: [Elecraft] K2 BFO CW alignment question

[Don Wilhelm]

Mark,

Get out of the CAL FIL menu and see if it does toggle the bar when in CW 
mode.  In SSB mode, it should toggle between LSB and USB.
If it works in SSB mode, but not in CW, you may have a display fault 
that is not showing the bar - that is a different problem.


73,
Don W3FPR

On 6/10/2018 4:44 PM, Mark Petrovic wrote:
Thanks, Don.  In CAL FIL mode, holding CW RV does not toggle a bar 
over the "c".  All my calibrations and tests have gone swimmingly til 
now.  Any suggestions on where to start to troubleshoot this?  Is 
there another way to verify if the toggle is being honored (could the 
over-bar LCD element be bad?)?


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Re: [Elecraft] K2 BFO CW alignment question

[Mark Petrovic]

Thanks, Don.  In CAL FIL mode, holding CW RV does not toggle a bar over the
"c".  All my calibrations and tests have gone swimmingly til now.  Any
suggestions on where to start to troubleshoot this?  Is there another way
to verify if the toggle is being honored (could the over-bar LCD element be
bad?)?

Mark

On Sun, Jun 10, 2018 at 12:55 PM, Don Wilhelm 
wrote:

> Mark,
>
> The CW reverse is indicated by a bar over the "c" to the right of the
> display.  Holding the REV button should toggle it.
> Likewise, that same button will toggle between USB and LSB.
>
> 73,
> Don W3FPR
>
>
> On 6/10/2018 3:37 PM, Mark Petrovic wrote:
>
>> I am performing the first alignment and test of the RF board of my K2 S/N
>> 7809.  On page 66 of the manual, I'm instructed to read page 91 of the
>> operating instructions to get familiar with the CAL FIL settings.  Page 91
>> says to work through the CAL FIL examples on page 93, wherein we work
>> through setting the BFO frequencies.  One of the steps says to hold CW RV
>> to switch to CW Reverse.  When I press and hold CW RV, should I expect
>> some
>> visual element to change to indicate that I am in this 'reverse' mode?  I
>> don't see any visual indication.  How do I know the press and hold of CW
>> RV
>> was effective?
>>
>


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Re: [Elecraft] K2 BFO CW alignment question

[Don Wilhelm]

Mark,

The CW reverse is indicated by a bar over the "c" to the right of the 
display.  Holding the REV button should toggle it.

Likewise, that same button will toggle between USB and LSB.

73,
Don W3FPR

On 6/10/2018 3:37 PM, Mark Petrovic wrote:

I am performing the first alignment and test of the RF board of my K2 S/N
7809.  On page 66 of the manual, I'm instructed to read page 91 of the
operating instructions to get familiar with the CAL FIL settings.  Page 91
says to work through the CAL FIL examples on page 93, wherein we work
through setting the BFO frequencies.  One of the steps says to hold CW RV
to switch to CW Reverse.  When I press and hold CW RV, should I expect some
visual element to change to indicate that I am in this 'reverse' mode?  I
don't see any visual indication.  How do I know the press and hold of CW RV
was effective?

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