Bill,
That was why Elecraft released MCU 2.04r which is exactly the same as
2.04P, but the sidetone source is locked at U8-4.
That can happen if someone EDITs the ST-L menu and then taps the DISPLAY
button without exiting the menu first.
Many hours of support time had been spent on the "I lost
Bill,
In the KPA100, the normal Vss is about -25 volts, so suspect that
something may be loading that negative supply.
Pull U4 out and measure that voltage again. If it is still not negative
enough, you may have a problem in the T/R switch. Check for 90 to 150
volts on the highest voltage
Alright, I have figured this out.
I’m not sure why I was seeing Vss of -5 volts. I re-checked the negative supply
on the KPA100, flowed the solder on D7 and D8. After that, I was seeing almost
-24 volts at the Vss pin, without U4 in place.
With U4 connected and everything hooked up, Vss was
Don,
Managed to do a little diagnosis.
I pulled the MAX1406 chip KPA100 U4.
I see proper continuity between pin 12 of U4 and pin 25 of the MCU, and pin 11
of U4 and pin 26 of the MCU.
Going back, I checked out the Vdd, Vss an Vcc voltages on U4.
Vdd is 14 volts
Vcc is 5 volts
Vss is -5 volts
Serial Number 2548.
The current MCU I have is version 2.04P. (latest)
The unit I swapped in earlier was, I think 2.03. I don’t have it with me, and
I’m not sure.
> On Nov 18, 2021, at 5:14 PM, Don Wilhelm wrote:
>
> Bill,
>
> What is the level of the MCU (before you changed it), and what
Exactly, working one day with WSJT-X, next day, not.
> On Nov 18, 2021, at 5:10 PM, Don Wilhelm wrote:
>
> Matt,
>
> I Forgot to mention that to Bill. The special cable does not have to be very
> long, but it must be present. Only pins 2, 3 and 5 should connect to the
> RS232 connector on
Yes, I know. I’ve been using the cable that I built back in 2002, when I added
the KPA100, and later modified when I added the KAT100.
> On Nov 18, 2021, at 4:14 PM, Matt Maguire wrote:
>
> Don’t forget, you can’t plug in a USB adapter directly into a K2, as the
> wiring is not standard
Bill,
What is the level of the MCU (before you changed it), and what level did
you try putting in?
And what is the serial number of your K2? Those may help to solve the
problem.
73,
Don W3FPR
On 11/18/2021 3:55 PM, Bill Coleman wrote:
U6 is kinda expensive to just replace….
I do have an
Matt,
I Forgot to mention that to Bill. The special cable does not have to be
very long, but it must be present. Only pins 2, 3 and 5 should connect
to the RS232 connector on the USB to serial adapter. Failure to follow
this will cause several "strange happenings" with the K2. The subject
Don’t forget, you can’t plug in a USB adapter directly into a K2, as the
wiring is not standard RS232C. You need to make up a special adapter as
described in the manual. Probably you know this already, but just something
else to check.
73, Matt VK2RQ
On Fri, 5 Nov 2021 at 06:31, Bill Coleman
U6 is kinda expensive to just replace….
I do have an older revision of the firmware for U6. I did try before
substituting the KPA100 U4, and it didn’t address the issue.
I guess this will require more sleuthing.
> On Nov 16, 2021, at 12:35 PM, Don Wilhelm wrote:
>
> Bill,
>
> Plug the
Bill,
Plug the ribbon cable in and do an end to end continuity test - KPA100
U4 pin 12 to Control Board U6 pin 25,
And KPA100 U4 pin 11 to CB U6 pin 26. That will check the board wiring
and the ribbon cable.
If all that is OK, try replacing CB U6.
73,
Don W3FPR
On 11/15/2021 7:28 PM, Bill
Well, I cut out the existing U4 MAX1406 chip on the KPA100 and soldered in a
16-pin socket. Putting in a new MAX1406 chip in the newly installed socket and
… same problem as before. The radio does not respond to commands, pressing the
PORT TEST does not result in any data output.
I haven’t had
Yes, Vss Vdd and Vcc all look like appropriate values.
> On Nov 4, 2021, at 3:47 PM, Don Wilhelm wrote:
>
> Bill,
>
> Make certain you have +12 volts on U4 pin 1 and +5 volts on U4 pin 16 and
> about -25 volts (-8 to -27 volts) on U4 pin 8.
> If those are correct, replace U4 and it should
Bill,
Make certain you have +12 volts on U4 pin 1 and +5 volts on U4 pin 16
and about -25 volts (-8 to -27 volts) on U4 pin 8.
If those are correct, replace U4 and it should work)
73,
Don W3FPR
On 11/4/2021 3:29 PM, Bill Coleman wrote:
About 10 days ago, I was having trouble with the
About 10 days ago, I was having trouble with the K2/100, as it was no longer
talking to WSJT-X correctly. I could get the audio running, but it would never
contact the radio.
Trying to set up for CQ WW Phone, I had the same trouble with N1MM.
Tried to use the PORT TEST feature by going to the
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