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
line said it "quit working", so I assumed it had worked just before it
quit.
73,
Don W3FPR
On 11/18/2021 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 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 <aa...@arrl.net> wrote:
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.
the man eis
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 SEC menu, selecting
PORT, going into EDIT, and pressing the DISPLAY button. It would say TEST,
but I’d see no characters transmitted.
Since I use USB serial adapters, I tried two of them, to no avail. Can’t
get a peep out of the K2/100.
Opening up the rig and digging out the scope, if I send characters on the
serial port, I see pulse trains on KPA100 U4 - the MAX1406 chip - pin 11
(R3OUT). So, it would appear that characters are reaching the main CPU.
If I put the scope probe on pin 12 (T2IN), it remains locked on ground,
never moving, even when I do the PORT TEST.
If I remove the P1 connector from the control board, and put the scope
probe on pin 1 of that connector, I DO see pulse trains from the PORT TEST.
This indicates to me that the CPU is OK, but something is wrong at the
MAX1406 chip in the KPA100.
In addition to not getting a response from the K2, it doesn’t appear to
obey commands. If I send RT1; or XT1; it doesn’t turn RIT or XIT on.
I tried using a different main CPU chip (I have one with older firmware),
but that doesn’t appear to make a difference. I’m wondering if my problem
is a blown MAX1406 chip.
Any recommendations or advice? It’s a big pain to remove the KPA100 board,
so I want to make sure what I’m replacing before I go after it.
Bill Coleman, AA4LR, PP-ASEL Mail: aa...@arrl.net
Web: http://boringhamradiopart.blogspot.com
Quote: "Not within a thousand years will man ever fly!"
-- Wilbur Wright, 1901
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