I recently built a KX-1, and had the following problems (none of which
were my fault):
1. Factory installed solder bridge on the DDS chip pins, shorting out
clock input.
2. Bad DDS chip causing really bizarre behavior. Unrelated to above
solder bridge and definitely not a bad connection. Elecraft had never
seen that before.
3. Bad solder joint on pre-installed surface mount mixer chip on
carrier board.
It works fine now.
Based on my experience, I would be very suspicious of every surface
mount IC connection. Look at voltages and waveforms right at the
surface mount package lead. Unfortunately, you need a microscope and a
very fine-tipped soldering iron to re-solder them, and it's very easy to
create new solder bridges. Elecraft support suggested a piece of number
20 wire wrapped around the tip of a soldering iron. I used a Metcal
soldering station, but replacing the DDS chip was still difficult.
73,
Scott K9MA
On 4/28/2016 06:27, Don Wilhelm wrote:
Frank,
It sounds like the MCU is getting "mixed up". Try doing a Reset to
Factory Defaults.
See page 69 in the manual. It is a 2 step process.
1) Hold BAND and MENU together and power on - release the buttons
after the LED test. E09 should be displayed.
2) Turn power off, then back on and you should see E10. Tap any switch.
73,
Don W3FPR
On 4/28/2016 3:01 AM, Frank Cox wrote:
(this is a repost after accidentally adding this to another thread)
I'm building a KX1 and finished Part 1. I encountered problems during
testing.
First I noticed when scrolling through the MENU items some some
segments of
the LED display don't light on some menu item names. However the same
segments will light on another menu item so it doesn't seem to be a
problem
with the display itself. Also, tuning with the encoder and band switch
displayed as expected.
But now the display started going dark during tests and not coming
back on
after button clicks or encoder turns. When it does this the 5v and 6v
lines
still have correct voltages and nothing feels hot to the touch. The
only way
to get it to come back is to turn it off and wait a while.
I've carefully checked parts placement and solder joints and can find no
problems so far, and it passes all the part 1 voltage tests.
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
--
Scott Ellington K9MA
Madison, Wisconsin, USA
[email protected]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
