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
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
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.
On 4/28/2016 06:27, Don Wilhelm wrote:
> 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.
> 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
>> 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
>> 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
>> 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.
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Scott Ellington K9MA
Madison, Wisconsin, USA
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