Had similar flaky symptoms on my 23 year old K2. After careful visual
inspection it turned out to be a broken solder connection on the tuning
encoder. Wire barely broken off the encoder pin. Took 23 years to break!
--Lenny W2BVH
On 10/15/2022 5:36 PM, Don Wilhelm wrote:
Jerry,
That does sound like it might be a bad solder connection.
Try resoldering Front Panel RP1 and U2. Those components are critical
to decoding the switch matrix.
You might also try reseating Control Board U6 - but do so in a static
controlled manner.
With that 7xxx serial number, you might instead have a problem with
the FP Encoder board contacting the back of the Control Board which
causes "strange things" to happen.
Flush cut all leads on the encoder board (right through the solder
fillet) and also on the Control Board where the encoder board could
contact.
As an extra measure, put an insulator (fish paper is best, but a piece
of card stock or better yet, a piece of flat plastic (like from many
forms of plastic packaging) between the encoder and the control board.
73,
Don W3FPR
On 10/12/2022 5:51 PM, Gerald Wolczanski wrote:
from KI4io - Jerry Wolczanski
My K2 started exhibiting this problem in June and it's gotten worse.
The LCD toggles rapidly between the frequency and the last menu used.
A tap on the menu switch restores the display to normal. It was quite
infrequent to start, but now it's bothersome, happening every 10 - 15
minutes.
I re-flowed the switch contacts on the front-panel board this morning,
but the problem persists.
Is this a switch issue or something else?
K2 S/N 7xxx
KI4IO
Jerry Wolczanski
Warrenton, VA
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