I hesitate to write this for fear of scaring off some potential "modifiers",
but the story is good and positive.
I did all 3 of these mods today. (The stereo speaker mod was outlined in a post
from Wayne). After reassembly the radio worked fine and I was able to set the
amplifier ALC just right.
Then, after 3 hours, funny things happened. I could not change frequency. I
could not turn off the K3. After disconnecting the power supply, the K3 came
on with an "ERR PTT" message. Looked it up in the manual. Implicates the
KIO3, where I had just made modifications. I easily isolated the problem to
the digital IO board.
Scanning the digital IO board with my illuminated magnifier I initially saw
nothing. Then, a faint shiny speck showed up on one of the 8 pin surface mount
chips that was shorting two pins. The offending speck was easily removed. It
had obviously been created during my mod work, and took 3 hours of aging before
it would short out the pins, creating the problem.
I usually brush my circuit boards with a tooth brush after soldering to them. I
did not do that this time. I will do it next time. All is well.
Merry Christmas/Happy Holiday Season to all Elecrafters.
Monty K2DLJ
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