David,
There are several possibilities.
While it is possible that the "serial" cable may have been the the
problem, that could have damaged the KIO2 (or KPA100), but it could also
have damaged the MCU (U6) on the control board.
Did it go into transmit with no load? If so, it may be that Q7 and Q8
have been damaged. Check the resistance from the collector to ground.
It should start out at about 2k ohms and increase in resistance as the
electrolytics charge. If it is substantially less than that, the PA
transistors may have been damaged - that will trip the internal
resettable fuse (F1).
To remove 12v power from the PA transistors, you can remove them (do
that if the resistance check reveals them to be shorted), or you can
remove transformer T3.
After removing 12v from the PA transistors, see if the K2 powers on.
I don't know of anyone who is skilled in troubleshooting the K2 in
central FL, but someone may volunteer.
If you remove the PA transistors and do not have adequate desoldering
ability, clip the leads at the transistor bodies and remove the leads
one at a time. Clean up with solder wick and if solder remains in the
holes, heat the pads and push the solder out with a wooden toothpick.
Replace the PA transistors with the K2PAKIT from Elecraft - it has
matched PA transistors. I can give you some tests to check with the PA
transistors out to check whether transistors Q11 and Q13 are OK (they
are included with the K2PAKIT).
73,
Don W3FPR
On 2/19/2018 10:20 AM, David Perrin wrote:
Hi-
Two questions?
After 18 years my K2 doesn’t turn on. I did it. I must have incorrectly wired
the Serial cable. When it got plugged in - that did it.
There is power thru the Power button. With the radio disassembled to the main
pc board, (sans everything that can plug into the main board) and power applied
thru the 1/8” coaxial power connector power doesn’t seem to get beyond that.
I am not in a place where I can get more parts out on the bench, nor the
equipment except for a cheap digital Voltmeter.
Question 1: Is there someone in the central Florida area who knows this radio
and can shed some light on my problem?
Question 2: Is there someone in central Florida who repairs the K2?
Thanks for reading.
73 de Dave
k1op...@gmail.com
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