Jim,
Is this KPA100 newly assembled? Or did it work beefore?
Your KPA100 D9 and D10 diode measurements seem to be normal.
Check the orientation of all diodes against the parts placement diagram
in the back of the manual.
It would appear that you have a short on the 12 volt supply input of the
KPA100 - due to a solder splash or some other problem.
Look at all points that are labeled 12PA in the schematic.
Your ohmmeter from ground to the + terminal of J3 should show the short.
Any chance that you have assembled J3 backwards?
73,
Don W3FPR
On 2/6/2019 4:59 PM, Jim KO5V wrote:
Hi Don,
I got the following results:
1. Base K2 seems to be OK.
2. The KPA100 is upside down next to the K2, and everything is powered through
the K2 and its power supply. Using the LP-100 and 50ohm dummy load, the 5W and
10W measurements through the KPA100 check out nominally.
3. When I apply power through the KPA100's power port, and using its power
supply, the K2 and KPA100 are dead. The power supply measures about 1.8V when
plugged into the KPA100, but ~13.5V with no load.
4. As I mentioned below, I previously checked D9 and D10 and Q5. D10 and Q5
were OK, but I didn't really understand what I saw when I checked D9. From my
first post:
"I lifted one side of D10, and it seems to test OK, but when I did the same to D9, it looked
weird - In "diode" mode, I get .150V in one direction, open in the other. When I test it
in resistance, I eventually measure 80-90ohms in one direction (it takes a moment to settle), but
it's open in the other. It might be OK?"
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