Hi Gary;
Look in from with the top off at the RF board where the KAT3 or KANT3
board plugs in.
Check T4 for darkening, it gets cooked if DC is applied to the antenna
connector (like a remote preamp power connected backwards or similar).
You mentioned a remote tuner? Does it get power up the coax?
T4 is our# E690126, FT37-61x2,18T #26,PREWND
Also we went to beefier D36&D37 somewhere in the early serial # range.
Suggest shotgun replacing them if you don't find anything burnt.
They are on the bottom just opposite the KAT3/KANT3.
Our part # E560048 BAS70 Diode, 70V, SOT23 Infineon BAS 70 E6327
Digi-Key BAS70INTR-ND
You mentioned arcing, if in the K3, it is most likely the SA1 spark
arrestor on the KAT3 or KANT3 board.
With the top off, watch for it glowing when running higher power.
Our # E980130 SURGE ARSTR,350VDC,800V PULSE Digikey 495-1879-ND
When you get it fixed, you will want to run the TX gain cal again, and
after that, remember to never transmit at exactly 1.0MW, 5.0 or 50watts!
It will cause an inadvertent manual TX gain cal that can mess up the
gain cal.
Keith WE6R K3/K4 Tech
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