[1000mp] MkV blown front end fixed

[lhlousek]

I got back into town last night after a week away from home on business =
and continued digging into my MkV to troubleshoot the lack of RX.   As =
said last week,  there is a T/R circuit at the antenna input to the rig =
that employs three transistors, a pin diode switch, and a relay. The =
relay wasn't being activated. I was able to make the relay work by =
supplying 12V to it and the rig received fine. Today I did some =
troubleshooting and found that Q6451 was bad. I replaced it, and while I =
was at it, I also replaced Q6450. I verified correct operation of the =
circuit and the rig works FB now.

Troubleshooting the problem and replacing the transistors was relatively =
straight forward.  Digging into the rig and getting the main antenna =
tuner board out was pretty tricky.  If you have any questions, don't =
hesitate to ask.

Lou W7HV

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