[Elecraft] K2 - KAT2 receive 4.7v voltage out on U4 pin 1 and 7

[ChrisM]

I have finished building the KAT2 got the null to 001 and then checked the
voltage at pin 1 at U4 which read at 0 on receive then went into tune at 5W
and P1, U4 read about 4.6v. When I went back to receive the voltage at P1
and 7, U4 was 4.7v. Checked voltages on receive and P8, U4 read 6.06v and P3
read 0.01v to 0.02v, P4,5, and 6 of course at 0.00v. P5 of U1 and R1 center
also read between .01 and .02v. Assuming U4 was bad I replaced U4 with
another LM358 (not 100% sure if good, never used before.) and now have 4.8v
on 1 and 7 with all other voltages the same as before. Could U4 be good and
am I missing something or do I need to buy a new LM358 that I know is good
(have another LM358 how can I check it before I install it?)? Any help or
Ideas would be appreciated. 

The K2 itself passed all tests once I got a good Dummy load. Just been
listening and limited to 20m to 10m due to size of my hobby room. Have yet
to make any contacts as I still have to get a mic or learn CW.

Thanks,
    Chris KD0WDK



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