Don,
Is U1 installed the 'right way around'? The voltages you measured with U1
removed seem to be correct for that condition.
You may have a faulty U1 on your hands.
73,
Don W3FPR
> -----Original Message-----
> Hi Guys,
>
> I seem to have K2 #5885 perking along quite well. I also installed
> the NB, DSP, SSB board and 160 board. With those behind me, I'm on to
> the KPA 100.
>
> On my initial voltage checks, page 25 of the manual, I'm getting some
> bad readings.
>
> Test Point Reading Should be
> U1 pin 1 7.0 5.0
> U1 pin 7 8.0 0 - 0.1
> U1 pin 13 7.0 0 - 0.1
> U1 pin 20 7.0 5.0
> U1 pin 27 7.6 5.8
>
> U4 pin 11 5.8 5.0
>
> I pulled U1, and all readings were within spec except for
>
> U1 pin 7 13.1 0 - 0.1
> U1 pin 27 8.0 5.8
>
> So, it seems that voltage regulator U3 is OK, as it reads 5.0 with U1
> out of the picture.
>
> Could I have a bad Q12?, or is it possible U1 is the culprit, or ????
>
> Thanks
>
> Don
> W0DJC
>
--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.432 / Virus Database: 268.15.29/608 - Release Date: 12/29/2006
8:22 AM
_______________________________________________
Elecraft mailing list
Post to:
[hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
http://mailman.qth.net/mailman/listinfo/elecraft
Help:
http://mailman.qth.net/subscribers.htmElecraft web page:
http://www.elecraft.com
Locked
