Ron,
Upon re-reading your post, the voltage you measured at U3 pin 7 is about
what would be expected with a 13.5 volt power source.
Did you measure the U6 pin 5 voltage on the lead of the chip or at the
socket. If you measured at the socket, try at the chip lead because you
may have a pin bent under the firmware chip or a bad socket connection.
If you measure 2.633 (or 2.699) voltas on the actual microprocessor pin,
I believe you may have a bad input on that microprocessor - all the
display calculations are done in the firmware.
73,
Don W3FPR
Ron McCurdy wrote:
I'm building a K2. The [DISPLAY] button shows a voltage of less than 2
volts and it is erratic and, the current is shown as 0.00. I have checked
the voltages at U3 and they are 2.633 at pin 5, 6, & 7, and 13.75 at pins 2
& 3. Pin 1 is .571. I measured the voltage at Vsense on the MCU pin 5 and
it was 2.669. Where could I be losing the signal to the lcd??
Ron, KE5QDA
_______________________________________________
Elecraft mailing list
Post to: [email protected]
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.htm
Elecraft web page: http://www.elecraft.com
------------------------------------------------------------------------
No virus found in this incoming message.
Checked by AVG - http://www.avg.com
Version: 8.0.169 / Virus Database: 270.7.0/1680 - Release Date: 9/19/2008 8:25 AM
_______________________________________________
Elecraft mailing list
Post to: [email protected]
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.htm
Elecraft web page: http://www.elecraft.com
