[Elecraft] K2 [DISPLAY] Button

[Don Wilhelm]

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
>
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