Posted by
Don Wilhelm-4 on
Sep 12, 2007; 2:10pm
URL: http://elecraft.85.s1.nabble.com/voltage-display-problem-tp452774p452775.html
Joe,
Check the VSENSE signal path from U3 pin 7 to U6 pin 5. The easiest way
to check is to measure the voltage at both points. On the U6 pin 5 end,
measure the voltage directly on the chip pin rather than the socket. If
the voltage is different, there is some break in the path - check the
socket and be certain pin 5 is securely in contact with the socket.
If you find the voltage going into U6 pin 5 is the same as at U3 pin 7
and your voltage display still says 23.3, the only cause can be a bad
input on U6 (in that case, you need to replace the firmware chip).
73,
Don W3FPR
MARY HAYS CARNEY wrote:
> I have some problems with my K2 transmitter section, but first would like to clear up a problem with the voltage display. After giving the correct value for several days, it suddenly began to read 23.3 volts no matter the input voltage. This persists even after resetting both the relays and the whole system (4-5-6). The volltage at the Vsense of U6 (control brd) is correct; I.e. about 2.1 volts for 11.9 in or 0 for 0v in but the display only reads 23.3 v. The current display is correct. Any hints of where to look next?
>
> joe carney KB3FBR
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