[Elecraft] K2 No Menu Problem

[Jim Brown]

Don, thanks for your help. Problem solved by replacing R2.

Regards,
Jim Brown, K5JAZ

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On 5/5/09, Don Wilhelm wrote:
> James,
>
> With 0.1 volts at CB U6 pin 29, I would expect that the K2 may be trying
> to transmit - and that would not allow access to the menu.
> So -- KEEP A DUMMY LOAD ATTACHED TO THE ANT JACK until you have the
> situation resolved.
>
> With power off, what is the resistance reading from CB U6 pin 29 to
> ground (measure both on the socket and at the chip pin, they should be
> the same, but check anyway) - with the paddles open (should be a high
> resistance)?  How about when the dash paddle is closed (should be about
> 220 ohms)?
> If you read a high resistance with the paddles open (or with nothing
> plugged into the key jack) and approximately 220 ohms with the dash
> paddle closed, I would look carefully at the soldering of CB RP4 pins 7
> and 8 - this resistor is the pull-up for the dash line and should bring
> the dash line to 5 volts with the paddle open.  But if those resistance
> readings are not within the realm of sanity, check CB P3 pin 17 and CB
> U6 socket pin 29.  Make certain U6 pin 29 is not bent under the socket
> nor sticking out to the side of the socket.  Also check RF Board J8 pin
> 17 and the inboard end of R2.
>
> Let us know where you find something that does not make sense.
>
> 73,
> Don W3FPR
>
>
> James Brown wrote:
>> K2 #2535 has no menus even though all other functions appear to work.
>> I did resistance and voltage checks on control board and found U6 pin
>> 29 (/DASH) at .10v instead of the expected 5.0v. The 8v and 5v
>> regulators are good.