K3 Utility fails to recognize K3

[Chuck Teague]

I can't get the K3 Utility to talk to the K3. When I test communications I
get no dialog boxes at all, and it doesn't populate the "Installed in Radio"
column.  I upgraded to the latest Utility and got the same results. Thinking
it might be the KUSB, I bit the bullet and installed a standard serial port
(been wanting to do that anyway) and a new straight through RS232 cable.
Same results.  I'm running FW 3.14 and wanted to install the beta FW.  I
couldn't find these symptoms on the reflector, so I'm stuck.  Is the KIO3
fried?  Any pointers will be greatly appreciated.

Chuck
NN7U



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[Guido Tedeschi-2]

2Cents wrote:
> I can't get the K3 Utility to talk to the K3. When I test communications I
> get no dialog boxes at all, and it doesn't populate the "Installed in Radio"
> column.
Chuck,
    test the RS232 TXD output: in idle state should be at least at -5V.
If it is about 0V and goes negative when you increase the power supply
to 14V, there would be a problem in the circuit that generates the
negative voltage for RS232.
A friend of mine had this problem and, after receiving and installing a
new KIO3 sent very quickly from Elecraft, I checked the faulty KIO3 and
found that the value of R1 (1K) was too low: changing that resistor with
2K2 made the oscillator working fine even with 10V of power supply.
73 de Guido, ik2bcp
 
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