[Elecraft] KIO2 stopped working - Wrong!

[John Huffman]

Don -

Checked all the inductors and all showed continuity.

The KPA100 works great when plugged into the K2.

Tomorrow I'll check the voltages on the KPA100's U4, MAX1406.  But, if the K2 
works via the ribbon cable, I may be barking up the wrong tree.

As always, many thanks for the help.

73 de K1ESE
John


Don Wilhelm wrote:
> John,
> 
> Don't be so quick to conclude it is the KPA100 - the lines used for KPA100
> control are different than the lines used for computer control.  Only 3 of
> the pins in that connector are used for the serial port function, the rest
> are used for K2 functions.  It pains me to hear the entire connecter
> referred to as a 'serial port' - look at the name on the connector, it is
> AUX I/O, and that means just what it says - an I/O connector for Auxiliary
> functions - the RXD and TXD signals are the only ones used for computer
> interfacing, and those are not used for KPA100 control when the KPA100 is
> mounted externally.
> 
> If the KPA100 works with the ribbon cable plugged into the K2, then most
> everything is OK in the KPA100, but check the tiny inductors in both the
> KPA100 (next to the DB9 connector) and on the KIO2 - on the KIO2, there is
> one inductor on the AUX board.  Any of those inductors open will cause
> problems with the KIO2 to KPA100 (or KAT100) interface.
> 
> 73,
> Don W3FPR
> 
>> -----Original Message-----
>>
>> Oops, I found the computer end of the cable was not connected to
>> the computer  :-(
>>
>> OK, then the KIO2 works fine.  So, the problem must be with the
>> KPA100 serial
>> port.  I'll start checking there.
>>
>> Sorry for the bandwidth...
>>
>> 73 de K1ESE
>> John
>>
>>
>>
>>> Now that my KPA100 is working well, I'd like to return it to
>> the EC2 case separate from my K2.  However, the KPA100 does not
>> want to talk to the K2 through my KIO2.  The KIO2 had been
>> working at one time.
>>> To be sure the problem was in the KIO2 and not the KPA100, I
>> tried to use the KIO2 to talk to my computer.  It didn't work
>> although it had worked fine in the past with both the KPA100 and
>> the computer.  I conclude that since the KIO2 won't talk to
>> either, the problem is in the KIO2.
>>> I inspected the soldering and all looked fine.  I checked the
>> voltages in the manual and all seemed fine with these exceptions:
>>> J1 pin 2 should be -8.0 measured -9.5
>>>   same on U1 pin 5
>>> J1 pin 4 should be 4.5 measured 5.9
>>>   same on J2 pin 7
>>> J1 pin 3 should be 0.1 measured 0.00
>>>   same on U1 pin 2, U1 pin 4, U1 pin6
>>>
>>> So, the voltages aren't wicked off and it used to work.  Any
>> ideas on where to start next?
>>> 73 de K1ESE
>>> John
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