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KIO2 stopped working - Wrong!

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John Huffman-2

KIO2 stopped working - Wrong!

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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Don Wilhelm-3

RE: KIO2 stopped working - Wrong!

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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> Checked by AVG Free Edition.
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> 2/12/2007 1:23 PM
>

--
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Checked by AVG Free Edition.
Version: 7.5.441 / Virus Database: 268.17.37/682 - Release Date: 2/12/2007
1:23 PM

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John Huffman-2

Re: KIO2 stopped working - Wrong!

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
>> _______________________________________________
>> Elecraft mailing list
>> Post to: [hidden email]
>> You must be a subscriber to post to the list.
>> Subscriber Info (Addr. Change, sub, unsub etc.):
>> http://mailman.qth.net/mailman/listinfo/elecraft
>>
>> Help: http://mailman.qth.net/subscribers.htm
>> Elecraft web page: http://www.elecraft.com
>> --
>> No virus found in this incoming message.
>> Checked by AVG Free Edition.
>> Version: 7.5.441 / Virus Database: 268.17.37/682 - Release Date:
>> 2/12/2007 1:23 PM
>>
> --
> No virus found in this outgoing message.
> Checked by AVG Free Edition.
> Version: 7.5.441 / Virus Database: 268.17.37/682 - Release Date: 2/12/2007
> 1:23 PM
>
>

Don Wilhelm-3

RE: KIO2 stopped working - Wrong!

John,

Forget the check on the MAX1406 - that is not involved in the path you are
attempting to reconcile. The MAX1406 only does the CMOS level to RS-232
conversion for the computer interface out of the KPA100. You problem is in
one of the non-RS-232 signal lines.

If you want to check the paths the quickest way, try this:
First connect the cable between the KPA100 and the KIO2. Do not connect the
KIO2 cable to the K2 control board (you are going to be doing continuity
checks through the entire path). Remove the ribbon cable from the KPA100
board so you can easily get to the KPA100 points.

Make continuity checks on the full path for the following signals - you
should find less than 5 ohms on each signal path:

8R --- KIO2 AUX board pin 9 -- to KPA100 P1 pin 9
12CTRL --KIO2 AUX board pin 8 -- to KPA100 P1 pin 8
VRFDET --KIO2 AUX board pin 10 - to KPA100 P1 pin 10
ALC ---- KIO2 AUX board pin 7 -- to KPA100 P1 pin 7
AUXBUS - KIO2 AUX board pin 2 -- to KPA100 P1 pin 2
Ground - KIO2 AUX board pin 6 -- to KPA100 P1 pin 6
RS-232 signal Ground - KIO2 AUX board pin 5 -- to KPA100 P1 pin 5.

If all those paths show conductivity from end to end, the connections should
work unless something is shorted to an adjacent pin.

When you make these checks, you are testing the cable, the KPA100
connections and the KIO2 connections all at once - if any of them fail to
show continuity, you will have to find out which part of the 3 contain the
problem connection.

73,
Don W3FPR

> -----Original Message-----
>
> 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
> >
>

John Huffman-2

Re: KIO2 stopped working - Wrong!

Don -

Once again I want to thank you for your help in repairing my Elecraft.

I followed your instructions and quickly discovered that pin 8 on the DB9 of the
KIO2 was not soldered. Pressure alone had held it in place and it sure looked
solid, but with magnification I saw it was not the same as the others.

A little solder on the pin and I am back in business.

Don, you are a genius.

73 de K1ESE
John

Don Wilhelm wrote:

> John,
>
> Forget the check on the MAX1406 - that is not involved in the path you are
> attempting to reconcile. The MAX1406 only does the CMOS level to RS-232
> conversion for the computer interface out of the KPA100. You problem is in
> one of the non-RS-232 signal lines.
>
> If you want to check the paths the quickest way, try this:
> First connect the cable between the KPA100 and the KIO2. Do not connect the
> KIO2 cable to the K2 control board (you are going to be doing continuity
> checks through the entire path). Remove the ribbon cable from the KPA100
> board so you can easily get to the KPA100 points.
>
> Make continuity checks on the full path for the following signals - you
> should find less than 5 ohms on each signal path:
>
> 8R --- KIO2 AUX board pin 9 -- to KPA100 P1 pin 9
> 12CTRL --KIO2 AUX board pin 8 -- to KPA100 P1 pin 8
> VRFDET --KIO2 AUX board pin 10 - to KPA100 P1 pin 10
> ALC ---- KIO2 AUX board pin 7 -- to KPA100 P1 pin 7
> AUXBUS - KIO2 AUX board pin 2 -- to KPA100 P1 pin 2
> Ground - KIO2 AUX board pin 6 -- to KPA100 P1 pin 6
> RS-232 signal Ground - KIO2 AUX board pin 5 -- to KPA100 P1 pin 5.
>
> If all those paths show conductivity from end to end, the connections should
> work unless something is shorted to an adjacent pin.
>
> When you make these checks, you are testing the cable, the KPA100
> connections and the KIO2 connections all at once - if any of them fail to
> show continuity, you will have to find out which part of the 3 contain the
> problem connection.
>
> 73,
> Don W3FPR
>
>> -----Original Message-----
>>
>> 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
>>>
> --
> No virus found in this outgoing message.
> Checked by AVG Free Edition.
> Version: 7.5.441 / Virus Database: 268.17.37/682 - Release Date: 2/12/2007
> 1:23 PM
>
>