Checking U1 for communication with the K3

[Arthur Nienhouse]

I want to check my K3 for communication with my computer.

Does anybody know what value and which pin to check on U1 on the I O
board lightning strike near by hit my wireless router modem and killed
my desk top computer which was connected to my K3 rs232 port?
I do not have at this time any computer or usb/serial adapter to test
the radio with.

Regards
Art
ka9zap
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[Cady, Fred]

Hi Art,
Try this:

The error message ERR IO3 often means that the RS232 serial interface
chip on the KIO3 board has failed. This may be caused by a static
discharge or nearby lightning strike. The chip that fails is U1 on the
KIO board, as shown in  Figure 7 25. Here is a procedure to check U1.
1. Remove any SERIAL and ACC cables.
2. Remove the K3's top cover.
3. Check to see if at least -5 VDC is present on pin 8 (or the gold
through-hole just below pin 8) of U1 (-7 VDC or more is normal).
4. Check to see if U1 is hot or visibly heat damaged.
5. If any of these checks indicates that the magic smoke has been
let out, you will need to contact Elecraft service to determine a course
of action to fix the KIO3 board.


Fred Cady
"The Elecraft K3: Design, Configuration and Operation Second Edition"
www.ke7x.com

> -----Original Message-----
> From: [hidden email] [mailto:elecraft-
> [hidden email]] On Behalf Of Art Nienhouse
> Sent: Monday, December 10, 2012 9:59 AM
> To: [hidden email]
> Subject: [Elecraft] Checking U1 for communication with the K3
>
> I want to check my K3 for communication with my computer.
>
> Does anybody know what value and which pin to check on U1 on the I O
> board lightning strike near by hit my wireless router modem and killed
> my desk top computer which was connected to my K3 rs232 port?
> I do not have at this time any computer or usb/serial adapter to test
> the radio with.
>
> Regards
> Art
> ka9zap
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html

[Arthur Nienhouse]

/*Thanks to all who responded
Regards
Art
ka9zap

*/
On 12/10/2012 12:56 PM, Cady, Fred wrote:

> Hi Art,
> Try this:
>
> The error message ERR IO3 often means that the RS232 serial interface
> chip on the KIO3 board has failed. This may be caused by a static
> discharge or nearby lightning strike. The chip that fails is U1 on the
> KIO board, as shown in  Figure 7 25. Here is a procedure to check U1.
> 1. Remove any SERIAL and ACC cables.
> 2. Remove the K3's top cover.
> 3. Check to see if at least -5 VDC is present on pin 8 (or the gold
> through-hole just below pin 8) of U1 (-7 VDC or more is normal).
> 4. Check to see if U1 is hot or visibly heat damaged.
> 5. If any of these checks indicates that the magic smoke has been
> let out, you will need to contact Elecraft service to determine a course
> of action to fix the KIO3 board.
>
>
> Fred Cady
> "The Elecraft K3: Design, Configuration and Operation Second Edition"
> www.ke7x.com
>
>
>> -----Original Message-----
>> From: [hidden email] [mailto:elecraft-
>> [hidden email]] On Behalf Of Art Nienhouse
>> Sent: Monday, December 10, 2012 9:59 AM
>> To: [hidden email]
>> Subject: [Elecraft] Checking U1 for communication with the K3
>>
>> I want to check my K3 for communication with my computer.
>>
>> Does anybody know what value and which pin to check on U1 on the I O
>> board lightning strike near by hit my wireless router modem and killed
>> my desk top computer which was connected to my K3 rs232 port?
>> I do not have at this time any computer or usb/serial adapter to test
>> the radio with.
>>
>> Regards
>> Art
>> ka9zap
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html

______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[hidden email]

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Please help support this email list: http://www.qsl.net/donate.html