C9 on KIO3

[aandrei]

Hi,

I knocked out C9, a big capacitor (compared to the other SMDs) while reistalling the subRX.
It got hooked by the coax from the Aux antenna.

My question is, what does C9 do, and what would happen without it ?

Also any suggestions ? I never did SMD soldering, and also this one seems tricky. It still hangs in its [upper] side connection, but it seems as the second connection is underneath it ?

Thank you.

Adi, 2E0TTX


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[Bill W4ZV]

aandrei wrote

Hi,

I knocked out C9, a big capacitor (compared to the other SMDs) while reistalling the subRX.
It got hooked by the coax from the Aux antenna.

My question is, what does C9 do, and what would happen without it ?

Also any suggestions ? I never did SMD soldering, and also this one seems tricky. It still hangs in its [upper] side connection, but it seems as the second connection is underneath it ?

C9 appears to stabilize the +12V coming from a switch so it is important.  I once unknowingly knocked a very small SMD cap completely off a board and discovered it lying inside the K3.  It took forever to find where it went but I finally did and reseated it!  

Yours should be fairly easy to reseat assuming the pad is not torn from the board.  Since you're not familiar with SMD soldering, you may want to find someone locally to reseat it for you.  I'd first remove KIO3 Main, identify both pads where it belongs, apply heat to the connected side so that the chip falls on the correct position (assuming it's not torn off) and then solder the other side.  If the pad is torn, it still might be possible to use some fine wire to make connection to an adjacent connection.

73 & GL!

Bill  W4ZV

[aandrei]

Encouraged by Gary Surrency's feedback that I can just replace it with a normal capacitor, I just went ahead and did it..
In any case, I understood from Gary that RS232 wouldn't work if I messed up, and RS232 worked totally fine, controlling the radio from Ham Radio Deluxe. So all good here now.

Thanks Gary and Bill for your help,

Adi
2E0TTX

On 05/05/2011 15:56, Bill W4ZV wrote:

> aandrei wrote:
>> Hi,
>>
>> I knocked out C9, a big capacitor (compared to the other SMDs) while
>> reistalling the subRX.
>> It got hooked by the coax from the Aux antenna.
>>
>> My question is, what does C9 do, and what would happen without it ?
>>
>> Also any suggestions ? I never did SMD soldering, and also this one seems
>> tricky. It still hangs in its [upper] side connection, but it seems as the
>> second connection is underneath it ?
>>
> C9 appears to stabilize the +12V coming from a switch so it is important.  I
> once unknowingly knocked a very small SMD cap completely off a board and
> discovered it lying inside the K3.  It took forever to find where it went
> but I finally did and reseated it!
>
> Yours should be fairly easy to reseat assuming the pad is not torn from the
> board.  Since you're not familiar with SMD soldering, you may want to find
> someone locally to reseat it for you.  I'd first remove KIO3 Main, identify
> both pads where it belongs, apply heat to the connected side so that the
> chip falls on the correct position (assuming it's not torn off) and then
> solder the other side.  If the pad is torn, it still might be possible to
> use some fine wire to make connection to an adjacent connection.
>
> 73&  GL!
>
> Bill  W4ZV
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/K2-K3-Operating-Tip-Using-SCAN-to-keep-an-eye-on-your-favorite-too-quiet-band-tp6331212p6334524.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
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