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hivanhaecker(at)gmail.com
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Posted: Mon Oct 11, 2021 10:44 am Post subject: Desolderimg

I need to replace a rotary switch on my TKM Com 11/A radio. I inadvertently broke the shaft while exiting the airplane. It is soldered to a pc board in 13 locations (12 around the perimeter and 1 in the center. I have no experience with desoldering things from a board. My questions are as follows: Is this a particularly difficult thing for a novice? Is there a tool I should purchase for desoldering? If I really need to farm this out, are there any suggestions where to find someone capable of doing this? Thanks for any and all suggestions.

Ivan Haecker

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recapen(at)earthlink.net
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Posted: Mon Oct 11, 2021 11:07 am Post subject: Desolderimg

I have used a product called solder wick.  It's a copper wire mesh that absorbs heated solder.  I have also seen vacuum devices to extract the headted solder.



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On Mon Oct 11 14:43:16 EDT 2021 "H. Ivan Haecker"  wrote:

               

                  I need to replace a rotary switch on my TKM Com 11/A radio. I inadvertently broke the shaft while exiting the airplane. It is soldered to a pc board in 13 locations (12 around the perimeter and 1 in the center. I have no experience with desoldering things from a board. My questions are as follows: Is this a particularly difficult thing for a novice? Is there a tool I should purchase for desoldering? If I really need to farm this out, are there any suggestions where to find someone capable of doing this? Thanks for any and all suggestions.     

           

     

          Ivan Haecker     

                   	  Quote:

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alec(at)alecmyers.com
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Posted: Mon Oct 11, 2021 11:09 am Post subject: Desolderimg

If it’s a well made circuit board, you have a good powerful soldering iron with the right size bit (not too big, not too small) and know how to use desolder braid and solder sucker, and are ready for eventualities (like are equipped to snip the last couple of pins that won’t come away with the rest of the switch) - then it’s straightforward.



If not then you’ll start to lift tracks and damage the board.

An expensive piece of working equipment is a bold starting place to learn rework techniques.



 	  Quote: 	
		  On Oct 11, 2021, at 2:44 PM, H. Ivan Haecker <hivanhaecker(at)gmail.com> wrote:



I need to replace a rotary switch on my TKM Com 11/A radio. I inadvertently broke the shaft while exiting the airplane. It is soldered to a pc board in 13 locations (12 around the perimeter and 1 in the center. I have no experience with desoldering things from a board. My questions are as follows: Is this a particularly difficult thing for a novice? Is there a tool I should purchase for desoldering? If I really need to farm this out, are there any suggestions where to find someone capable of doing this? Thanks for any and all suggestions.

Ivan Haecker

 	  Quote:

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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Ceengland

Joined: 11 Oct 2020
Posts: 391
Location: MS

Posted: Mon Oct 11, 2021 12:05 pm Post subject: Desolderimg

Probably not a big deal for an experienced electronics tech, but I'm not sure I'd advise that as a novice exercise. Might be worth asking at your next EAA  chapter meeting if anyone there is a HAM operator (a lot of pilots are HAMs), or if anyone has experience with board-level electronics repair.

If you're determined to do it yourself, and you have the new switch in hand, you might be able to cut the individual terminals on the old switch. If you can do that without damaging the board, removing individual pins from the holes becomes a lot easier.

Again, not a beginner level task.

Charlie

electronics tech in a couple of prior lives

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On Mon, Oct 11, 2021 at 2:14 PM Alec <alec(at)alecmyers.com (alec(at)alecmyers.com)> wrote:



 	  Quote: 	
		  If it’s a well made circuit board, you have a good powerful soldering iron with the right size bit (not too big, not too small) and know how to use desolder braid and solder sucker, and are ready for eventualities (like are equipped to snip the last couple of pins that won’t come away with the rest of the switch) - then it’s straightforward.



If not then you’ll start to lift tracks and damage the board.

An expensive piece of working equipment is a bold starting place to learn rework techniques.



 	  Quote: 	
		  On Oct 11, 2021, at 2:44 PM, H. Ivan Haecker <hivanhaecker(at)gmail.com (hivanhaecker(at)gmail.com)> wrote:



I need to replace a rotary switch on my TKM Com 11/A radio. I inadvertently broke the shaft while exiting the airplane. It is soldered to a pc board in 13 locations (12 around the perimeter and 1 in the center. I have no experience with desoldering things from a board. My questions are as follows: Is this a particularly difficult thing for a novice? Is there a tool I should purchase for desoldering? If I really need to farm this out, are there any suggestions where to find someone capable of doing this? Thanks for any and all suggestions.

Ivan Haecker

 	  Quote:

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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_________________
Charlie

Eric Page

Joined: 15 Feb 2017
Posts: 247

Posted: Tue Oct 12, 2021 4:16 am Post subject: Re: Desolderimg

I'll second Charlie's advice.  Getting 13 pins desoldered successfully using a desoldering pump (a manual device that looks like a fat pencil) or desoldering braid/wick is going to be very frustrating, with potential to damage traces on the board.



If you can access all of the pins around the perimeter of the switch to cut them free with a small, sharp pair of snips, then you'll just have to melt the solder on the center pin to remove the switch.  With that done, removing the pin ends that remain in the outer holes will be MUCH easier, and you'll just have to clean up the holes with braid/wick.



There is a tool designed for this task, called a vacuum desoldering tool.  It has a base station that sits on the bench, connected with a hose and cable to a gun-shaped tool with a heated tip.  A vacuum pump in the base pulls air through the hollow tip of the tool to remove solder once it's melted.  You'll spend at least $100 for a minimally acceptable Chinese tool.



As others have said, this probably isn't a first-timer's project.  Where in the country are you located?  Maybe someone on this forum has the tools and is near you.

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hivanhaecker(at)gmail.com
Guest

Posted: Tue Oct 12, 2021 1:57 pm Post subject: Desolderimg

Thanks for your responses. I’ve got a new switch on the way, as well as

some desoldering devices. I will try my hand at it after a little practice

on some trash bin stuff. Besides, it’s at least 30 years old and the worst

that can happen is that I end up with a new com radio. Nothing ventured,

nothing gained.



Ivan Haecker



On Mon, Oct 11, 2021 at 3:10 PM Charlie England <ceengland7(at)gmail.com>

wrote:



[quote] Probably not a big deal for an experienced electronics tech, but I'm not

 sure I'd advise that as a novice exercise. Might be worth asking at your

 next EAA  chapter meeting if anyone there is a HAM operator (a lot of

 pilots are HAMs), or if anyone has experience with board-level electronics

 repair.



 If you're determined to do it yourself, and you have the new switch in

 hand, you might be able to cut the individual terminals on the old switch

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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