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Old 6th November 2012, 11:21 PM   #1
Einric is offline Einric  United States
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Default TO-3 Removal

How do you remove TO-3's?
They are bolted through a heatsink and soldered to the pcb.
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Old 6th November 2012, 11:30 PM   #2
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I think you have a pretty good handle on what you need to do reading the question....

1. Desolder leads. (Prior to unbolting)

2. Unbolt

3. Clean up any heat sink goo

And you are off

Installation is reverse of above
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Old 6th November 2012, 11:31 PM   #3
sreten is offline sreten  United Kingdom
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Hi, ?, undo the bolts and desolder the pcb connections, rgds, sreten.
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Old 6th November 2012, 11:46 PM   #4
Einric is offline Einric  United States
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Well this is a single sided PCB.
I'm pretty sure that there is through plating on the holes so I should be able to desolder them from the bottom.
I was just wondering if there was some trick.

I have two matched triplets of 2SJ50's and two matched triplets of 2SK135's that I want to save.
They are rare and may be nice for another project down the road.
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Old 6th November 2012, 11:56 PM   #5
sreten is offline sreten  United Kingdom
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Hi,

If a service engineer needed to do it a lot they would probably have
a soldering iron head that does both pins at once, allowing you to
simply lift the device out, and then clean up the board, a lot faster.

Same with removing op-amps etc, specialised soldering iron heads.

rgds, sreten.
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Old 6th November 2012, 11:57 PM   #6
Einric is offline Einric  United States
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I do have 2 soldering irons, LOL.
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Old 7th November 2012, 04:16 AM   #7
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If the board is single sided, it won't be "through-plated". Maybe a rivet or bush is fitted in some specialised gear of old. If you aren't too experienced, use solder-wick or similar fluxed braid to remove all solder first. That makes it as easy to drop the part out with just one iron as when it was first dropped in!
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Old 7th November 2012, 04:57 AM   #8
Einric is offline Einric  United States
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I got them out and the boards had a hollow rivet that the leads dropped through.
I just alternated between pins and they slid out under their own weight.
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