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NYC vintage computer cap work

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iampoor:
I work mostly on sensitive vintage audio gear (MANY poorly etched and deteriorating PCB's), so servicing those boards would not be a problem, but living on the other side of the country might be.  ;D

If you cannot find anyone local feel free to drop me a line.  :-+

NYEngineer:

--- Quote from: iampoor on July 06, 2016, 03:58:06 am ---I work mostly on sensitive vintage audio gear (MANY poorly etched and deteriorating PCB's), so servicing those boards would not be a problem
--- End quote ---

I think the biggest problem on these boards is that they are 4-layer boards. I have no idea how to desolder and resolder caps on this, even though they're apparently regular old tantalum through-hole caps. I assume that they somehow connect the V and GND planes of the multilayer board.

You can see through the layers to the lower layers. It's pretty cool.

Thanks for the offer. :)

helius:
There is no practical difference between 2-layer and 4-layer boards from a mechanical standpoint. They both have plated through holes in which the component leads are soldered. There is no physical solder bridge between the pin and inner planes.



In both cases, the solder must be either removed or completely liquefied before the component is pulled, or the plating will get pulled out while it is still stuck to the lead. This requires a higher skill level to repair, and special bonding equipment (miniature rivet press). This is the reason that when the component is dead, it is widely recommended to cut its leads before attempting to desolder them. When each lead can be pulled separately, it is much easier to liquefy the solder in only that one hole. If the solder in every hole can be removed, that allows the component to be removed without damage, but that requires practice. The solder always wicks out much better when there is no pin in it.

iampoor:

--- Quote from: NYEngineer on July 07, 2016, 03:39:55 pm ---
--- Quote from: iampoor on July 06, 2016, 03:58:06 am ---I work mostly on sensitive vintage audio gear (MANY poorly etched and deteriorating PCB's), so servicing those boards would not be a problem
--- End quote ---

I think the biggest problem on these boards is that they are 4-layer boards. I have no idea how to desolder and resolder caps on this, even though they're apparently regular old tantalum through-hole caps. I assume that they somehow connect the V and GND planes of the multilayer board.

You can see through the layers to the lower layers. It's pretty cool.

Thanks for the offer. :)

--- End quote ---

4 layer boards are not any more difficult to work on if you have decent soldering equipment. Sometimes they require extra patience.  >:D

Anytime!

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