11 Sep
2011
11 Sep
'11
noon
I've not seen any comment here about reaming out the thru hole plating
on multiple layer boards. Sometimes this ream will do so, and you need
the board schematic to tack back in jumpers for internal leads if they
exist. That is assuming you don't take the pads off with a ream job.
When I had a known problem, I'd do as suggested elsewhere and clip the
IC out, if necessary at the board, but if the IC was expendible, at the IC.
Then take a bit of high temp or tungsten drill rod in a pin vice and
reheat the hole. Use the tungsten to push out the pin and leave in
place till it cools with slight motion. you can the work the drill rod
back out and leave a nice hold, and hopefully the thru hole plating.
Key thing is to use a metal that won't have any chance of tinning when
you put it thru the hole during the reheat.
Jim
On 9/11/2011 11:34 AM, Chuck Guzis wrote:
Use round
wooden toothpicks, solder wick, and whatever else might work
> for YOU, and clean those holes COMPLETELY.
And sometimes a hole won't
clear because of a small piece of broken
off lead, no matter what you do. Those holes are*carefully* cleared
with a #70 wire drill in a low-speed Foredom handpiece (don't use a
solid-carbide drill--you'll just end up breaking it off).