7 Mar
2002
7 Mar
'02
3:16 a.m.
Yes, I have
not only heard this hint, but also tried to follow it. At
least with my tools, I always have trouble getting to the pins to cut.
There is not much room between a pin, the board, and the IC body.
I have a set of very sharp-nosed diagonal cutters - Xcelite, ISTR. They... ... From the description
of your problem, it sounds like you are trying to hold the dikes parallel
to the board.
I need to, because I can't get the tips between the shoulders of the
pins: because the pins are wider near the IC body, there is even less
room between them, and my cutter won't fit in. So I can only cut closer
to the board, even if I know that this may require the board to take
higher mechanical forces, compared to cutting near the chip.
OK, you convinced me: I'll go out and find better tools. Probably time
to do so anyway: I think I bought my current ones in the 1970s.
On multi-layer boards, it can be difficult to desolder
the power and
ground pins because the power and ground plane acts as a heat-sink. The
No problem: see my previous note about soldering iron. The 70W thing has
sufficient power, well under control, and I can switch between a
pen-shape and a screwdriver-shaped tip with no tools (provided it's not
currently at nominal temperature... ;-). For desoldering, I prefer the
screwdriver shape because it can easily transfer a lot of heat through
the flat surface. And, yes, it can help to add solder first: this can
improve thermal contact.
--
Andreas Freiherr
Vishay Semiconductor GmbH, Heilbronn, Germany
http://www.vishay.com