From mboxrd@z Thu Jan 1 00:00:00 1970 From: GOOI@oce.nl (Gooijen H) Date: Tue, 15 Apr 2003 08:37:20 +0200 Subject: [TUHS] PDP11/34 boot problems, here i am again :) Message-ID: <1A9EACFF5B9EB9489F00104C00ECF6410CBC02@hqvenlomail.oce.nl> "asbesto" wrote: > 1) a 74LS175 chip named E15 on our schematic diagram, that seem > phisically BROKEN on an edge (there is a fessure on the plastic > DIP package). i can't change it now because i don't have a > soldering station here to do a nice job, but looking the chip i > think it may work... I never remove IC's in *one* go. The chances that you damage the multi-layer board beyond repair are real. This is what I do. I use a dremel tool (small motor with sharp rotating blade) to cut the pins of the IC one by one. Don't use a cutting tool to cut the pins because the side force might push the remainder of the pin through the solder joint thus damaging the board. After you have cut all the pins the IC just falls of the board. Now, you can use a fine hot soldering iron and remove the pins one by one use a pair of squeezers. good luck with your repairs, - Henk.