Arcade Collecting > Pinball
Rebuilding a Gameplan MPU-1
ChadTower:
Actually, I was thinking more along the lines of throwing slivers around the PCB, not into your eye.
But eye injuries are no joke, true enough, I'm recovering from one right now. :(
SirPeale:
--- Quote from: lilshawn on February 05, 2010, 01:26:12 am ---i find on allot of those old boards, using a dremel with a cutoff wheel to chop the ic's legs off right next to the chip, then using needle nose pliers and the soldering iron to take the stumps out, makes things allot easier....and less likely to rip of a trace because a leg is still semi-attached to the board.
it's easier to do it one at a time than to try and get all 20 at once IMO
--- End quote ---
I always do this when removing ICs. I was just trying to salvage the existing ones.
ChadTower:
--- Quote from: pinballjim on February 05, 2010, 12:11:43 pm ---Yeah, we heard you did it on a Burger King christmas card or something.
--- End quote ---
Nah, I scratched my cornea right before the AFC title game started. Bad scratch, too.
lilshawn:
--- Quote ---The dremel throws little metal slivers around. Be careful there.
--- End quote ---
it does? i usually use a mini cutoff disk (the non-fiberglass re enforced kind.) and get nothing but powder. which i just wash off with a spray of contact cleaner. no big chunks are involved at all.
--- Quote ---It's also a LOT easier to bounce the thing and gouge another part.
--- End quote ---
that usually only happens because your speed is too slow, and your pressing too hard/too fast... causes the end to bind up instead of just cutting through the metal. I don't really need to talk about making sure you hang on to it good n' tight do i?
"let the tool do the work for you" is what my shop teacher used to say....untill he chopped off his fingers...then he became the computer studies teacher...which was okay since i took that too.
what where we talking about?
SirPeale:
--- Quote from: SirPeale on February 05, 2010, 11:57:55 am ---I always do this when removing ICs. I was just trying to salvage the existing ones.
--- End quote ---
Not wanting to damage the board further, I invested in a desoldering iron. An Aoyue 474A+. It had been recommended on the KLOV repair boards with glowing reviews. Very reasonably priced unit, so I picked it up.
I wish I'd gotten one years ago. What would have taken me an hour to remove ONE chip with a sucker and braid took me the same time to do the entire board. Amazing. And the pads are so clean and shiny because it sucked up all the gunk.
You'll note the thread title has changed. I (stupidly) looked at the board and thought "oh hey! AS-2518-35!" for the sole reason of the battery. When I pulled up the schematics, of course they're completely different!
The schematics for the MPU-1 are here: http://files.pinball-fixers.com/gameplan/MPU_Schematic_(MPU-1).pdf. Trying to identify the chip @ U13. When I removed it from the board nearly all the legs came with it. All the other chips came off without complaint.
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