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February 1999

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Subject:
From:
"Cash, Alan" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 8 Feb 1999 06:27:45 -0800
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text/plain (123 lines)
A jumper wire is a jumper wire.

Al Cash

> ----------
> From:         Stephen R. Gregory[SMTP:[log in to unmask]]
> Reply To:     TechNet E-Mail Forum.;[log in to unmask]
> Sent:         Sunday, February 07, 1999 1:04 AM
> To:   [log in to unmask]
> Subject:      [TN] Assy: Prototyping Band-aid...
>
> Hello Everybody!
>
>       Yes, I worked today (saturday)...but it's such crappy weather here
> today
> that it's not a big deal.
>
>       Anyways, I just wanted to share a little tip for a band-aid that got
> our
> butts outta the wringer, that I did on the prototype boards that I had
> talked
> about on Friday...the ones that I was waiting on the LSI parts for.
>
>      Got the SMT done on 10 boards yesterday, and this morning we were
> going
> to stuff the through-hole and wave these puppies. The boards are a PCI
> plug-in
> product and there's two 32MB SIMM's that are socketed on the board. We had
> the
> PTH almost all stuffed, and tried to stuff the SIMM sockets in the board
> and
> discovered that the footprint had gotten screwed up! Can you believe it? A
> 72-pin SIMM socket footprint got messed up!?! Let's see...SIMM sockets
> have
> been around since I was a lil' squirt haven't they? How does one screw
> that
> up?
>
> Anyways, there's two sections of pins for each SIMM, somehow it was
> laid-out
> where that gap in the center was too wide and of course the pins in the
> socket
> didn't line up with the holes in the board. There was a small panic
> spooling
> up, because these were pretty hot prototypes (but aren't they all?).
>
> Some feverishly urgent calls made to the design house and to the designer
> who
> did the lay-out...what good that was doing at this moment I've not a clue,
> the
> boards were already built...(but at least now I know who to give the
> 20-lashes
> with a length of solder wick to) and there was some hastily made
> suggestions
> for me to epoxy or glue the sockets to the board somehow, and then run
> jumpers
> from the pins on the socket to the holes on the board...that to me seemed
> like
> taking the scenic route to get where we wanna be. Plus, I didn't think the
> board would look too hot with 144 wires on it. One other thing,Tran, (my
> best
> rework operator) woulda' had me drawn and quartered if I had her wire up
> those
> sockets. She's pulled some real magic for me a time or two, and I surely
> didn't want to upset her!
>
> So what I wound up doing was getting some lead clippings from the drawer
> on
> our axial prep machine, and then had Tran solder one to every other pad on
> each side of the SIMM (THAT, she could deal with, not jumper wires...) and
> leave them long enough so they could be bent slightly and conform to the
> messed-up hole pattern on the PCB. We first asked our customer if it was a
> problem that the SIMM would be soldered into the board, they said not at
> all,
> just as long as they could power the board up and it had memory... WHEW!
> That
> was a close one!
>
> I know it's a simple tip, but the first reaction everybody had was to
> hurry
> and rush to get some more fabs made with the right footprint, pay mucho
> bucks
> for a prototype quantity of boards on a quick turn, and still wind-up
> delaying
> when the customer would get their "babies". As things turn out, it wound
> up
> causing us a little extra work, but the customer will still get their
> boards
> monday like we promised.
>
> Just a little something to store in the ol' memory banks (no pun intended)
> in
> case it ever happens to you...
>
> -Steve Gregory-
>
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