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- > > ################################################################ > TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c > ################################################################ > To subscribe/unsubscribe, send a message to [log in to unmask] with > following text in the body: > To subscribe: SUBSCRIBE TechNet <your full name> > To unsubscribe: SIGNOFF TechNet > ################################################################ > Please visit IPC's web site (http://www.ipc.org) "On-Line Services" > section for additional information. > For technical support contact Hugo Scaramuzza at [log in to unmask] or > 847-509-9700 ext.312 > ################################################################ > ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################