On 15 Dec 99 at 9:45, [log in to unmask] wrote: > Hi All > Is there a document that addresses the number of jumper wires that > can be used on an assembly that are not a part of the original > design. You know the kind that are put on to solve "open" problems. > Geeeesh! > > Susan Mansilla Hi Susan, I posted this earlier on this list on a similar question. I don't know which of the standards I mentioned are outdated now (at least MIL-STD-275 - replaced by IPC-D-275 - replaced by IPC-222x, but this one covers no jumper wires) and I don't know which standards for the below mentioned "lower" class were used for the numbers of allowed jumper wires. Some other responses on your question mention MIL-C-28809, like I did. As Kelly M. Schriver wrote, it is outdated with (as far we know) no direct replacement. The wonderful MIL-IPC crossreference from Eric Kalgren mentiones a MIL-C-28809B, related to IPC-CM770D. ** quoted message ** Date sent: Sat, 9 Oct 1999 03:14:42 +0200 Subject: Re: [TN] Maximum jumper wires allowed... A customer of mine who manufactures mostly class 2 or 3 products has (or had) the following procedure: They define two own classes for PWBs and assemblies. The "lower" class refers to in-house standards, IEC359 and DIN IEC 326, the "higher" to MIL-P-46843, -P-55110, -STD-275, -STD-454, and DOD-STD-2000-1 to -4. The copy of the jumper wire procedure itself is from 1991, and I assume they have meanwhile these definitions updated to IPC-222x and other newer standards. The "lower" class has the following rules: a) max numbers of ALL repairs, added components, jumper wires etc. PCB size in cm^2 number < 100: 5 100-300: 10 300-600: 15 > 600: 20 b) jumper wires and added components < 100: 3 100-300: 6 300-600: 9 > 600: 12 The "higher" class allows no repairs. For repair they refer to IPC-R-700 and MIL-C-28809, but mostly to other in-house procedures. *** End of quoted message *** Susan, if you reply me offline an tell me which company you are with, then I can try to ask my customer whether he would be willing to share the latest revision of his procedure. This should refer to the latest and valid MIL/IEC/IPC/whatever standards. Hope this helps. Regards Matthias Mansfeld ----------------------------------------------- Matthias Mansfeld Elektronik * Leiterplattenlayout, Bestueckung Am Langhoelzl 11, 85540 Haar; Tel.: 089/4620 093-7, Fax: -8 Internet: http://www.mansfeld-elektronik.de ############################################################## TechNet Mail List 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 web site (http://www.ipc.org/html/forum.htm) for additional information. If you need assistance - contact Gayatri Sardeshpande at [log in to unmask] or 847-509-9700 ext.5365 ##############################################################