Ralph, Several years ago, I worked as an engineer for Bendix Engine Controls. We did a lot of modification as you are describing, for assemblies that were intended for critical airborne uninhabited applications. The tough part is clipping the lead while the part is still soldered to the board. Among the technicians there were 2 camps: those who advocated clipping while the part was soldered down, and those who advocated removing the part, discarding it, and putting the lead modification on a fresh part. A great deal depended upon the skill of the technician. We experienced some rework failures with both methods. Clipping the lead on the board risked both lead breakage and frit seal damage, while removal of the part risked damage to the board, and possibly the surrounding components. Given good removal equipment, removal of the old part was considered the more likely method to yield a reliable assembly. This does depend upon the board technology being used, however, since some boards can not withstand desoldering operations very well. Arthur Kahlich Solliday Engineering Corp. Phone: (415)621-0616 Email: [log in to unmask] -----Original Message----- From: Vaughan, Ralph H [SMTP:[log in to unmask]] Sent: Monday, June 01, 1998 5:42 AM To: [log in to unmask] Subject: [TN] CCA MOD Hi Guys, I am looking for some tidbits of info, mainly, I think, from folks in the component (IC) fab business. We are proposing a mod to a completed circuit card whereas we need to insert a resistor between a thru-hole DIP lead and another part. We would like to cut the DIP lead flush to the board on the component side, bend the lead out about 45 degrees, and hook and solder the jumper lead to it. (There are reasons we can't get to the back side of the board). The two concerns are lead breaking and compromising the hermeticity of the package. I know the glass frit is pretty tough, so do we have a good safety margin after this mod? tia (thanks in advance) Ralph ################################################################ 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 web site (http://jefry.ipc.org/forum.htm) for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################