Electronics Forum | Tue Jul 20 16:02:12 EDT 2010 | mikesewell
You may want to look at IPC 7721 Method 3.2 Bow and Twist Repair. In extreme cases you may need clamp or weight the pcb with bow in the other direction to yield a "flat" pcb in the unrestrained state. You will have to take the PCB up to or slightly
Electronics Forum | Tue Mar 21 20:30:48 EST 2000 | Dave F
Marc: Experimental evidence is rare. Published reports are rarer. I can�t comment on the impact of rework on your RF boards. I can tell you that: � HF is pretty LF these days. � We allow three rework actions on each aboard. � IPC-7721 is a fine s
Electronics Forum | Thu Aug 02 19:48:53 EDT 2001 | davef
IPC-7711 & IPC-7721 Training and Certification Program Detailed information on the industry standard program for rework, repair and modification of electronic assemblies. [http://www.ipc.org/html/fstraining.htm] Guides and training at http://www.cir
Electronics Forum | Fri Apr 13 10:34:36 EDT 2012 | bandjwet
1 thickness therefore a DEFECT Does defect violate Min Elect clearance-If YES then defect Make sure you have a dialogue with customer on this one because it will be a repair. The repair itself can be done per IPC7721 procedures. Bob Wettermann B
Electronics Forum | Thu Oct 14 20:42:07 EDT 1999 | Jeff Ferry
Grace, As deifned in IPC 7721 Procedure 3.2 Bow and Twist Repair "Bow and twist after soldering shall not exceed 1.5% for through hole PC boards and .75% for surface mount PC boards. The bow and twist shall not be sufficient to cause difficulties d
Electronics Forum | Thu Sep 10 09:44:05 EDT 1998 | Earl Moon
| | Can anybody point me to a Standard that provides details on the use of Wire Links for the repair of SMT PCBs, e.g. the maximum number of permissible links, the material to be used, the method of joint etc.? | Dave: ANSI/IPC-R-700 answers many of
Electronics Forum | Thu Sep 10 17:26:56 EDT 1998 | Dave F
| | | Can anybody point me to a Standard that provides details on the use of Wire Links for the repair of SMT PCBs, e.g. the maximum number of permissible links, the material to be used, the method of joint etc.? | | Dave: ANSI/IPC-R-700 answers man
Electronics Forum | Mon Dec 11 06:29:04 EST 2006 | bwet
See before cversus after pics on BGA pad repair here: http://solder.net/services/services_pad-repair.asp The "how to" instructions for traces (and pads) is here: http://solder.net/solderingtips/PadandTrace_Repair_Solder_Tip12.wmv The skill level
Electronics Forum | Fri Jan 29 12:04:13 EST 2010 | davef
In response: * We know of no "videos about Pb-Cu intermetallic." Intermetallics are usually observed in microsections of solder connections. * We are unaware of "Pb-Cu intermetallic." In most soldering results in a copper-tin intermetallic. * Trainin
Electronics Forum | Tue Oct 04 20:31:16 EDT 2016 | davef
IPC-7721, Section 6.1, Jumper Wires, Jumper Wire Selection #5 states: "Recommended wire is solid, insulated, plated copper wire, 22 to 32 AWG with a heat resistant insulation. Wire with tin-lead plating may be restricted due to environmental laws."
