We make some COB PCBs and I need a UV solder mask touch up pens ?? Can anybody recommend addresses ? Thanks Anil Kher -----Original Message----- From: Roger Deakin <[log in to unmask]> To: [log in to unmask] <[log in to unmask]> Date: Friday, April 16, 1999 12:42 PM Subject: Re: [TN] Soldermask off-rework options >WE REPAIR OUR BOARDS USING BOTH THE SUGGESTED METHODS. BOTH ARE >ACCEPTABLE. > SOLDER METHOD >AS LONG AS YOU CLEAN THE EXPOSED COPPER AREA, AND APPLY FLUX AND >USE ONLY ENOUGH HEAT TO FLOW >THE SOLDER, THEN THERE WILL NOT BE A PROBLEM WITH THE HEATING OF >THE COPPER OR BOARD. > CAN YOU USE A LOWER MELTING POINT SOLDER FOR THIS >APPLICATION ? > > ADDING RESIST >CAN YOU ADD A COLOUR PIGMENT TO MATCH AS CLOSE AS POSIBLE THE >COLOUR OF YOUR RESIST ? >MIX UP SOME SAMPLES, AS IT DOES DRY A SLIGHTLTY DIFFERENT COLOUR. > >ASSUMING THAT THE PROBLEM IN THE FIRST PLACE IS ACCEPTABLE, THEN >DOING EITHER OPTION IS ONLY A COSMETIC ISSUE . > > >Roger Deakin. >email [log in to unmask] >tel +44 (0)1983 202632 >fax +44 (0)1983 202106 >company BRITISH AEROSPACE DEFENCE LTD LAND AND SEA SYSTEMS > > > >> -----Original Message----- >> From: glenn pelkey [SMTP:[log in to unmask]] >> Sent: Thursday, April 15, 1999 1:29 AM >> To: [log in to unmask] >> Subject: [TN] Soldermask off-rework options >> >> *** WARNING *** >> >> This mail has originated outside your organization, >> either from an external partner or the Global Internet. >> Keep this in mind if you answer this message. >> >> >> Hello all, >> >> We are seeing some soldermask coming off the board during >> assembly which exposes the copper. The size is relatively >> small at >> about 20-mils square, the location about 40-mils from the edge, >> and >> located on a ground plane. We think we know what's causing it, >> but my >> question deals with rework. >> >> Two options have been presented: >> 1) Apply new soldermask and cure. Seems reasonable, but the >> customer >> doesn't like the appearance. >> 2) Apply solder and clean. There may be an issue with >> applying >> enough heat to get good wetting and too much heat resulting in >> damage, especially considering it's a ground plane. >> >> Anyone know of a specification issue why either option can't be >> done? >> Any experiences, good or bad? >> >> Thanks for all your help, today and in the past. >> >> Glenn >> [log in to unmask] >> [log in to unmask] >> >> _______________________________________________________________ >> Get Free Email and Do More On The Web. Visit http://www.msn.com >> >> ############################################################### >> # >> 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 >################################################################ > > ################################################################ 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 ################################################################