Rich: Try creating plastic overlay templates with cut-outs for each of the tantalum caps on the board, with the polarity clearly marked on the template. You could create the templates by printing an edited 1-1 assembly drawing image onto transparancy film on your laser printer and cutting out the locations for the capacitors to be checked. Granted, it adds an additional inspection step in the process but it does detect installation errors before applying power to the board. Bill Fabry Plantronics, Inc. [log in to unmask] ____________________Reply Separator____________________ Subject: <no subject> Author: "TechNet E-Mail Forum." <[log in to unmask]> Date: 8/6/98 8:24 AM Hello, I am interested in a solution to installing tantalums in reversed. Plus symbols, silk-screen marking, etc. have proven inadequate. Failures come after many hours of reverse polarity in some applications. Are there any ideas on how to physically or otherwise prevent this. Thank you, Rich. ################################################################ 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 ################################################################