Dear Members, I am sure some of you can give me ideas on how to analyze a card module which in four different occassions caused charring and smoke within the equipment. In all cases, fire did not spread and the charring occurred in all cases, arounf decoupling SMT capacitors located between the Vcc and ground.
The subject card sits in an industrial type computer within a GSM equipment. The card is fed by 5 V and 12 Vdc from the computer power supply and employs two SE:V interfaces. It employs a piggy board with a receiver with direct connection to an external outddor antenna. Any suggestions how this may have happened in the field, on four different occassions and the charring/burning occured around the decouplng capacitors. For this let us assume PWB is flame rated 94V-0 and is Recognized. Regards, PETER S. MERGUERIAN MANAGING DIRECTOR PRODUCT TESTING DIVISION I.T.L. (PRODUCT TESTING) LTD. HACHAROSHET 26, P.O.B. 211 OR YEHUDA 60251, ISRAEL TEL: 972-3-5339022 FAX: 972-3-5339019 E-MAIL: [email protected] Visit our Website: http://www.itl.co.il --------- This message is coming from the emc-pstc discussion list. To cancel your subscription, send mail to [email protected] with the single line: "unsubscribe emc-pstc" (without the quotes). For help, send mail to [email protected], [email protected], [email protected], or [email protected] (the list administrators).
