lexicon m300_sb_002电路图.pdf

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1、3 Oak Park Bedford, MA 01730 Tel (617) 280-0300, Fax (617) 280-0499 M300 SERVICE BULLETIN #2 Please contact LEXICON CUSTOMER SERVICE with any questions. M300_002.BUL August 25, 1992 1 SUBJECT: M300 ANALOG BOARD, REV 4 REFERANCE: ECO 920117-01 PURPOSE: Remove left and right O/P ground etch from signa

2、l ground to eliminate possible ground loops. CORRECTIVE ACTION: All Rev 4 boards were ECOd prior to shipment. It is only necessary to verify the ECO has been performed in the event of ground loop complaints or suspicions. WARNING This modification should be performed by qualified technical personnel

3、 only. Damage caused by performing this modification may void the manufacturers warranty or standard repair policies. CAUTION Electrostatic Discharge (ESD) Precautions The following practices minimize possible damage to ICs resulting from electrostatic discharge or improper insertion. Keep parts in

4、original containers until ready for use. Avoid having plastic, vinyl or styrofoam in the work area. Wear a properly installed anti-static wrist-strap. Discharge personal static before handling devices. Remove and insert boards with care. When removing boards, handle only by non-conductive surfaces a

5、nd never touch open-edge connectors except at a static-free workstation.* Minimize handling of ICs. Handle each IC by its body. Do not slide ICs or boards over any surface. Insert ICs with the proper orientation, and watch for bent pins on ICs. Use anti-static containers for handling and transport. * To make a plastic-laminated workbench anti-static, wash with a solution of Lux liquid detergent, and allow to dry without rinsing INSTRUCTIONS: Check for etch cut at feed through adjacent to CR9 on solder side of board. If the etch is intact, it should be cut. RadioFans.CN 收音机爱 好者资料库