lexicon m300_sb_000808电路图.pdf

《lexicon m300_sb_000808电路图.pdf》由会员分享，可在线阅读，更多相关《lexicon m300_sb_000808电路图.pdf（1页珍藏版）》请在收音机爱好者资料库上搜索。

1、3 Oak Park, Bedford, MA 01730-1441 | Tel: 781-280-0300 | Fax: 781-280-0490 | Customer Support: Tel: 781-280-0300 | Fax: 781-280-0495 (Sales) | Fax: 781-280-0499 (Service) email: Sales Administration, Spares, Product & Technical Support and Repair Services M300 SERVICE BULLETIN Please contact LEXICON

2、 CUSTOMER SERVICE with any questions. Sbm300_000808-01.doc Date: July 16, 2001 1 SUBJECT: Encoder resolution with 36 position encoder (P/N 452-09762) REFERENCE: ECO 000808-01 DISTRIBUTION: International Pro Product Distributor Service Centers, Customer Service, Repair CORRECTIVE ACTION: Install V1.0

3、 ROM P/N 350-08059 EQUIPMENT REQUIRED: Clean, well lighted anti-static work bench with grounded wrist-strap #1 Phillips Screwdriver IC-ROM Puller WARNING Only qualified technical personnel should perform modifications. Damage caused by performing this modification may void the manufacturers warranty

4、 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 original containers until ready for use. Avoid having plastic, vinyl or styrofoam in the

5、 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 and never touch open-edge connectors except at a static-free workstation.* Minimize handl

6、ing 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

7、detergent, and allow to dry without rinsing. INSTRUCTIONS: On the FP Processor board, replace U2, 350-08574 IC,ROM,27128,M300 FP,V2.01 with 350-08059 IC,ROM,27128,M300 FP,V1.0. Note: P/N 350-08574 should be used with any M300 FP with encoder P/N 452-04233 SW,RTY,INC ENCODER,50 POS. P/N 350-08059 may be used with encoder P/N 452-09762 SW,RTY,ENCODER,36 POS,VERT MNT. Note, first serial number with 36 position encoder and V1.00 ROM (350-08059) is SN: 4947. Update customer units as requested. RadioFans.CN 收音机爱 好者资料库