jgg     2013 33 (增2):  139-141    ISSN: 0412-1961  CN: 21-1139/TG COMMON FAULTS AND MAINTENANCE ABOUT DIGITAL  PRECURSORY OBSERVATION SYSTEM IN SHANXI 1)Linfen Central Seismostation, Earthquake Adimistration of Shanxi Province, Linfen 041000 2)National Continental Rift Valley Dynamics Observatory of Taiyuan, Taiyuan 030025 Received: 2012-12-19  Revised: null  Online: 2013-10-24 Supporting info