– 7 –CHAPTER 1 General4. HOW TO READ PRECAUTIONS, DIAGNOSTIC, AND FAULT REPAIR INFORMATION4.1 Precaution about Diagnostic Procedure/Fault Repair ProcedureWhen performing diagnostic procedures/fault repair procedures, always adhere to the following actions:(1) When replacing a circuit card with a spare, handle the circuit card using the Field Service Kit.(a) To protect the circuit card from static electricity, wear a wrist strap before handling the circuit card.(b) Before extracting the circuit card from its mounting slot, set its MB switch to the UP side (ON).(2) When holding a circuit card by hand, wear gloves and be careful not to touch mounted parts, gold-platedterminal, etc., on the circuit card.The 3M Model 8012 Portable Field Service Kit, shown in Figure 1-3, is recommended as an effectivecountermeasure against static electricity.Figure 1-3 How to Handle Circuit CardsNote 1: A ground wire should be connected to the frame which is not coated by an insulating material.LOAD LAN1 LAN2PWR ACT ALM EMATxRx LINK TxRx LINKSV7000APEX TP/SLOAD LAN1 LAN2PWR ACT ALMTxRx LINK TxRx LINKSV7000APEX SP/SUP( )UP( )UP( )UP( )SP-234SP-234SP-234SP-234SN1234SN1234Connect ground wire tothe frame. Note 1Place the circuit card ona conductive sheet.wrist strapconductive sheetwrist strapConnectorBackboardcontact portionSet MB keyto UP.Card puller tabinstaller
