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Section IV.  ELECTROSTATIC DISCHARGE (ESD) AWARENESS
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TM-9-254 Gearcase Transfer M548 M548A1 (
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Table 8-8.  Device Type and Range of ESD Susceptibility (VOLTS)
TM 9-254 8-9. General Information - Continued Table 8-7.  Means of Static Charge Generation and the Associated Voltages - Continued MEANS OF STATIC GENERATION ELECTROSTATIC VOLTAGES WITH AND 10 - 20 % 65 - 90 % PERCENTAGE OF RELATIVE HUMIDITY RELATIVE RELATIVE HUMIDITY HUMIDITY VINYL ENVELOPES FOR WORK 7,000 600 INSTRUCTIONS COMMON POLY BAG PICKED UP 20,000 1,200 FROM BENCH WORK CHAIR PADDED WITH 18,000 1,500 POLYUREATHANE FOAM d. Prime  Charge  Carriers.    Personnel  are  the  prime  charge  carriers,  with  the  greatest  potential  of  damaging ESD items.  Activities such as walking, working at a table or bench, sliding on a chair, or simply combing one’s hair can generate static charges of thousands of volts with high potential for damage to sensitive devices. e. Items to Avoid.  The following items will generate sufficient charges to damage sensitive items:  All common plastics, spray cans, tape dispensers, heating guns, bubble pack, polystyrene cups, cigarette papers and wrappers, paint cans, stencil ink applicators, common poly bags and sheets, and plastic tape. 8-10. ESD Handling, Labeling and Packaging. a. Handling   Unpackaged   ESD      Sensitive   Items.      Never   store   or   transport   ESD   sensitive   components   or assemblies outside of the protective packaging.  The protective packaging should not be opened or removed until the item is to be installed in the next higher assembly.  At this time, the technician should be grounded in an approved work station. Avoid  touching  bare  leads  and  contacts  on  sensitive  material.    Never  use  plastic  solder  suckers  to  remove  soldered components from ESD sensitive assemblies.  Use metallic or antistatic solder removal means. b. Packaging  and  Labeling  ESD  Sensitive  Items/Assemblies.    After  replacement  of  a  sensitive  circuit  card assembly (CCA) or other subassembly into instrument, a CCA/sensitive item that is to be returned for repair must be Change 3  8-27

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