APPENDIX H Electrostatic Discharge (ESD) PracticesOEM7 Installation and Operation User Manual v4 233l Do not allow chargeable plastics, such as binders, within 0.6 m of unshielded PCBs.l Do not allow a PCB to come within 0.3 m of a computer monitor.H.2 Prime Static AccumulatorsTable 62: Static-Accumulating Materials below provides some background information on staticaccumulating materials.Work Surfacesl formica (waxed or highly resistive)l finished woodl synthetic matsl writing materials, note pads and so onFloors l wax-finishedl vinylClothesl common clean room smocksl personal garments (all textiles)l non-conductive shoesChairsl finished woodl vinyll fiberglassPacking and handlingl common polyethylene bags, wraps, envelopes andbubble packl pack foaml common plastic trays and tote boxesAssembly, cleaning and repairareasl spray cleanersl vacuum desoldering ironl common soldering ironsl common solvent brushes (synthetic bristles)l cleaning, drying and temperature chambersTable 62: Static-Accumulating MaterialsH.3 Handling Printed Circuit BoardsESD damage to unprotected sensitive devices may occur at any time. ESD events can occur farbelow the threshold of human sensitivity. Follow this sequence when it becomes necessary toinstall or remove a circuit board:1. After you are connected to the grounded wrist strap, remove the circuit board from theframe and place it on a static controlled surface (grounded floor or table mat).2. Remove the replacement circuit board from the static-shielding bag or clamshell and insert itinto the equipment.
