What must be done to J1 of each live PAC2 GM immediately after the cable connection is disconnected to eliminate static charge?

To eliminate static charge from J1 of each live PAC2 GM after the cable connection is disconnected, the correct procedure is to connect shorting plugs. This act is critical because shorting plugs are specifically designed to safely discharge any residual static electricity that may be present in the wiring or connectors, thus protecting both the equipment and personnel from potential electric shock or equipment damage.

The process of connecting shorting plugs ensures that electrical pathways are safely grounded, thereby reducing the risk of accidental discharge. This is particularly important in environments where sensitive electronic components might be exposed to static electricity, which can interfere with operation or damage the internal circuitry.

Other options like touching a grounded metal surface or storing the component in a protective case do not directly address the need to discharge static charge effectively. Covering with an insulated cap does not prevent static build-up and does not offer an effective means of discharging any existing charge. Therefore, using shorting plugs is the best and most appropriate method for ensuring safety and proper handling of the PAC2 GM after disconnecting the cable.