Controller/Microprocessor Service Precautions

Take precautions to prevent electrostatic discharge when servicing the controller or microprocessor and its related components. Even tiny amounts of current can severely damage or destroy electronic components.

Observe the following precautions when servicing a controller or microprocessor control system to avoid damaging electronic components. Refer to the applicable unit, controller, or microprocessor diagnostic manual for more information.

• If the unit has a service or microprocessor ON/OFF switch, turn it OFF before connecting or disconnecting the battery.

• Disconnect power to the unit.

• Avoid wearing clothing that generates static electricity (wool, nylon, polyester, etc.).

• Wear a wrist strap (PN 2040622 or equivalent) with the lead end connected to the microprocessor or unit ground terminal (if equipped). These straps are available from most electronic equipment distributors. DO NOT wear these straps with power applied to the unit.

• Avoid unnecessary contact with the electronic components.

• Store and ship electronic components in antistatic bags and protective packaging.

• Leave electronic components in their antistatic packing materials until you’re ready to use them.

• After servicing any electronic components, check the wiring for possible errors before restoring power to the unit.

• Never use a battery and a light bulb to test circuits on any controller or microprocessor-based equipment.