IBM 2158240 Hardware Maintenance Manual - Page 135

Handling ESD-Sensitive Parts Many electronic parts are sensitive to electrostatic discharge (ESD). To prevent damage when working with ESD-sensitive parts, observe the following instructions. Do these in addition to taking all the usual precautions, such as switching off the power and unplugging the power cord. • Keep the ESD-sensitive part in its original shipping container (or special ESD bag) until you are ready to install the part. • Make the fewest possible movements with your body to prevent an increase of static electricity from clothing fibers, carpets, and furniture. • Put the ESD wrist strap on your wrist. Ensure the machine is turned off. Connect the wrist strap to the serial bracket mounting screw. This discharges any static electricity in your body to the machine frame. • Hold the ESD-sensitive part by its edge connector shroud (cover). Do not touch its pins. If you are removing a plug-able module, use the correct tools. • Do not place the ESD-sensitive part on the machine cover or on a metal table. If you need to put down the ESD-sensitive part for any reason, put it into it's original container. • Machine covers and metal tables are electrical grounds. They increase the risk of damage because they make a discharge path from your body through the ESD-sensitive part. (Large metal objects can be discharge paths without being grounded.) • Prevent ESD-sensitive parts from being accidentally touched by other persons. Reinstall machine covers when you are not working on the machine. • If possible, keep all ESD-sensitive parts in a grounded metal cabinet. • Be extra careful when working with ESD-sensitive parts while cold-weather heating is being used. Low humidity increases static electricity. Repair Information 103