Repair information 4-1
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4. Repair information
Warning: Read the following before handling electronic parts.
Handling ESD-sensitive parts
Many electronic products use parts that are known to be sensitive to electrostatic (ESD). To prevent damage to ESD-
sensitive parts, use the following instructions in addition to all the usual precautions, such as turning off power before
removing logic boards:
• Keep the ESD-sensitive part in its original shipping container (a special “ESD bag”) until you are ready to install
the part into the machine.
• Make the least-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. Connect the wrist band to the system ground point. This discharges any
static electricity in your body to the machine.
• Hold the ESD-sensitive part by its edge connector shroud (cover); do not touch its pins. If you are removing a
pluggable module, use the correct tool.
• 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, first put it into its special bag.
• 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 personnel. Install machine covers when
you are not working on the machine, and do not put unprotected ESD-sensitive parts on a table.
• If possible, keep all ESD-sensitive parts in a grounded metal cabinet (case).
• Be extra careful in working with ESD-sensitive parts when cold-weather heating is used, because low humidity
increases static electricity.
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