Repair information 4-1
4500
4. Repair information
Warning: Read the following before handling electronic parts.
Handling electrostatic discharge (ESD)-
sensitive parts
Many electronic products use parts that are known to be sensitive to
electrostatic discharge (ESD). To prevent damage to ESD-sensitive
parts, follow the instructions below 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
printer.
• 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 printer.
• 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 printer 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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