Lexmark 4039 - B/W Laser Printer, Service Manual

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Repair Information
51
4039-1XX
Repair Information
This chapter explains how to make adjustments to the printer and
how to remove defective FRUs.
Handling 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
machine.
•
Make the least-possible movements with your body to prevent an
increase of static electricity from clothing fibers, carpets, and fur-
niture.
•
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 work-
ing 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.