Repair Information; Handling Esd-Sensitive Parts; Removal Procedures - Lexmark E250DN - Govt Laser 30PPM Special Build Mono Taa Service Manual

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 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 cards:
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Removal procedures

Note:
1.
Remove the toner cartridge and media tray before removing other printer parts. The toner cartridge should
be protected from light while out of the printer.
2.
We recommend disconnecting all external cables from the printer to prevent damage during service.
3.
Unless otherwise stated, reinstall the parts in reverse order of removal.
4.
When reinstalling a part held with several screws, start all screws before final tightening.
Keep the ESD-sensitive part in its original shipping container (a special "ESD bag") until the
part is ready to be installed into the printer.
Make the least-possible body movements 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 a
pluggable module is being removed, use the correct tool.
Do not place the ESD-sensitive part on the MFP cover or on a metal table; if the ESD-
sensitive part needs to be put down 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 the machine is not being worked on, 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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Repair information