Lexmark C520 Series, Service Manual

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Repair information
4-1
5022- xxx
4. Repair information
Removal and cleaning precautions
Observe the following precautions whenever you service the printer:
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Be sure to unplug the printer from the outlet before attempting to service the printer.
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To reassemble the printer, reverse the order of removal unless otherwise specified.
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Do not operate the printer anytime during removals. If it is absolutely necessary to run the printer with its
covers removed, use care not to allow your clothing to be caught in revolving parts such as the gears,
rollers and fan motor.
•
Never touch the terminals of electrical parts or high-voltage parts such as the high voltage power supply.
•
After part replacement, ensure the wiring harness is not caught or damaged.
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Do not attempt to cut or extend the wiring harness.
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Confirm the wiring harness connector is connected properly.
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Be sure to handle the fuser carefully as it remains hot for a while after the printer stops running. Always
unplug connectors by holding the connector housing.
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 electronic cards:
•
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.
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Hold the ESD-sensitive part by its edge connector shroud (cover); do not touch its pins.
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If you need to put down the ESD-sensitive part for any reason, first put it into its special bag.
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printer 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 printer
covers when you are not working on the printer, 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.