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Repair Information 4-1
4085-001
4. Repair Information
This chapter explains how to make adjustments to the printer and
how to remove defective parts.
CAUTION: Read the following before handling electronic parts.
When working on the printer, always unplug the printer from the
electrical outlet. High voltage is present in the power supply as long
as it is plugged into the electrical outlet.
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 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 engine
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.
• 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 careful in working with ESD-sensitive parts when cold weather heating
is used because low humidity increases static electricity.