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Repair Information 4-1
4090-001
4. Repair Information
This chapter explains how to make adjustments to the printer and
how to remove defective parts.
Note: Read the following before handling electronic parts. When
working on the printer, always unplug the printer from the wall outlet.
High voltage is present in the power supply as long as it is plugged
into the wall 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 pre-
cautions, 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 cor-
rect 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 dis-
charge 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.