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Repair Information 4-1
4078-00X
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.
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 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 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 cor-
rect 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 rea-
son, 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 dis-
charge paths without being grounded.)
• Prevent ESD-sensitive parts from being accidentally touched by other
personnel. Install machine covers when you are not working 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.