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Repair information 4-1
5056-XXX
Repair information
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, use the following instructions 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 correct 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 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 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.
Service precautions
Observe the following precautions whenever you service the printer:
• Be sure to unplug the printer from the outlet before attempting to service the printer.
• To reassemble the printer, reverse the order of disassembly unless otherwise specified.
• Do not operate the printer anytime during disassembly. If it is absolutely necessary to run the printer with
its covers removed, do not 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 HVPS (high voltage power
supply) board.
• 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.
• Be sure to use the fuse listed in the parts catalog.
• Do not forget to install the ground wire or ground plate to ensure positive conduction. Install the screw with
a toothed washer in the correct position at reassembly.