Repair information 4-1
4. Repair information
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, 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 Pin. 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.
Testing generic FRUs
The MF92x series MFP’s controller board and op panel can be tested after installation. When testing the board it
is critical that the machine only be PORd into Diagnostics mode. DO NOT POR THE MACHINE TO A READY
STATE. In Diagnostics mode, machine specific information is not written to the NVRAM on the replacement part.
To properly test a replacement generic FRU, perform the following steps:
1. Replace the faulty controller board.
2. Start the machine into diagnostics mode. See “Menu key combinations.” on page 3-1.
3. Turn the machine off.
4. If the replacement part is not the cause of the issue, remove the replacement part.
Y112730-2
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