Handling Esd-Sensitive Parts - Lexmark 7462 series Service Manual

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
8fibers, 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.
Model information used in the parts catalog
When replacing parts, always check the serial number label on the rear of the machine for the machine
type/model number. Match the machine type/model number with the machine type model that is referenced
in the parts catalog for the part being replaced. There is also a label inside the front door of the machine.
Polygon printhead mechanical registration adjustment
Do the printhead mechanically registration adjustment whenever you remove or replace the printhead or loosen
the mounting screws.
Install the new printhead with the mounting screws centered in the slots in the printhead frame assembly. Leave
the screws loose enough to allow the printhead to move from side to side within the slots. It is necessary to
perform a mechanical registration adjustment before locking down the three printhead mounting screws.
Note: In the case of paper feed skew, go to
1
Turn the printer off.
2
Press and hold 3 and 6 to enter the diagnostic mode.
Turn the printer on, and release the buttons when Performing Self Test displays.
3
4
Select Registration from the menu.
"Alignment assembly adjustment" on page
Repair information
304
7462
305.