Lexmark 13P0150 - C 750dtn Color Laser Printer, Service Manual

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Repair Information
4-1
5060-XXX
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, 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 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.
Printhead Adjustments
Whenever a printhead is removed, it is necessary to perform the “Printhead Manual
Adjustment” on page 4-1 and “Printhead Electronic Alignment” on page 4-4 .
Printhead Manual Adjustment
1.
Draw a scribe line on the frame next to the front (A) and rear (B) of the printhead to
provide reference points before adjusting or removing a printhead.
Note: When you adjust or replace the printhead, tighten the three mounting screws
friction tight so the printhead does not wobble but can be adjusted left and right.