Lexmark MS71x, Service Manual

Page: 274 / 659

Step C
Print a copy of the Quick Test Page, and check the top and bottom alignment indicators printed on the test page. The
goal is to make the skew at the top and bottom of the page parallel. Depending on the skew, turn the screw either
clockwise or counterclockwise using a 3mm hex wrench, and print a copy of the Quick Test Page to check the diamonds
on the top and bottom margin. Continue adjusting the screw as you check the results of each adjustment on a new test
page until you obtain the results you want. One full 360-degree turn of the aligner screw will change the leading edge
skew by roughly 1mm (2 alignment indicator dots).
Go to the polygon printhead mechanical registration adjustment procedure when this step is complete. See “Polygon
printhead mechanical registration adjustment” on page 274 .
Polygon printhead mechanical registration adjustment
Complete the printhead mechanical registration adjustment procedure when you remove or replace the printhead, or
loosen the mounting screws.
Install the new printhead with the mounting screws lightly tightened before printing the registration Quick Test Page
to see if adjustment is needed. Before adjustment of the printhead, loosen each of the three mounting screws by a half
turn. This will leave the screws loose enough to allow the printhead to move within its slots as the adjustment screw
is rotated. If the adjustment plate was left alone during the laser printhead replacement, it will retain its position and
should minimize the amount of printhead mechanical registration adjustment needed. When the registration is set,
the three mounting screws should be tightened.
4063
Repair information
274