Lexmark CS748de, Service Manual

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4-8
Service Manual
5026
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Adjustments
Printhead alignment
Overview
When aligning the printhead, it is important to keep in mind that the printhead mounting screws should be initially
loose enough to just hold the printhead in the printer. This allows the pages to be printed that will be used to
align the black plane to the printer frame and also allows skew adjustment with the printhead alignment screw.
Once the black skew is adjusted, the mounting screws are fully tightened.
There is one printhead that houses the four color planes. The black plane is aligned to the printer, and the color
planes are internally aligned to black. Electrical alignment is done to fine tune the alignment of the color planes
to the black plane once the printhead is installed and skew is adjusted.
The first step in aligning the printhead is to loosen the printhead mounting screws, and to set the skew for black.
Note:
If you need to replace the printhead, see
“Printhead removal, installation, and adjustment” on
page 4-153
.
Printhead mechanical alignment (C746)
Skew (black)
1.
Turn off the printer.
2.
Disconnect the power cord from the electrical outlet.
3.
Remove the transfer module and photoconductor units:
a.
Disconnect the transfer module cable (A).
b.
Press the two tabs (B) to release the front access cover assembly.
c.
Press the two tabs (C) on either side of the transfer module, and lift out the transfer module.
Note:
Leave the photoconductor units on the transport belt when removing.
To avoid damaging the photoconductor drum, place the transfer module with the photoconductor
units on a clean surface. Never expose the photoconductor units to light for a prolonged period of
time. You can place a clean, dry cloth over the transfer module and photoconductor units until they
are required.
B C
A