Lexmark C734dn Service Manual page 365

Replace the LVPS.
7.
a. Install the LVPS, and make sure the cable is in the cable guides, and not behind the LVPS.
Reconnect the cable to the LVPS.
b.
c. Replace the five LVPS mounting screws.
Reconnect the cable in connector JLVPS1 on the system board.
d.
Replace the right cover.
8.
Slide the right cover up until it locks into position.
a.
Be sure the tab in the top access cover engages the slot in the right cover.
b. Replace the screw at the bottom of the rear frame cover.
Replace the two screws securing the right cover at the bottom.
c.
Replace the metal screw at the bottom on the inside front cover
d.
Replace the plastic screw at the top on the inside of the front cover.
e.
Replace the left cover, the rear left cover, and the paper tray dust cover.
9.
a. Place the paper tray dust cover into position.
Slide the cover down until it locks into place.
b.
Be sure the post in the top access cover engages the hole in the left cover, and that the post in the
paper tray dust cover engages the hole in the left cover properly.
c. Replace the taptite screw on the rear frame cover.
Replace the three screws on the left cover.
d.
Replace the rear frame cover.
10.
Replace the rear frame cover.
a.
Tighten the eight screws.
b.
11. Replace the rear upper cover (two screws).
Reinstall the transfer module with the photoconductor units still attached.
12.
Reconnect the transfer module cable.
13.
Replace the toner cartridges.
14.
Reinstall the fuser.
15.
16. Close the top access door.
Close the front access door.
17.
Replace the paper tray.
18.
Printhead alignment
Note: The printhead mounting screws should be initially tightened just enough to hold the printhead in the
printer.
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 after the printhead is installed, and black skew is adjusted using the alignment screw.
Skew (black)
Plug the electrical cord into the printer.
1.
2. Plug the electrical cord into the outlet.
The first step in aligning the printhead is to set the skew for black.
3.
Enter the Diagnostic menu (turn off the printer, press and hold
a.
release the buttons when the clock graphic displays).
b. Select REGISTRATION from the DIAGNOSTICS menu, and press Select (
Select Skew, and press Select (
c.
Use or to set the Skew to zero, and press Select (
d.
Press Back ( ).
e.
).
).
and , turn on the printer, and
).
Repair information
4-143
5026
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