Lexmark CS748de, Service Manual

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Repair information
4-161
5026
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d. Reconnect the cable in connector JLVPS1 on the system board.
8. Replace the right cover.
a. Slide the right cover up until it locks into position.
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.
c. Replace the two screws securing the right cover at the bottom.
d. Replace the metal screw at the bottom on the inside front cover
e. Replace the plastic screw at the top on the inside of the front cover.
9. Replace the left cover, the rear left cover, and the paper tray dust cover.
a. Place the paper tray dust cover into position.
b. Slide the cover down until it locks into place.
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.
d.
Replace the three screws on the left cover.
10.
Replace the rear frame cover.
a.
Replace the rear frame cover.
b.
Tighten the eight screws.
11.
Replace the rear upper cover (two screws).
12.
Reinstall the transfer module with the photoconductor units still attached.
13.
Reconnect the transfer module cable.
14.
Replace the toner cartridges.
15.
Reinstall the fuser.
16.
Close the top access door.
17.
Close the front access door.
18.
Replace the paper tray.
Align the printhead
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.
1. Plug the electrical cord into the printer.
2. Plug the electrical cord into the outlet.
3. Align the printhead skew for black. Go through steps 13 to 18 on
page 4-10
for printhead alignment skew
for black on the C746 model, or go through steps 13 to 18 on
page 4-19
for printhead alignment skew for
black on the C748 model
4. Perform top margin alignment for black. Go to
page 4-13
for top margin alignment for black on the C746
model, or go to
page 4-23
for top margin alignment for black on the C748 model.
5.
Perform bottom margin alignment for black. Go to
page 4-13
for bottom margin alignment for black on the
C746 model, or go to
page 4-23
for bottom margin alignment for black on the C748 model.
6. Perform left margin alignment for black. Go to
page 4-14
for left margin alignment for black on the C746
model, or go to
page 4-24
for left margin alignment for black on the C748 model.
7.
Perform right margin alignment for black. Go to
page 4-14
for right margin alignment for black on the C746
model, or go to
page 4-24
for right margin alignment for black on the C748 model.
8. Perform alignment for cyan, yellow, and magenta. Go to
page 4-14
for cyan, yellow, and magenta
alignment on the C746 model, or go to
page 4-24
for cyan, yellow, and magenta alignment on the C748
model.