Lexmark C736 Service Manual

							Repair information4-9
  5026
Go Back Previous
Next
4.Loosen the printhead mounting screws in the following order: D1, D2, and D3.
5.Remove the printhead alignment screw cover (E).
6.Reinstall the transfer module with the photoconductor units still attached.
7.Reconnect the transfer module cable. 
8.Replace the toner cartridges. 
9.Close the top access door. 
10.Close the front access door.
11.Plug the electrical cord into the printer.
12.Plug the electrical cord into the outlet.  
						

							4-10Service Manual 5026  
Go Back Previous
Next
13.Align the printhead skew for black. 
a.Enter the Diagnostic menu (turn off the printer, press and hold   and  , turn on the printer, and 
release the buttons when the clock graphic displays).
b.Select REGISTRATION from the DIAGNOSTICS menu, and press Select ().
c.Select Skew, and press Select ().
d.Use   or   to set the Skew to zero, and press Select ().
e.Press Back ().
f.Scroll down to Quick Test, and press Select  . A page similar to this one prints: 
						

							Repair information4-11
  5026
Go Back Previous
Next
g.Adjust the printhead alignment screw (G) to change the skew and straighten the image on the 
printout.
If the top right alignment marks are lower than the top left alignment marks, rotate the alignment 
screw counterclockwise a full revolution, and print the Quick Test page. Repeat adjusting the screw 
and printing the Quick Test until the top alignment marks are the same distance from the top of the 
media.
Note: One rotation of the printhead alignment screw equals approximately 0.5 millimeter movement 
of the top edge print alignment marks.
h.When the top right and top left alignment marks are both showing and are even on the page, the 
skew is aligned.
Straight Skewed 
						

							4-12Service Manual 5026  
Go Back Previous
Next
14.Tighten the printhead mounting screws.
a.Turn off the printer.
b.Disconnect the power cord from the electrical outlet.
c.Disconnect the transfer module cable. 
d.Press the two tabs on either side of the transfer module, and lift out the transfer module with the 
photoconductor units in place.
e.Remove all of the toner cartridges.
f.Tighten the printhead mounting screws in the following order: H1, H2, and H3.
15.Replace the printhead alignment screw cover.
16.Replace the toner cartridges. 
17.Reinstall the transfer module and the photoconductor units.
18.Connect the transfer module cable.  
						

							Repair information4-13
  5026
Go Back Previous
Next
Registration (black)
Top Margin
1.Reconnect the power cord to the electrical outlet, but do not turn on the printer yet.
2.Enter Diagnostic mode (press and hold   and  , turn on the printer, and release the buttons when the 
clock graphic displays).
3.Select REGISTRATION, and press Select .
4.Select Quick Test, and press Select   or use the last Quick Test you used to adjust skew.
5.Select Top Margin, and press Select .
6.Adjust the values until both top alignment marks are on the top edge of the print. 
•Increasing the value ( ) moves the top alignment marks down on the page. 
•Decreasing the value ( ) moves the top alignment marks up on the page. 
7.Press Select ( ) to save the value. 
8.Print the Quick Test page, and check the top alignment marks. Repeat adjustment of the top margin and 
printing of the Quick Test page until top margin is set.
Bottom Margin
1.Select Bottom Margin, and press Select . 
2.Adjust the bottom margin until the points of the bottom margin alignment marks are visible and touching 
the edge of the paper.
•Increasing the value ( ) moves the bottom alignment marks up on the page.
•Decreasing the value ( ) moves the bottom alignment marks down on the page.
3.Press Select ( ) to save the value. 
4.Print the Quick Test page, and repeat this process until the bottom margin is adjusted. 
						

							4-14Service Manual 5026  
Go Back Previous
Next
Left Margin
1.Adjust the left margin until the points of the left alignment marks touch the edge of the page.
•Increasing the value ( ) moves the left alignment marks away from the edge of the page.
•Decreasing the value ( ) moves the left alignment marks toward on the edge of the page.
2.Press Select ( ) to save the value. 
3.Print the Quick Test page, and check the left alignment marks each time until you are satisfied.
Right Margin
1.Adjust the right margin until the points of the left alignment marks touch the edge of the page.
•Increasing the value ( ) moves the right alignment marks away from the edge of the page.
•Decreasing the value ( ) moves the right alignment marks toward the edge of the page.
2.Press Select ( ) to save the value. 
3.Print the Quick Test page, and check the results. Repeat if necessary.
4.When the registration is complete, proceed to the color alignment.
Alignment (cyan, yellow, and magenta)
1.
Select Back ( ) until you reach the top menu.
2.Select ALIGNMENT MENU, and press Select ().
3.Select Cyan, and press Select (). 
4.Select Top Margin, and press Select ().
5.Use  and  to set Top Margin to zero, and press Select ( ) to save the value.
6.Do the same for Left Margin, Right Margin, Bottom Margin, Skew, and Bow. 
It is important to set all the values to zero before starting. 
						

							Repair information4-15
  5026
Go Back Previous
Next
7.Select Quick Test in the Cyan menu, and press Select ().
Two pages print. You may have to print these pages several times until you get T (Top Margin) and 
Z (Skew) aligned. Do not go to step 2 until T and Z are aligned. The first page is similar to the following: 
						

							4-16Service Manual 5026  
Go Back Previous
Next
8.Determine the line under Fine Adjustment that is closest. If the value is beyond the Fine Adjustment scale, 
use either of the Coarse Adjustment scales.
9.Enter the number determined from the Fine Adjustment scale or the Coarse Adjustment scales on the part 
of the page for the “T” value. The current value is automatically entered on the sheet. At this point, it should 
be zero.
10.Enter the “New Cyan T value” on the operator panel using the left and right arrows, and press Select () 
to save the value. 
11.Reprint the Quick Test, and evaluate whether you are at zero changes. 
-18 -18 
						

							Repair information4-17
  5026
Go Back Previous
Next
12.Repeat this process for skew (Z). Dont forget to subtract the T value and add the current cyan Z value to 
obtain the new skew (Z) value.
An example is shown below:
13.Continue to follow the directions on the bottom of the first page to find the Cyan Top Margin (T), the 
Skew (Z), and on the second page of the Quick Test page, the Left Margin (L), Right Margin (R), and 
Bow (P).
14.Repeat steps 2 through 11 for yellow and magenta.
Note:  Start each color group by setting the Top Margin, Left Margin, Right Margin, Bottom Margin, Skew, 
and Bow to zero.
-18 -18-18 -14 +4 
						

							4-18Service Manual 5026  
Go Back Previous
Next
Printer removal procedures
Precautions to take before maintenance work
Do not implement any operation, removal, or modification and so on, which is not presented in this manual. 
1.Turn the printer power off and unplug the power cable from the outlet prior to starting 
removals or checks.
2.Prior to starting any repairs, read and understand the warnings in this manual. 
•High temperature
•High voltage 
•Laser radiation
3.Confirm the direction of all parts and screw lengths during removal/replacement. 
4.Utilize the proper cleaning procedures/solvents during maintenance.
5.Confirm that all parts and covers are properly installed and assembled prior to starting the print test.