Lexmark E 450 Dn Service Manual

							Diagnostic aids3-3
  4512-630
DUPLEX TESTS (if installed)
Quick Test See “Quick Test (duplex)” on page 3-16
Top Margin See “Top/Left Margin (duplex)” on page 3-16
Sensor Test See “Sensor Test (duplex)” on page 3-17
Duplex Feed 1 See “Duplex Feed 1” on page 3-17
INPUT TRAY TESTS
Feed Tests See “Feed Tests (input tray)” on page 3-18
OUTPUT BIN TESTS
Feed Tests See “Feed Tests (output bins)” on page 3-19
Sensor Test See “Sensor Test (standard output bin)” on page 3-19
BASE SENSOR TESTSee “BASE SENSOR TEST” on page 3-20
Exit
Front Door
Input
PRINTER SETUP
Defaults See “Defaults” on page 3-21
Page Count See “Page Count” on page 3-21
Perm Page Count See “Perm Page Count (permanent page count)” on page 3-21
Serial Number See “Serial Number” on page 3-21
Engine Setting 1 through 4 See “Engine Setting 1 through 4” on page 3-21
Model Name See “Model Name” on page 3-21
Configuration ID See “Configuration ID” on page 3-22
Edge to Edge See “Edge to Edge” on page 3-22
Par S Strobe Adj See “Parallel strobe adjustment (Par x Strobe Adj)” on page 3-22
Par x Strobe Adj (if additional 
parallel options are installed)
Diagnostics mode tests (continued) 
						

							3-4Service Manual 4512-630  
Exiting Diagnostics mode
Select Exit Diagnostics to exit the Diagnostics mode. Resetting the Printer displays, the printer 
performs a POR, and returns to normal mode.
REGISTRATION
Print registration makes sure the printing is printed properly aligned on the page.
The settings available are:
Bottom Margin
Top Margin
Left Margin
Right Margin
Quick Test
To set print registration:
1.Select REGISTRATION from the DIAGNOSTICS menu.
2.Select Quick Test, and press  .
To print the Quick Test page:
a.Press   until the   appears next to Quick Test. 
b.Press .
The message Quick Test Printing… appears on the display.
Retain this page to determine the changes you need to make to the margin settings. EP SETUP
EP Defaults See “EP Defaults” on page 3-23
Fuser Temp See “Fuser Temperature (Fuser Temp)” on page 3-23
Transfer See “Transfer” on page 3-23
Print Contrast See “Print Contrast” on page 3-23
Charge Roll See “Charge Roll” on page 3-23
Gap Adjust See “Gap Adjust” on page 3-23
EVENT LOG
Display Log See “Display Log” on page 3-24
Print Log See “Print Log” on page 3-24
Clear Log See “Clear Log” on page 3-25
EXIT DIAGNOSTICS
Diagnostics mode tests (continued) 
						

							Diagnostic aids3-5
  4512-630
3.Use   or   to select the margin setting you need to change, and press  .
The Top margin sign/value pair blinks. This indicates it is the margin value being changed.
4.Use   to decrease or   to increase the offset values, and press   to confirm the value.
The message Submitting selection displays, and the original REGISTRATION screen appears with 
the   beside the previously selected margin setting.
The print registration range is:
5.Continue changing the settings by repeating steps 2 through 4.
6.Print another copy of the Quick Test to verify your changes.
7.To exit REGISTRATION, press Back ().  T=xxx* B=xxx*
L=xxx* R=xxx*
Variable Description Value Direction of change
B= Bottom margin -20 to +20 Each increment causes 
approximately 0.55 mm shift in the 
bottom margin.A positive change compresses the 
image so it appears to move down 
the page and a negative change 
moves the image up. 
T= Top margin -25 to +25 Each increment causes 
approximately 4 pels shift (at 600 
dpi). A positive change moves the image 
down the page and increases the 
top margin. A negative change 
moves the image up and decreases 
the top margin.
L= Left margin -25 to +25 A positive change moves the image 
to the right, and a negative change 
moves the image to the left. No 
compression occurs.
R= Right margin -10 to +10 A positive change moves the image 
to the right, and a negative change 
moves the image to the left. 
						

							3-6Service Manual 4512-630  
Printhead assembly electronic adjustment
A step-by-step process to align a new printhead.
Note:  Before aligning the printhead electronically, first align the printhead mecahnically, if needed. See 
“Printhead assembly mechanical adjustment” on page 3-10
1.Press Go to print Step 1 test page. 
2.In column  of Step 1 test page, look for the position where the vertical lines are the closest to each 
other. Press to select the corresponding number (new setting).
3.Press and release to move to the  pattern on the right side of Step 1 test page. 
4.Press to select the  setting.
Step 1 printout
(sample only; use actual sheet) 
						

							Diagnostic aids3-7
  4512-630
5.Press Go to print Step 2 test page.
6.Press to change the  settings to the number beside the darkest portion of the vertical bar.
7.Press and release to move to the  settings on the right side of Step 2 test page.
8.Press to change the  settings to the number beside the darkest portion of the vertical bar.
Step 2 printout
(sample only; use actual sheet) 
						

							3-8Service Manual 4512-630  
9.Press Go to print Step 3 test page.
10.Press to change the  setting to the number beside the darkest portion of the vertical bar.
11.Press and release to move to the  settings on the right side of Step 3 test page.
12.Press to change the  settings to the number beside the darkest portion of the vertical bar.
Step 3 printout
(sample only; use actual sheet) 
						

							Diagnostic aids3-9
  4512-630
13.Press Go to print Visual alignment page.
14.Verify that the overall darkest line across the page is “0.” If not, then run the alignment again.
15.Turn the printer off to exit the printer alignment menu.
Visual alignment printout
(sample only; use actual sheet) 
						

							3-10Service Manual 4512-630  
Printhead assembly mechanical adjustment
A printhead needs to be correctly positioned after it has been removed. Align it to the frame or use the same 
position as the removed printhead. An indicator is located at the front right-hand screw for reference.
Note:  Skew is caused by a sheet being fed through the printer while misaligned. The entire image is rotated 
relative to the sheet edges. However, a mechanically misaligned printhead causes the horizontal lines to appear 
skewed while the vertical lines remain parallel to the vertical edges.
There are no adjustments for skew. Check the pick roll (paper pick assembly) for wear, the paper path for 
obstructions, the fuser for proper setting, and the tray paper guides for fit to the media.
To adjust the printhead:
1.Enter the Diagnostics Menu. See “Entering Diagnostics mode” on page 3-2. 
2.Select PRINT TESTS.
3.Select Tray 1.
4.Select Single.
5.Fold the printed test page on the left side so that a few millimeters of grid lines wrap around the outside of 
the fold. See photo below.
6.Fold a second vertical fold near the center so that the left side top edge aligns with the right side top edge.
Printhead
misalignmentPaper feedskew 
						

							Diagnostic aids3-11
  4512-630
7.If the grid lines of the right flap align below the corresponding lines on the left flap, adjust the printhead 
clockwise relative to the printer and recheck. (See the left side of the figure below.) If the grid lines of the 
left flap align below the corresponding lines of the right side, adjust the printhead counterclockwise. (See 
the right side of the figure below.)
8.After obtaining a properly adjusted image on the paper, tighten all three screws.
Note:  The printhead must be aligned electronically. See “Printhead assembly electronic adjustment” on 
page 3-6. 
						

							3-12Service Manual 4512-630  
Quick Test
The Quick Test contains the following information:
•Print registration settings
•Alignment diamonds at the top and bottom
•Horizontal lines to check for skew
•General printer information, including current page count, installed memory, serial number, and code level.
To print the Quick Test page:
Note:  Print the Quick Test Page on letter or A4 paper.
1.Select REGISTRATION from DIAGNOSTICS.
2.Press   until the   appears next to Quick Test.
The message Quick Test Printing… appears on the display.
Once the Quick Test Page completes printing, the Registration screen displays again.