Lexmark C 746 Service Manual

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Tray 1 missing service check
Step Questions / actions Yes No
11. Check if the tray assembly can close 
properly.
2. Make sure the paper path is cleared of 
jams. 
3. Check for any damage.
Does the tray assembly close properly?Go to step 3. Go to step 2.
21. Clear the tray path of any obstruction. 
2. Check for damage on the tray.
Is the tray free of damage?Go to step 3. Replace the tray.
31. Remove the tray and inspect the narrow 
media flag on the...

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Tray linking service check
Tray linking is useful for large print jobs or multiple copies. When one linked tray is empty, paper feeds from the 
next linked tray. When the Paper size and Paper Type settings are the same for any trays, the trays are 
automatically linked.
Step Questions / actions Yes No
1Load the same size and type of paper in each 
tray. Move the paper guides to the correct 
positions for the paper size loaded in each 
tray.
Does tray...

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3.  Diagnostic aids
This chapter explains the tests and procedures to identify printer failures and verify repairs have corrected the 
problem.
Accessing test and diagnostic procedure menus
There are different test menus that can be accessed during POR to identify problems with the printer.
To run the printer diagnostic tests described in this chapter, you must put the printer in Diagnostics mode.Diagnostics menu 1. Turn off the printer.
2. Press and hold...

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Diagnostics menu
Note:  Tray 2 refers to the 550-sheet tray located in the 550-sheet option assembly.
Diagnostics menu structure
When the Diagnostics mode is entered, each Diagnostics main menu item displays on the operator panel. When 
a diagnostic test is selected from the main menu, a sub menu displays and each individual test displays in the 
order shown. Any options that are referred to in the menus are displayed when the option is installed.
Available...

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PRINT TESTS
Tray 1 See “Input source tests” on page 3-12.
Tray 2 (if installed)
Tray 3 (if installed)
Tray 4 (if installed)
Tray 5 (if installed)
Multi-Purpose Feeder
Print Quality Pages See “Print quality test pages (Print Quality Pages)” on page 3-13.
HARDWARE TESTS
Panel Test See “Panel Test” on page 3-14.
Button Test See “Button Test” on page 3-14.
DRAM Test See “DRAM Test” on page 3-14.
Serial 1 Wrap (if a serial port is 
available in the PCI slot 1)See...

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Servo Laser Test See “Servo Laser Test” on page 3-20.
DEVICE TESTS (if hard disk or flash is installed)
Quick Disk Test See “Quick Disk Test” on page 3-21.
Disk Test/Clean See “Disk Test/Clean” on page 3-22.
Flash Test See “Flash Test” on page 3-22.
PRINTER SETUP
Defaults See “Defaults” on page 3-22.
Prt Color Pg Count See “Page Counts” on page 3-23.
Prt Mono Pg Count
Perm Page Count
Serial Number See “Serial Number” on page 3-23.
Model Name See “Model Name”...

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Registration
Note:  If you need to perform alignment or registration, see “Printhead alignment” on page 4-8. 
The following information is meant to explain the uses for the menu items.
Print registration makes sure the black printing is properly aligned on the page. This is one of the steps in 
aligning a new printhead. It is also the first step in aligning the duplex registration. See “Quick Test (duplex)” 
on page 3-16. 
The settings available are Top...

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Print registration
Print registration (C746x)
To set print registration:
1.Select REGISTRATION from the Diagnostics Menu.
2.Select Quick Test.
The message Quick Test Printing… appears on the display.
Note:  Retain this page to determine the changes you need to make to the margin settings.
3.Use   or   to select the margin setting you need to change, and press  .
4.Use   to decrease or   to increase the offset values, and press   to confirm the value.
5.The...

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The print registration range is:
6.Continue changing the settings by repeating steps 2 through 4.
7.Print another copy of the Quick Test to verify your changes.
To exit without changing the value, touch Back. Description Value Direction of change
Skew -50 to +50 Each increment 
corresponds to 1/1200 of an inch.Skew settings should be between -5 
and +5. If not, readjust the skew 
with the printhead mechanical 
setting. See “Printhead 
alignment” on page...

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Quick Test
The Quick Test contains the following information:
•Print registration settings
•Alignment diamonds at the left, right, top and bottom
•Horizontal lines to check for skew
•General printer information, including current page count, installed memory, serial number, and code level.
Note:  Print the Quick Test Page on letter or A4 paper.
1.Select REGISTRATION from the Diagnostics Menu.
2.Select Quick Test.
The message Quick Test Printing… appears on...