Lexmark C 746 Service Manual

							Diagnostic aids3-29
 5026
Go Back Previous
Next
Reports
Menu Settings Page
The Menu Settings Page generates a list of Configuration Menu settings and the current values.
Event Log
This menu item lets the system support person print a limited set of the information contained in the Diagnostics 
mode version of the printed Event Log. For a sample of a Diagnostics Menu Event Log printout, see “Event 
Log” on page 3-25. The limited Configuration log and the full Diagnostics log printed versions show the same 
operator panel messages when they print and follow the same layout guidelines. 
To print the Event Log:
1.Select EVENT LOG from the Configuration Menu
2.Select Print Log to begin printing the log.
Note:  If an optional parallel card is supported and installed, then after the Event Log prints, a separate report 
prints that details the parallel card’s history.
Color Trapping
Uses an algorithm to compensate for mechanical misregistration in the printer. When small black text or fine 
black lines are being printed, the printer checks to see if they are being printed on top of a colored background. 
If so, rather than remove the color from beneath the black content, the printer leaves the color around the edge 
of the text or line. The hole in the colored region is reduced in size which prevents the characteristic white gap 
that is caused by mis-registration.
This menu item applies to PCL 5e emulation, PCL XL, PDF, and PostScript.
Selections are Off and the values 1 through 5, with 2 as the default. Values 1 through 5 indicate the amount of 
color remaining beneath the black content. Each setting increments by 1/600 of an inch. The less accurate the 
registration setting, the higher the setting needs to be adjusted. Selecting Off disables color trapping. The 
default value is 2.
Tray Insert Msg
This setting determines how many seconds the panel will display the Tray Insert message after inserting a tray 
into the printer.
Selections are Disabled and the values between 1 and 90. The default value is 5.
Panel Menus
Lets the system support person turn enable or disable the operator panel Administration Menu. Selecting On 
(the default) prevents users from changing values for the printer. Off allows users to changes the values. The 
default value is set to On.
This menu item only appears when the PJL PASSWORD Environment variable is set to 0. 
						

							3-30Service Manual 5026 
Go Back Previous
Next
PPDS Emulation
Activates or deactivates (default) the Personal Printer Data Stream (PPDS) emulation language. This menu item 
only appears if the PPDS interpreter is available.
Download Emuls
This menu item allows the system support person turn the download emulator off temporarily. This menu item 
only appears if at least one download emulator is installed.
The only selection is Disable. The printer automatically re-enables all download emulators after two instances of 
a power-on reset for the printer. To re-enable these emulators, a user would perform another power-on reset 
after exiting the Config Menu. 
Demo Mode
This menu item allows marketing personnel or merchandisers demonstrate the printer to potential customers by 
printing the demo page.
Selections include Deactivate (default) and Activate. Select Deactivate to turn Demo Mode off; or select 
Activate to turn Demo Mode on.
Factory Defaults
This menu item resets the majority of printer values back to their factory default settings. 
Warning:This selection cannot be reversed, so this operation should only be used as a last resort to fix any 
printer problem. 
When factory default settings are restored:
•All downloaded resources (fonts, macros, symbol sets) in the printer memory (RAM) are deleted.
•All menu settings return to the factory default setting except:
–The Display Language setting in the “Setup” Menu.
–All settings in the Parallel Menu, Serial Menu, Network Menu, Infrared Menu, LocalTalk Menu, and 
USB Menu.
Selections are Restore Base and Restore STD NET. The Restore Network value only appears on printer 
models that have integrated network support.
Restoring Factory Defaults appears on the operator panel while factory defaults are restored.
Energy Conserve
This menu item affects the values that appear in the Power Saver menu on the operator panel. Energy 
Conserve only appears when the Power Saver feature is disabled. 
Select Off in Energy Conserve to add a menu item to the Power Saver called Disabled. Energy Conserve does 
not disable Power Saver, it only allows the users to select Disable. When On (default) is selected in the Energy 
Conserve menu Disabled does not appear on as a choice in the Power Saver menu. Power Saver cannot be 
disabled from the user‘s operator menu. 
						

							Diagnostic aids3-31
 5026
Go Back Previous
Next
Automatic Color Adjust
Sets the suggested number of pages which the printer should print between consecutive calibrations.
Selections are Off and the values between 100 and 1000 in increments of 50. The default is 500 pages.
If the printer exceeds the set value while printing a job, it completes the current job and any other jobs received 
while printing the current job before it initiates a calibration. The printer does not cancel or suspend an active job 
in order to perform a calibration. If a user is in any of the menus, including the Configuration Menu and the 
Diagnostics mode, an automatic color adjust calibration does not occur.
Auto Align Adj
Controls whether the printer executes the automatic alignment calibration after an initiating event occurs. When 
an event initiates a TPS operation, the printer performs a toner density calibration, (TPS) an alignment 
calibration, or both of the calibrations.
Toner Patch Sensing (TPS) is a diagnostic mechanism that automatically adjusts the printer toner density and 
alignment settings. When TPS executes, the printer generates toner patches on the transfer module. It then 
uses these to calculate the appropriate adjustment, to density, if necessary.
Selections are On (default) and Off. Turning this setting to Off is not recommended for normal operation 
because it prevents the printer from using the results of automatic color calibration and automatic alignment to 
make minor adjustments. Eventually, the user will have to manually correct alignment and color on the printer.
Color Adj State
These settings allow you to select when color calibrations occur. Selecting Busy indicates the color calibrations 
will complete queued jobs, but refuse to add new jobs to the queue. When calibration is complete jobs are again 
accepted. Selecting Idle allows calibrations only when the printer is idle.
Enforce Color Order
This setting gives the system support person the ability to enforce where the color cartridges may be placed, 
and if messages appear when cartridges are in the wrong location. 
When On (default) is selected, the printer lets users place each toner cartridge in only its specified slot. For 
instance, the Magenta toner cartridge must be in the Magenta slot. If the user tries to place a cartridge in an 
incorrect slot, the printer message 31 Defective or Missing  Cartridge or 32 Unsupported  
Cartridge appears where  stands for Cyan, Magenta, Yellow, or Black.
When Off is selected, the printer does not issue any message to let the user know that the cartridge is placed in 
the wrong slot inside the printer.
Color Alignment
Color alignment should be performed when the printhead may become misaligned because it was removed or 
replaced. Perform Color Alignment when a new transfer belt assembly is installed.
To perform color alignment:
1.Select Color Alignment from the Configuration Menu.
2.Select Print Alignment Page.
3.Select Set A.
Consulting the printed page, follow the instructions on the operator panel to choose the best appearing line 
numbered 0 through 20 for line A. 
Continue selecting the best lines for the sets through Set L.  
						

							3-32Service Manual 5026 
Go Back Previous
Next
Motor Calibration
This test is run to calibrate the leading edge of the paper to each transfer station. 
1.Select Motor Calibration from the Configuration Menu.
2.Calibrating displays, and the printer prints eight blank pages and then returns to the Configuration Menu.
Note:  This test should be run at 600 dpi resolution and with duplex disabled.
Paper Prompts
Controls the source the printer selects for a change paper source message. The printer displays the change 
paper source message based on the size of the paper requested and not by the paper type.
Selections include Auto, Multi-Purpose Feeder, and Manual Paper. 
Note:  Multi-Purpose Feeder is only available on some printer models.
Note:  If the Configure MP setting is changed to Manual, a power-on reset is performed, and the value of the 
Paper Prompts menu item before the power-on reset was Multi-Purpose Feeder, then when the printer restarts, 
the printer automatically changes the Paper Prompts setting to Manual Paper.
Load Manual overrides that would result in a change paper message are disabled for Paper or Envelope 
prompts that are set to Manual, Manual Paper, or Manual Envelope.
Envelope Prompts
Controls the source the printer selects for a change envelope source message. The printer displays the change 
envelope message based on the size of the envelope requested and not by the envelope type.
Selections include Auto, Multi-Purpose Feeder, and Manual Envelope. 
Note:  Multi-Purpose Feeder is only available on some printer models.
Note:  If the Configure MP setting is changed to Manual, and a power-on reset is performed, and the value of 
the Envelope Prompts menu item before the power-on reset was Multi-Purpose Feeder, then when the printer 
restarts, the printer automatically changes the Envelope Prompt setting to Manual Envelope.
Load Manual overrides that would result in a change paper message are disabled for Paper or Envelope 
prompts that are set to Manual, Manual Paper, or Manual Envelope.
Action for Prompts
This setting gives the user the option of having the printer resolve change prompt situations without requiring 
any user assistance. If the Prompt user value is selected, the printer displays change prompts if the job does 
not match the media in the selected source. The user must select another source or change the paper. If 
Continue or Use current is selected, the printer acts as if the user made the selection Continue or 
Use current and continues without user intervention, in most cases.
Jobs on Disk
Lets the user select whether or not the printer deletes all buffered jobs on the hard disk. This menu item only 
appears if a hard disk is installed. It appears even if no buffered jobs exist on the hard disk.
Selections include Do Not Delete and Delete.
Note:  Delete does not remove Print and Hold jobs. Use Remove Held Jobs in the Utilities Menu (user menu) 
to delete these jobs. 
						

							Diagnostic aids3-33
 5026
Go Back Previous
Next
Disk Encryption
Controls whether the printer encrypts the information that it writes to the hard disk.
Warning:When the value for Disk Encryption, the printer completely formats the hard disk which means that all 
information on the disk is deleted.
Note:  If an encrypted disk is removed from the printer and another disk is installed, the Disk Corrupted. 
Reformat? message appears. The newly installed disk must either be formatted or removed from the printer.
Selections include Disable (default) and Enable. When Disk Encryption is selected, Yes or No appears for you 
to confirm. Select either Yes or No to continue. To cancel, select No.
The Disk Encryption menu item only appears when:
•A non-defective disk is installed in the printer.
•The values of bits 3-2 of digit 4 in the Configuration ID 2 are either 01 for Supported, or 10 for Supported 
with an internal network adapter (INA).
A graphic appears, showing:
•The message Encrypting Disk or Formatting Disk 
•A percentage scale
•The message DO NOT POWER OFF 
The process is complete when the percentage scale displays 100.
Wipe Disk
Note:  Due to the lengthy amount of time required to wipe an entire hard disk using either method, a wipe should 
not be initiated unless it is absolutely unavoidable (for example, disk corruption), or unless the printer can 
remain offline for several hours without inconveniencing users.
Warning:A user should not initiate either type of wipe from the Configuration Menu if the hard disk contains 
downloaded fonts, macros, held jobs, and so forth that should not be erased.
This setting initiates either a single pass wipe or a multiple pass wipe of the entire hard disk. Select Disk Wipe 
(fast) to complete a single pass wipe and replacement of the file system. Select Disk Wipe (secure) to 
complete a multiple pass wipe at a more basic level.
Wipe All Settings
The purpose of this setting is to make any sensitive information that may exist on the device’s volatile or non-
volatile storage completely indecipherable.
After selecting this setting, the operator panel displays the following message:
This operation will clear all settings, solutions, and jobs on this device. The device will 
reboot during this process. Continue?
To cancel the NAND wipe operation and return to the main Configuration Menu, select No. To execute the 
NAND wipe operation, select Yes.
After selecting Yes, the device initiates a non-critical NVRAM reset, and the operator panel displays the 
message Resetting the device, and then the device reboots. 
The progress bar area of the Lexmark logo screen that appears during boot up displays the following message 
until the wiping process is finished:
Wiping disk...Pass [x] of [y]. [Z]% done. 
						

							3-34Service Manual 5026 
Go Back Previous
Next
Duplex Gloss
Generates higher quality duplex copies than when using the normal duplex mode. The major difference between 
normal duplex and duplex gloss mode is the number of sheets in the duplex print media path. Normal duplex 
mode feeds two sheets simultaneously, while duplex gloss feeds only one sheet.
Selections include Off (default) and On.
Font Sharpening
Lets a user set a text point-size value below the setting of the high frequency screens used when printing font 
data. This menu item only affects the PostScript, PCL, XL, and PDF emulators.
Settings are in the range of 0–150 (24 is the default). For example, if the value is set to 24, then all fonts sized 24 
points or less use the high frequency screens.
Require Standby
When set to Off, the Standby Mode setting in the General Settings Menu displays a Disabled value.
UI Automation
This setting allows external developers to measure the stability of their applications by performing their own 
automated testing against the device.
Selections include Enable and Disable (default).
When Enable is selected, the machine creates a file called ENABLE_UI_AUTOMATION in the /var/fs/shared/ 
directory. As long as this file exists, the device permits automated testing by external users.
When Disable is selected, the machine removes the ENABLE_UI_AUTOMATION file from the /var/fs/shared/ 
directory and prohibits automated testing.
Key Repeat Initial Delay
This determines the initial length of delay before a repeating key starts repeating.
The selection values are from 0.25 to 5.00 with 0.25 second increments. The default value is 1.00.
Key Repeat Rate
This determines the value for the number of presses per second for a repeating key. 
The selection values are from 0.5 to 100.0 with 0.5 second increments. The default value is 15.0.
Clear Custom Status
This operation erases any strings that have been defined by the user for the Default or Alternate custom 
messages.
USB Speed
Full or Auto (default). 
						

							Diagnostic aids3-35
 5026
Go Back Previous
Next
Automatically Display Error Screens
Selections include On (default) and Off (default).
When On is selected, the operator panel automatically displays any existing printer-related IR after the device 
remains inactive on the Home screen for a length of time equal to the Screen Timeout setting. Any IR that 
appears on the operator panel will display the option to return to the Home screen without clearing it. Once the 
device returns to the Home screen, though, any existing IR again will appear after the device remains inactive 
on the Home screen for a length of time equal to the Screen Timeout setting. 
Note:  SFPs and MFPs use a different default value for this setting in order to preserve their legacy behavior 
with respect to IRs.
Exit Config
Exits the Configuration Menu. The printer performs a power-on reset and returns to normal mode. 
						

							3-36Service Manual 5026 
Go Back Previous
Next
Front cover locked in place
The front door locks during certain Busy events, and unlocks when those events are complete. This is a normal 
function. You can hear the door lock into place when one of these events take place. However, if the printer is 
turned off, or has an error while the front door is locked (for example, while printing or calibrating), the front door 
may not unlock. If this happens, turn the printer off, and restart it. Once it goes through POR, it may unlock itself. 
If this does not work, use the following procedure to unlock the front door:
1.Remove the two screws (A) from the rear upper cover, and remove the cover.
2.Remove the two screws (B) from the rear left cover. 
						

							Diagnostic aids3-37
 5026
Go Back Previous
Next
3.Press the waste toner release latch (C), swing the front of the waste toner assembly away from the printer, 
and remove. 
4.Remove the two screws (D) on the bottom and one screw higher up (E).
5.Press the locking tab (F).
DE
F 
						

							3-38Service Manual 5026 
Go Back Previous
Next
6.Lift the rear of the left cover out, and rotate it out of position. 
Note:  It will not come completely off with the front cover locked.
7.With a flatblade screwdriver, turn the camshaft counterclockwise until the door unlocks.
8.Open the front cover.