Lexmark C 746 Service Manual

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Using the touch screen buttons
Note:  Your home screen, icons, and buttons may vary depending on your home screen customization settings, 
administrative setup, and active embedded solutions.
Touch To
1 Up arrow Scroll up.
2 Delete folder Delete the file you selected.
3 Left arrow Scroll to the left.
4 Right arrow Scroll to the right.
5 Right scroll increase Scroll to another value in increasing order.
6 Left scroll decrease Scroll to another value in decreasing 
order.
7 Down arrow Scroll down.
1234
5678910 
						

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Understanding the home screen
When the printer is turned on, the display shows a basic screen, referred to as the home screen. Use the home 
screen buttons and icons to initiate an action.
Note:  Your home screen, icons, and the buttons may vary depending on your home screen customization 
settings, administrative setup, and active embedded solutions.8 Accept Save a setting.
9Cancel• Cancel an action or a selection.
• Cancel out a screen and return to the 
previous screen
10 Back Navigate back to the previous screen.
Touch To
1 Change Language Change the primary language of the printer.
2 Bookmarks Create, organize, and save a set of bookmarks (URLs) into a tree view of 
folders and file links.
Note: The tree view does not include bookmarks created within Forms and 
Favorites, and the ones in the tree are not usable in Forms and Favorites.
3 Held Jobs Display all current held jobs.
4 USB or USB 
ThumbdriveView, select, or print photos and documents from a flash drive.
Note: This icon appears only when you return to the home screen while a 
memory card or flash drive is connected to the printer.
5 Menus Access printer menus.
Note: These menus are available only when the printer is in the Ready 
state. Touch To
23
5678
4
123.123.123.123
1 
						

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This may also appear on the home screen:6 Status message bar • Show the current printer status such as Ready or Busy.
• Show printer conditions such as Fuser missing or Cartridge Low.
• Show intervention messages and the instructions on how to clear them.
7 Status/Supplies • Display a warning or error message whenever the printer requires 
intervention to continue processing.
• Access the messages screen for more information on the message, and 
how to clear it.
8 Tips Open a context.sensitive Help information on the touch screen.
Touch To
Search Held Jobs Search current held jobs.
Features
Feature Description
Attendance message alert If an attendance message affects a function, then this icon appears and the red indicator 
light blinks.
Warning If an error condition occurs, then this icon appears.
Printer IP address
Sample: 
123.123.123.123.123The IP address of your network printer is located at the top left corner of the home 
screen and appears as four sets of numbers separated by periods. You can use the IP 
address when accessing the Embedded Web Server so you can view and remotely 
configure printer settings even when you are not physically near the printer. Touch To 
						

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Administrative menus
Note:  Some menu items may not be available based on the printer model or the options installed.
1This menu appears only in touch.screen printer models
2Spending on the printer setup, this menu appears as a Standard Network, Wireless Network, or Network [x] Supplies Menu Paper Menu Reports Settings
Replace Supply Default Source Menu Settings Page General Settings
Cyan Cartridge Paper Size/Type Device Statistics Flash Drive Menu
Magenta Cartridge Configure MP Network Setup Page Print Settings1
Yellow Cartridge Substitute Size Network [x] Setup Page
Black Cartridge Paper Loading Profiles List
Cyan Photoconductor Custom Types Print Fonts
Magenta Photoconductor Custom Names
1Print Directory
Yellow Photoconductor Universal Setup Asset Report
Black Photoconductor
Waste Toner Bottle
Fuser
Transfer Module
Security Network/Ports Help
Miscellaneous Security 
SettingsActive NIC Print All Guides
Confidential Print Standard Network OR Network [x]
2Color Quality
Disk Wiping Standard USB Print Quality
Security Audit Log Parallel [x] Printing Guide
Set Date and Time Serial [x] Media Guide
SMTP Setup Print Defects Guide
Menu Map
Information Guide
Connection Guide
Moving Guide
Supplies Guide 
						

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Power-on self test (POST) sequence
When you turn the printer on, it performs a Power-On Self Test. Check for correct POST functioning of the base 
printer by observing the following:
1.The operator panel turns on and displays the Lexmark logo.
2.A progress bar displays.
3.The LED turns on.
4.The main fan turns on.
5.The machine performs the following tests:
a.Sensor check
b.Motor check—initializes the following motors:
i.Cam motor
ii.EP drive motor
iii.Fuser motor
iv.Cartridge motor
c.Supplies check
Note:  The LED blinks red and an error message displays on the operator panel screen if the machine 
detects errors during these test phases.
6.The LED light indicator blinks.
7.The loading screen displays.
Symptom tables
Printer symptom table
Symptom Action
Dead printer Go to “Dead printer service check” on page 2-124.
Operator panel—one or more buttons do 
not work.Go to “One or more operator panel buttons fail” on 
page 2-127.
Operator panel—display is blank. Printer 
sounds five beeps.Go to “Operator panel display blank, five beeps, and LED is 
off” on page 2-127.
Operator panel—display is blank.  Go to “Operator panel display blank, five beeps, LED on” on 
page 2-127.
Operator panel—stripes display, distorted 
display, and other display issuesGo to “Stripes display, distorted display, and other display 
issues” on page 2-128
Tray 1 missing Go to “Tray 1 missing service check” on page 2-135.
Tray linking will not work. Go to “Tray linking service check” on page 2-136.
Front cover locks, and will not open Go to “Front cover locked in place” on page 3-36. 
						

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Print quality symptom table
Symptom Action
Background Go to “Print quality—background” on page 2-129.
Blank page Go to “Print quality—blank page” on page 2-130.
Blurred or fuzzy print Go to “Print quality—blurred or fuzzy print” on page 2-132.
Half-color page Go to “Print quality—half-color page” on page 2-132.
Horizontal banding Go to “Print quality—horizontal banding” on page 2-132.
Horizontal line Go to “Print quality—horizontal line” on page 2-132.
Insufficient fusing Go to “Print quality—insufficient fusing” on page 2-132.
Missing image at edge Go to “Print quality—missing image at edge” on page 2-132.
Mottle (2–5mm speckles) Go to “Print quality—mottle (2–5mm speckles)” on 
page 2-132.
Narrow vertical line Go to “Print quality—narrow vertical line” on page 2-132.
Random marks Go to “Print quality—random marks” on page 2-133.
Residual image Go to “Print quality—residual image” on page 2-133.
Solid color page Go to “Print quality—solid color page” on page 2-133.
Vertical banding Go to “Print quality—vertical banding” on page 2-134. 
						

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User status and attendance messages
Error code   Action 
Close Front Door Close the front door securely. If you continuously get this error, then either the 24 V interlock 
switch or the 5 V interlock switch is bad. See “24 V interlock switch service check” on 
page 2-121 and “5 V interlock switch service check” on page 2-120.
Disk Corrupted, 
Reformat?The printer has attempted a disk recovery and cannot repair the disk. The disk must be 
formatted to use.
Warning: All files stored on the disk will be lost.
Held Jobs May Not Be 
RestoredThe printer has attempted to restore Held jobs, but not all were restored.
Insert Tray  Insert tray to clear the message.
Load 
Load paper in the indicated source and of the indicated type. Additional messages may 
include:
• Paper loaded—Select Continue.
• Show Me—the printer will present instructions.
• Cancel Job—the printer job can be canceled.
• Wait for supplies—If job parking is enabled, and the job meets all the requirements for 
allowing the job to be parted, the printer adds this message.
Load  
Load paper in the indicated source, and select Continue.
Additional messages may include:
• Show Me—the printer will present instructions.
• Cancel Job—the printer job can be cancelled.
• Wait for supplies—If job parking is enabled, and the job meets all the requirements for 
allowing the job to be parted, the printer adds this message.
Load   Load paper in the indicated source and of the indicated size, and select Continue.
Additional messages may include:
• Show Me—the printer will present instructions.
• Cancel Job—the printer job can be cancelled.
• Wait for supplies—If job parking is enabled, and the job meets all the requirements for 
allowing the job to be parted, the printer adds this message.
Load Manual If paper loaded is in the manual feeder, the job continues. If paper is not in the feeder, 
pressing Select indicates to the printer it should search for a source with the proper custom 
type.
Additional messages may include:
• Show Me—the printer will present instructions.
• Cancel Job—the printer job can be cancelled.
Load Manual 
If paper loaded is in the manual feeder, the job continues. If paper is not in the feeder, 
pressing Select indicates to the printer it should search for a source with the proper custom 
string.
Additional messages may include:
• Show Me—the printer will present instructions.
• Cancel Job—the printer job can be cancelled.
Load Manual  If paper loaded is in the manual feeder, the job continues. If paper is not in the feeder, 
pressing Select indicates to the printer it should search for a source with the proper size.
Additional messages may include:
• Show Me—the printer will present instructions.
• Cancel Job—the printer job can be cancelled. 
						

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Load Manual  
If paper loaded is in the manual feeder, the job continues. If paper is not in the feeder, 
pressing Select indicates to the printer it should search for a source with the proper type and 
size.
Additional messages may include:
• Show Me—the printer will present instructions.
• Cancel Job—the printer job can be cancelled.
Paper Changes Needed
PC Unit Exposure 
WarningThis warning occurs when the front door is left open too long. Close the front door to prevent 
damage to the PC unit. Select Tell me more for further information.
Remove All Color 
SuppliesIf Color Lockout mode is enabled, this message appears (unless the printer is in Diagnostics 
Menu or Configuration Menu).
Remove Paper 
Standard BinThe standard output bin is full. Remove the media to continue.
Remove Packaging 
MaterialIf packaging material is detected by the printer, Check all areas, Check , or 
Check  areas may appear. Press Select to continue.
Restore Held Jobs
Go/Stop?If the printer detects Print and Hold (or parked) jobs stored on the hard disk during Power-On 
Self Test (POST). Choices are:
• Restore—Print jobs are restored, and Restoring Held Jobs x/y, where x is the number 
of the job restored and y is the total number of jobs to restore. You can quit restoring, and 
the remainder of the jobs will remain on the disk, but cannot be accessed until they are 
restored at the next POR.
• Do not restore—Held jobs will remain on the disk, but cannot be accessed until they are 
restored at the next POR. Held jobs may not be restored appears.
• Tell me more—additional information is available
Securely Clearing Disk 
SpaceDisk wiping process is recovering disk space. The message clears when all memory blocks 
are cleared.
Tray Length Guide 
MissingReplace the tray length guide.
Unsupported USB 
device, Please RemoveRemove the unrecognized device to continue.
Unsupported USB hub, 
Please RemoveRemove the unrecognized device to continue.
Unsupported Mode Unplug camera and change it to a mode where the camera can access PictBridge. Plug the 
camera back in to continue.
Unsupported Disk Remove the unsupported disk to continue. Error code   Action  
						

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3x through 8x attendance messages
31 Defective or Missing 
 Cartridge• Reseat the specified toner cartridge.
• Inspect the smart chip card contacts (A) for damage, contamination or positioning error. If 
damaged, contact your next level of service.
• Inspect the toner cartridge contacts for damage/contamination. Replace the toner 
cartridge if defective.
• Replace the indicated cartridge.
• If the problem still exists, see “31.xx—Cartridge errors service check” on page 2-45.
32 Unsupported 
Cartridge• Check to see if the toner cartridge is a supported cartridge. 
Note: Once the cartridge shipped with the printer is exhausted, it must be replaced by a 
supply cartridge (refer to the User’s Guide for part numbers.)
If the specified toner cartridge is a supported cartridge, reseat the cartridge.
• Inspect the toner cartridge contacts for damage or contamination. Replace the toner 
cartridge if defective.
• Inspect JSBTN1 cable connection. Properly connect the cable if not connected properly. 
Replace the cable if damaged. 
• If the problem still exists, replace the system board. See “System board removal” on 
page 4-155.
34 Short Paper • Select Continue to clear the message and continue printing.
Note: The printer does not automatically reprint the page that prompted the message.
• Check the tray length and width guides to ensure the media is properly fitted.
• Make sure the print job is requesting the correct size of media.
• Adjust the Paper Size setting for the media size being used.
• If the MP Feeder Size is set to Universal, make sure the media is large enough for the 
formatted data.
• Cancel the current job. Replace the paper pick mechanism. See “Paper pick 
mechanism assembly removal” on page 4-137.
• If the problem still exists, replace the system board. See “System board removal” on 
page 4-155.
35 Insufficient memory 
to support Resource 
Save feature• Select Continue to disable Resource Save and continue printing.
• To enable Resource Save after receiving this message:
- Make sure the link buffers are set to Auto, then exit the menus to activate the link 
buffer changes. 
- When Ready is displayed, enable Resource Save.
• Install additional memory.
• If this does not fix the problem, replace the system board. See “System board removal” 
on page 4-155. Error code   Action 
A 
						

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37 Insufficient memory 
to collate job• Select Continue to print the portion of the job already stored and begin collating the rest 
of the job.
• Cancel the current job.
• If this does not fix the problem, replace the system board. See “System board removal” 
on page 4-155.
37 Insufficient memory 
for Flash Memory 
Defragment operation• Select Continue to stop the defragment operation and continue printing.
• Delete fonts, macros, and other data in printer memory.
• Install additional printer memory.
• If this does not fix the problem, replace the system. See “System board removal” on 
page 4-155.
37 Insufficient memory, 
Some Held Jobs Were 
Not Restored• The printer deleted some held jobs in order to process current jobs.
• Select Continue to clear the message.
• If this does not fix the problem, replace the system board. See “System board removal” 
on page 4-155.
37 Insufficient memory, 
Some Held Jobs Will 
Not Be Restored• The printer was unable to restore some or all of the confidential or held jobs on the hard 
disk.
• Select Continue to clear the message.
• If this message occurs again, replace the hard drive.
• If this does not fix the problem, replace the system board. See “System board removal” 
on page 4-155.
37 Insufficient Defrag 
MemoryThere is insufficient memory to perform the Flash Memory Defragment operation. The user 
can: 
• Delete font, macros, and other data in memory.
• Install additional printer memory.
38 Memory Full The following options are available:
• Select Continue to clear the message and continue printing. The job may not print 
correctly.
• Cancel the current job.
• Install additional printer memory.
• If this does not fix the problem, replace the system board. See “System board removal” 
on page 4-155.
39 Complex Page The page is too complex to print. Options are:
• Select Continue to continue. The job may not print correctly.
• Cancel the job.
• Additional memory may fix the problem.
50 PPDS Font Error • Select Continue to clear the message and continue printing. The job may not print 
correctly.
• Cancel the current job.
• If this does not fix the problem, replace the system board. See “System board removal” 
on page 4-155.
51 Defective Flash • Select Continue to clear the message and continue printing.
• Install different flash memory before downloading any resources to flash.
• If this does not fix the problem, replace the system board. See “System board removal” 
on page 4-155. Error code   Action