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Repair information
Removal precautions
CAUTION—SHOCK HAZARD: For personal safety and to prevent damage to the printer, remove the power cord
from the electrical outlet before you connect or disconnect any cable, electronic board, or assembly. Disconnect
any connections between the printer and the PCs/peripherals.
CAUTION—POTENTIAL INJURY: The printer weight is greater than 18 kg (40 lb) and requires two or more
trained personnel to lift it safely
Data security notice
1 This printer contains various types of memory that are capable of storing device and network settings, information
from embedded solutions, and user data. The types of memory, along with the types of data stored by each, are
described below.
• Volatile memory—This device utilizes standard Random Access Memory (RAM) to temporarily buffer user data
during simple print and copy jobs.
• Non-volatile memory—This device may utilize two forms of non-volatile memory: EEPROM and NAND (flash
memory). Both types are used to store the operating system, device settings, network information, scanner and
bookmark settings, and embedded solutions.
• Hard disk memory—Some devices have a hard disk drive installed. The printer hard disk is designed for device-
specific functionality and cannot be used for long term storage for data that is not print-related. The hard disk
does not provide the capability for users to extract information, create folders, create disk or network file shares,
or transfer FTP information directly from a client device. The hard disk can retain buffered user data from
complex print jobs, as well as form data and font data.
To erase volatile memory, turn off the printer.
To erase non-volatile memory, see the menu item under
To erase the printer hard disk, see the menu item under
The following parts are capable of storing memory:
“Configuration menu” on page 356 pertaining to this.
“Configuration menu” on page 356 pertaining to this.
• printer control panel
• UICC (User Interface Controller Card)
• controller board
• optional hard drives
Note: The printer control panel and controller board contain NVRAM.
2 After removing the old part, it must be returned to your next level of support.
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Handling ESD‑sensitive parts
Many electronic products use parts that are known to be sensitive to electrostatic discharge (ESD). To prevent damage
to ESD-sensitive parts, use the following instructions in addition to all the usual precautions, such as turning off power
before removing logic boards:
• Keep the ESD-sensitive part in its original shipping container (a special “ESD bag”) until you are ready to install the
part into the machine.
• Make the least-possible movements with your body to prevent an increase of static electricity from clothing fibers,
carpets, and furniture.
• Put the ESD wrist strap on your wrist. Connect the wrist band to the system ground point. This discharges any static
electricity in your body to the machine.
• Hold the ESD-sensitive part by its edge connector shroud (cover); do not touch its pins. If you are removing a
pluggable module, use the correct tool.
• Do not place the ESD-sensitive part on the machine cover or on a metal table; if you need to put down the ESD-
sensitive part for any reason, first put it into its special bag.
• Machine covers and metal tables are electrical grounds. They increase the risk of damage, because they make a
discharge path from your body through the ESD-sensitive part. (Large metal objects can be discharge paths without
being grounded.)
• Prevent ESD-sensitive parts from being accidentally touched by other personnel. Install machine covers when you
are not working on the machine, and do not put unprotected ESD-sensitive parts on a table.
• If possible, keep all ESD-sensitive parts in a grounded metal cabinet (case).
• Be extra careful while working with ESD-sensitive parts when cold-weather heating is used, because low humidity
increases static electricity.
Controller board/control panel replacement
This procedure should be followed only if both the controller board and the control panel fail. If you need to replace
only one of the FRUs, follow the startup procedure described in the FRU’s removal procedure.
CAUTION—POTENTIAL INJURY
The lithium battery in this product is not intended to be replaced. There is a danger of explosion if a lithium
battery is incorrectly replaced. Do not recharge, disassemble, or incinerate a lithium battery. Discard used
lithium batteries according to the manufacturer's instructions and local regulations.
Warning—Potential Damage: If the control panel and the controller board are being replaced at the same time,
replace the parts in this order to avoid damage to the machine.
1 Replace the controller board first.
Note: Do not replace the new control panel and controller board in the machine at the same time.
2 After installing the new controller board, and before installing the new control panel, start the printer into
diagnostics mode.
3 After the printer has completed startup, turn off the printer and replace the control panel.
Note: If the control panel display has failed, the printers’ startup cycle is complete when the driver motor and
fans shut down, and the machine is quiet.
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4 After installing the new control panel, start the printer into diagnostics mode, and allow the printer to go through
a complete startup cycle and the display to go to Ready.
5 If the problems persist, leave the new control panel in the machine, place the old controller board back in the
machine, and start it up. After the machine startup, shut down the machine, and install the new controller board.
After installing the new controller board, restart the machine, and let it go through the startup cycle.
After this procedure is completed successfully, there is no need to adjust any settings.
If the above procedure fails, you must contact the technical support center for further instructions.
Restoring the printer configuration after replacing the controller board
Restore the printer to its correct configuration to complete the replacement service. Use the Service Restore Tool to
download the software bundle, and then flash the printer settings and Embedded Solutions.
Note: The software bundle contains the latest version of the firmware, applications, and software licenses from the
Lexmark Virtual Solutions Center (VSC). The printer firmware may be at a different level from what was used before
replacing the controller board.
Using the Service Restore Tool
Go to https://cdp.lexmark.com/service-restore-tool/ to access the tool.
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2 Log in using your Lexmark or partner login.
If your login fails, then contact your next level of support.
3 Enter the printer serial number, and then submit the information.
Note: Make sure that the serial number that appears on the verification screen is correct.
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4 Save the zip file.
Note: Make sure that the serial number in the zip file matches the serial number of the printer being restored.
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5 Extract the contents of the zip file, open the Readme file, and then follow the instructions in the file.
Notes:
• Perform the install instructions on the Readme file in the exact order shown. Only restart the printer when
instructed to in the file.
• For more information on how to flash the downloaded files, see “Updating the printer firmware ” on
page 377.
• To load the zip files that are extracted from the Service Restore Tool, see “Restoring solutions, licenses, and
configuration settings” on page 376.
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6 After performing the installation instructions in the Readme file, confirm from the customer if all the eSF apps have
been installed.
Notes:
• If you are unable to access the administrative menus to verify that the printer is restored, then ask the
customer for access rights.
• If a 10.00 error is displayed after you restart the printer, then contact the next level of support.
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Restoring solutions, licenses, and configuration settings
To load the zip files that are extracted from the Service Restore Tool, do the following:
1 Open a Web browser, and then type the printer IP address.
2 Navigate to Settings > Configuration Files.
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3 From the Configuration File History tab, navigate to Import > Choose File.
4 Select the zip file from the expanded Service Restore Tool package.
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5 Click Import.
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6 Repeat steps 3 to 5 for the other zip files that are included in the expanded zip file.
Updating the printer firmware
Warning—Potential Damage: Before updating the printer firmware, ask the next level of support for the correct
code. Using an incorrect code level may damage the printer.
The printer must be in ready state in order to update the firmware.
Using a flash drive
This option is available only in printer models with front USB port.
Make sure to enable the Enable Drive and Update Code settings. You can find the settings in the Flash drive menu under
the Settings menu.
1 Insert the flash drive into the USB port.
2 From the home screen, navigate to USB Menu: Print from USB > Accept or OK.
3 Select the file that you need to flash.
Note: Do not turn off the printer while the update is going on.
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Using a network computer
Using the File Transfer Protocol (FTP)
Make sure that the printer is in ready state before flashing the printer.
1 Turn on the printer.
2 Obtain the IP address:
• From the home screen
• From the TCP/IP section of the Network/Ports menu
3 From the command prompt of a network computer, open an FTP session to the printer IP address.
4 Use a PUT command to place the firmware file on the printer.
The printer performs a POR sequence and terminates the FTP session.
5 Repeat steps 2 through 4 for the other files.
Using the Embedded Web Server
Make sure that the printer is in ready state before flashing the printer.
1 Open a Web browser, and then type the printer IP address.
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2 From the home page, navigate to Configuration > Update Firmware.
3 Select the file to use.
The printer performs a POR sequence and terminates the FTP session.
4 Repeat steps 2 through 4 for the other files.
Backing up eSF solutions and settings
Note: Export the eSF solutions and settings from the printer before replacing the controller board.
Exporting eSF solutions and settings file
POR the printer into Invalid engine mode. See “Entering invalid engine mode” on page 369.
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2 Open a Web browser, and then type the printer IP address.
Note: If the Web page cannot be accessed or an error occurs when starting the printer into Invalid engine mode,
then data backup is not an option. Inform the customer that the data cannot be saved.
3 Navigate to Settings > Solutions > Embedded Solutions.
4 From the Embedded Solutions page, select the applications that you want to export.
5 Click Export.
Note: There is a size limit of 128 KB on the export file.
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Importing eSF solutions and settings file
After replacing the controller board, import back to the printer the eSF solutions and settings that were exported.
1 POR the printer into Invalid engine mode. See “Entering invalid engine mode” on page 369.
2 Open a Web browser, and then type the printer IP address.
Note: If the Web page cannot be accessed or an error occurs when starting the printer into Invalid engine mode,
then data backup is not an option. Inform the customer that the data cannot be saved.
3 Navigate to Settings > Solutions > Embedded Solutions.
4 From the Embedded Solutions page, select the applications that you want to import.
5 Click Import.
Ribbon cable connectors
Zero Insertion Force (ZIF) connectors
Zero Insertion Force (ZIF) connectors are used on the boards and cards used in this printer. Before inserting or removing
a cable from these connectors, read this entire section. Great care must be taken to avoid damaging the connector or
cable when inserting or removing the cable.
Warning—Potential Damage: Do not insert the cable so that the contacts are facing the locking actuator. The
contacts always face away from the actuator.
Warning—Potential Damage: Do not insert the cable diagonally into the ZIF socket. This can cause damage to the
contacts on the cable.
Warning—Potential Damage: Avoid using a fingernail, or sharp object to open the locking mechanism. This could
damage the cable.
Warning—Potential Damage: Avoid pressing against the cable when opening the locking mechanism. This can also
damage the cable.
These are the types of ZIF connectors used in this printer:
• Horizontal top contact connector
• Horizontal bottom contact connector
• Vertical mount contact connector
• Horizontal sliding connector
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Horizontal top contact connector
This FRU contains a horizontal top contact cable connector. Read the instructions before proceeding.
The horizontal top contact connector uses a back flip locking actuator to lock the ribbon cable into the Zero Insertion
Force (ZIF) connector. The cable is inserted horizontally into the connector.
Warning—Potential Damage: When opening or closing this type of actuator, gently lift or close the two tabs located
on each end of the actuator. The two tabs should be moved simultaneously. Do not close the actuator from the
center of the actuator.
Removing a cable from the horizontal top contact connector
1 Place a finger at each end of the locking actuator, and then gently lift the actuator to the unlocked position.
2 Slide the cable out of the connector.
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Inserting a cable into the horizontal top contact connector
1 When installing the cable, check the locking actuator to ensure it is in the unlocked position. The tabs on the ends
of the actuator are vertical when the actuator is unlocked.
2 Insert the cable with the contacts on the cable facing up. Insert the cable on top of the actuator.
Note: Verify that the cable is installed squarely into the connector. If the cable is not squarely installed, then
intermittent failures could occur.
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3 Rotate the locking actuator to the locked position. The cable should not move while this step is performed. If the
cable moves, open the actuator, reposition the cable, and then close the actuator to the down position.
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Horizontal bottom contact connector
This FRU contains a horizontal bottom contact cable connector. Read the instructions before proceeding.
The horizontal bottom contact connector uses a flip locking actuator to lock the ribbon cable into the Zero Insertion
Force (ZIF) connector. The cable is inserted horizontally into the connector.
Warning—Potential Damage: When opening or closing this type of actuator, gently lift the center of the actuator
using your finger. Do not use a fingernail or screwdriver to open the actuator. This could damage the ribbon cable.
Do not close the actuator from the ends of the actuator.
Removing a cable from the horizontal bottom contact connector
1 Place two fingers towards each end of the locking actuator, and then gently lift the actuator to the unlocked position.
2 Slide the cable out of the connector.
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Inserting a cable into the horizontal bottom contact connector
1 Check the actuator to verify it is in the open position.
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2 Insert the cable into the ZIF connector with the contacts facing downward and away from the locking actuator. The
cable needs to be inserted below the actuator.
Note: Verify that the cable is installed squarely into the connector. If the cable is not squarely installed, then
intermittent failures could occur.
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3 Place your finger in the middle of the actuator, and then rotate the locking actuator to the locked position.
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Vertical mount contact connector
This FRU contains a vertical mount contact connector. Read the instructions before proceeding.
The vertical mount contact connector uses a back flip locking actuator to lock the ribbon cable into the Zero Insertion
Force (ZIF) connector. The cable is inserted vertically into the connector.
Warning—Potential Damage: When opening or closing this type of actuator, gently lift the center of the actuator
using your finger. Do not use a fingernail or screwdriver to open the actuator. This could damage the ribbon cable.
Do not close the actuator from the ends of the actuator.
Removing a cable from the vertical mount contact connector
1 Gently rotate the locking actuator from the center of the actuator to the unlocked position.
2 Slide the cable out of the connector.
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Inserting a cable into the vertical mount contact connector
1 When installing the cable, check the locking actuator to verify it is in the open position.
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2 Insert the cable with the contacts on the cable away from the locking actuator. Insert the cable on top of the actuator.
Note: Verify that the cable is installed squarely into the connector. If the cable is not squarely installed, then
intermittent failures could occur.
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3 Rotate the locking actuator to the locked position by pressing down on both ends of the actuator. The cable should
not move when this step is performed. If the cable moves, open the actuator, reposition the cable, and then close
the actuator to the down position.
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Horizontal sliding contact connector
This FRU contains a horizontal sliding contact connector. Read the instructions before proceeding.
The horizontal sliding contact connector uses a slide locking actuator to lock the ribbon cable into the Zero Insertion
Force (ZIF) connector. The cable is inserted horizontally into the connector.
Warning—Potential Damage: When opening or closing this type of actuator, gently push or pull the two tabs
located on each end of the actuator. Do not close the actuator from the center of the actuator. Do not use a
screwdriver to open or close the actuator. Damage to the cable or connector could occur.
Removing a cable from the horizontal sliding contact connector
1 Simultaneously slide the two tabs located on the ends of the locking actuator away from the connector.
2 Slide the cable out of the connector.
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Inserting a cable into the horizontal sliding contact connector
1 When installing the cable, check the locking actuator to verify it is in the open position. If you are opening the
connector, pull back on both end tabs using equal force to avoid breaking the connector.
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2 Insert the cable with the contacts on the cable facing away from the locking actuator. Insert the cable on top of the
actuator.
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3 Slide the locking actuator towards the connector, locking the cable into place. The cable should not move when
this step is performed. If the cable moves, open the actuator, reposition the cable, and then close the actuator to
the down position.
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Low Insertion Force (LIF) connector
This FRU contains a Low Insertion Force (LIF) connector. Read the instructions before proceeding.
Warning—Potential Damage: When installing a cable into an LIF connector, care must be taken to avoid bending the
edges of the cables and damaging the contacts on the cables.
Inserting a cable into the LIF connector
1 Looking at the connector, take note on which side the contacts are located. Many boards will have the word
“contacts” stamped on them to indicate which side of the LIF has the contacts. When looking at the board, take
note that the contacts from the board to the connector are located on the side of the connector with the contacts.
2 Insert the cable squarely into the connector.
Note: Verify that the cable is installed straight into the connector. If the cable is not installed properly, then
intermittent failures could occur.
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Adjustments
Media aligner roller adjustment
Complete the media aligner roller adjustment procedure when you replace the media aligner roller. Always print a copy
of the Quick Test Page before making any adjustments to the media aligner roller reference adjustment screw.
Note: When replacing the media aligner roller, back the reference adjustment screw out far enough to remove the
old media aligner roller and install the new one. It is not necessary to remove the screw.
• If you have just replaced the media aligner roller, go to “Step A” on page 393.
• If you are only correcting the top margin skew, go to “Step B” on page 393.
• If you are correcting the bottom margin skew or both top and bottom margin skew, go to “Step C” on page 394.
Step A
Set the initial position of the media aligner roller plate using a 3mm hex wrench at the access hole indicated in the
following image (left), to give a position roughly 20.5mm as shown in the image below (right). This is the nominal point
and should minimize the amount of adjustment needed.
Continue to “Step B” on page 393.
Step B
Print a copy of the Quick Test Page, and check the top alignment indicators printed on the test page. The difference in
the print location to the top edge of the paper between the left and right alignment indicators should be 0.5mm (one
dot) or less. Depending on the skew, turn the screw either clockwise or counterclockwise using a 3mm hex wrench,
and print a copy of the Quick Test Page to check the diamonds on the top and bottom margin. Continue adjusting the
screw as you check the results of each adjustment on a new test page until the top image skew is below 0.5mm. One
full 360-degree turn of the aligner screw will change the top edge skew by roughly 1mm (2 alignment indicator dots).
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Adjustment is typically 0-2 rotations. More than 3-4 turns, in either direction from the 20.5mm nominal spot, should
not be necessary and may indicate other issues with the tray (such as problems with the back and side restraints), pick
tires, or transfer roll mounting. If the top and bottom skew are below 0.5mm, the alignment process is complete.
Step C
Print a copy of the Quick Test Page, and check the top and bottom alignment indicators printed on the test page. The
goal is to make the skew at the top and bottom of the page parallel. Depending on the skew, turn the screw either
clockwise or counterclockwise using a 3mm hex wrench, and print a copy of the Quick Test Page to check the diamonds
on the top and bottom margin. Continue adjusting the screw as you check the results of each adjustment on a new test
page until you obtain the results you want. One full 360-degree turn of the aligner screw will change the leading edge
skew by roughly 1mm (2 alignment indicator dots).
Go to the polygon printhead mechanical registration adjustment procedure when this step is complete. See “Polygon
printhead mechanical registration adjustment” on page 394.
Polygon printhead mechanical registration adjustment
Complete the printhead mechanical registration adjustment procedure when you remove or replace the printhead, or
loosen the mounting screws.
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Install the new printhead with the mounting screws lightly tightened before printing the registration Quick Test Page
to see if adjustment is needed. Before adjustment of the printhead, loosen each of the three mounting screws by a half
turn. This will leave the screws loose enough to allow the printhead to move within its slots as the adjustment screw
is rotated. If the adjustment plate was left alone during the laser printhead replacement, it will retain its position and
should minimize the amount of printhead mechanical registration adjustment needed. When the registration is set,
the three mounting screws should be tightened.
To perform the printhead mechanical registration adjustment:
1 Print a Quick Test Page. From the Diagnostics menu, navigate to :
REGISTRATION > Quick Test
If the skew between the bottom left and bottom right alignment indicators is greater than 0.5mm (1 dot), then
proceed with adjustment. Otherwise, no polygon printhead adjustment is needed.
2 Raise the paper support located in the top of the standard bin to its upright position to locate the three access holes
as shown in the illustration below.
3 Loosen, by a half turn, each of the three printhead mounting screws securing the printhead to the printer frame.
This will require a 5.5mm hex-socket screwdriver.
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4 Locate the printhead adjustment screw access hole in the front of the printhead access cover. This will require a
3mm hex wrench to adjust. A ballhead hex wrench is suggested to make it easier to find the screw head.
5 Check the Quick Test Page for any sign of misalignment by checking the diamonds at the bottom left and bottom
right of the test page for equal distance from the bottom of the page. If necessary, rotate the printhead adjusting
screw with a 3mm hex wrench either clockwise (to rotate the image clockwise) or counterclockwise (to rotate the
image counterclockwise), and run another Quick Test Page. One full 360-degree turn of the printhead screw will
change the skew on both edges by roughly 0.5mm (1 alignment indicator dot). You may need to repeat this step
two or three times before you get satisfactory bottom skew results.
1 To correct, turn the printhead screw clockwise to rotate both edges clockwise.
2 To correct, turn the printhead screw counterclockwise to rotate both edges
counterclockwise.
Note: One full 360‑degree turn of the printhead screw will change the skew on both edges by roughly 0.5 mm (one
alignment indicator dot).
Warning—Potential Damage: Caution should be taken to not turn the printhead adjustment mechanism more
than a few turns counterclockwise, for the screw will fully back out and will become disassembled. Stop turning
the screw when you stop feeling resistance, you may need to turn it clockwise to reengage the screw into the
adjustment plate. Turning more than a few turns clockwise will bottom out the screw. If the adjustment screw is
difficult to turn, make sure that the printhead mounting screws are loose.
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Warning—Potential Damage: In some cases the adjustment process may take several tightening and loosening
cycles of the printhead mounting screws. Care should be taken to avoid stripping the mounting screw bosses.
Use only a manual hex head screwdriver, for this reason.
6 When you have the correct adjustment, ensure that the printhead mounting screws are properly tightened, and
print a final Quick Test Page for verification.
7 Check the top edge skew and perform the media aligner roller adjustment, if required. See “Media aligner roller
adjustment” on page 393.
ADF skew adjustments
Note: Before you start any of the ADF skew adjustment procedures, make sure the “Media aligner roller
adjustment” on page 393 has been properly performed.
ADF front side skew adjustment (First step)
1 Determine which correction to apply.
1 To correct, rotate the deskew idle roll bracket counterclockwise.
2 To correct, rotate the deskew idle roll bracket clockwise.
Note: One mark of adjustment equals approximately 0.4 mm of skew correction.
2 Remove the ADF front cover. See “ADF front cover removal” on page 587.
3 Loosen the two screws (A) securing the deskew idle roll bracket to the ADF frame.
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4 Rotate the deskew idle roll bracket (B) to correct the skew.
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5 After the skew has been corrected, tighten the two screws, and reinstall the ADF front cover.
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ADF front side skew adjustment (Second step)
1 Determine which correction to apply.
1 To correct, rotate the ADF adjustment screw clockwise.
2 To correct, rotate the ADF adjustment screw counterclockwise.
Note: One 360‑degree turn of the ADF adjustment screw equals approximately 0.4 mm of skew correction.
2 Remove the ADF rear cover. See “ADF rear cover removal” on page 598.
3 Remove the flatbed glass cushion. See “Flatbed glass cushion removal” on page 632.
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4 Loosen the three nuts and four screws (A) securing the adjusting bracket to the ADF frame, as shown.
5 Rotate the ADF adjustment screw (B) to correct the skew.
6 After the skew has been corrected, tighten the three nuts and the four screws, and reinstall the ADF rear cover.
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ADF back side skew adjustment
1 Determine which correction to apply.
1 To correct, rotate the CCDM adjustment screw counterclockwise.
2 To correct, rotate the CCDM adjustment screw clockwise.
Note: One 360‑degree turn of the CCDM adjustment screw equals approximately 0.8 mm of skew correction.
2 Remove the ADF front cover. See “ADF front cover removal” on page 587.
3 Loosen the two screws (A) securing the adjusting bracket to the ADF frame.
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4 Turn the CCDM adjustment screw (B) to correct the skew.
5 After the skew has been corrected, reinstall the front cover.
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Media squareness check
This test is critical when cut paper is being used to align the ADF skew during reworks. Pallets of quality paper may be
found with more than 2 mm of skew.
1 Remove two consecutive pieces of paper from the ream.
2 Flip one of the pages over, as shown in the following image.
The following image shows the final position of the two pages.
3 Tap the two pages on a flat surface until the bottom edges are aligned.
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4 Look closely at the top edges of the media to see if the sheets are aligned.
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Print skew correction
This test is critical when cut paper is being used to align the ADF skew during reworks. Pallets of quality paper may be
found with more than 2 mm of skew.
1 Check the media squareness. See “Media squareness check” on page 401.
2 Make sure the guides in the paper tray are properly aligned.
3 Check the base printer skew and registration.
4 Plug the printer into the power source and power the printer on in Diagnostics mode. See “Entering the Diagnostics
menu” on page 336.
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5 Measure L1, L2, T1, T2, R1, R2, B1, and B2 data points as shown in the following image.
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6 Determine the following calculations:
• L2-L1 = ___
• R2-R1 = ___
• T2-T1 = ___
• B2-B1 = ___
7 Determine whether the printer passes or fails the skew specifications based on the values listed in the following
table:
# (L2-L1) (R2-R1) (T2-T1) (B2-B1)
Letter Less than or equal to 1.4mmLess than or equal to 1.4mmLess than or equal to 1 mm Less than or equal to 1 mm
A4 Less than or equal to 1.5mmLess than or equal to 1.5
mm
Legal Less than or equal to 1.8mmLess than or equal to 1.8
mm
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8 If the printer does not meet the skew specifications, adjust the reference edge as specified in “Media aligner roller
adjustment” on page 393 or adjust the printhead as specified in “Polygon printhead mechanical registration
adjustment” on page 394 as needed.
9 Check the registration by looking at the dots at the edges of the page. Adjust as needed.
Copy skew correction
This test is critical when cut paper is being used to align the ADF skew during reworks. Pallets of quality paper may be
found with more than 2 mm of skew.
1 Check the media squareness. See “Media squareness check” on page 401.
2 Make sure the guides in the paper tray are properly aligned.
3 Check the base printer skew and registration.
4 Plug the printer into the power source and power the printer on in normal printing mode.
5 Measure CopyL1, CopyL2, CopyT1, CopyT2, CopyR1, CopyR2, CopyB1, and CopyB2 data points as shown in the
following image.
6 Determine the following calculations:
• CopyL2-CopyL1 = ___
• CopyR2-CopyR1 = ___
• CopyT2-CopyT1 = ___
• CopyB2-CopyB1 = ___
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7 Determine whether the printer passes or fails the skew specifications based on the values listed in the following
table:
Measurement Specification Description
(CopyL2‑CopyL1) Less than or equal to 2.0 mm Left skew
(Copy R2‑CopyR1) Less than or equal to 2.0 mm Right skew
(CopyT2‑CopyT1) Less than or equal to 1.5 mm Top skew
(CopyB2‑CopyB1) Less than or equal to 1.5 mm Bottom skew
Measurement Specification Description
(CopyL2‑CopyL1) Less than or equal to 1.5 mm Vertical registration
(CopyB2‑CopyB1) Less than or equal to 1.5 mm Horizontal registration
8 If the printer does not meet the skew specifications, adjust the reference edge as specified in “Media aligner roller
adjustment” on page 393.
9 Adjust the scanner registration manually as needed in the Configuration menu. See “Entering the Configuration
menu” on page 356.
Scanner calibration
Regenerating high frequency defect data
1 Perform a scanner calibration reset.
Navigate to Diagnostic mode > Scanner Tests > Scanner Calibration Reset.
2 The following message prompt displays:
Note: Before selecting Continue, make sure to clean the mylar strip (A) and CCD glass (B) with isopropyl alcohol
and a lint free towel or cloth.
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3 Once the cleaning process is done, select Continue.
4 When the Scanner Calibration Reset Action has Passed message displays, press the cancel button
on the keypad to exit.
5 Power off the unit.
Registering the front ADF and back ADF
1 Perform a print quick test.
Navigate to Configuration mode > Scanner Manual Registration > Print Quick Test.
2 The following Quick Test target page is printed:
Note: Make sure the margin spacing on the target page is uniform all the way around the target. If it is not, the
printer margins may need to be reset.
Note: 110V units print letter size while 220V units print A4 size.
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3 Register the front ADF:
a Set the printed target page into the paper tray facing up, and then navigate to Configuration mode > Scanner
Manual Registration > Print Quick Test.
b Remove the copy of the target page from the printer. If the copy is spaced evenly on the top margin and both
sides of the page, then the front side registration is complete.
If the copy is not spaced properly on the top and both sides, you will need to make an adjustment.
c Select ADF Front to make the front adjustments.
d Make adjustments as needed, and then select Submit.
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e Load the target page in the ADF tray facing up, and then select Copy Quick Test to check the results.
f Repeat steps a through e until the copy is evenly spaced on the top and both sides.
Note: Once a test page with evenly spaced margins is generated, keep the copy as an aid in setting the ADF
magnification
4 Register the back ADF:
a Set the printed target page into the paper tray facing down, and then navigate to Configuration mode > Scanner
Manual Registration > Print Quick Test
b Remove the copy of the target page from the printer. If the copy is evenly spaced on the top and both sides
then the back side registration is complete.
If the copy is not spaced properly, you will need to make an adjustment.
c Select ADF Back to make the back side adjustments.
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d Make adjustments as needed, and then select Submit.
e Load the test target page facing down in the ADF tray, and then select Copy Quick Test to check the results.
f Repeat steps a through e until the copy is evenly spaced on the top and both sides.
Note: Once a test page with evenly spaced margins is generated, keep the copy as an aid in setting the ADF
magnification.
5 When both the front and back side ADF has been registered, power the unit off, and then retune the ADF
Magnification. See
“Retuning the ADF magnification” on page 412.
Registering the flatbed and front ADF
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1 Perform a print quick test.
Navigate to Configuration mode > Scanner Manual Registration > Print Quick Test.
2 The following Quick Test target page is printed:
Note: Make sure the margin spacing on the target page is uniform all the way around the target. If it is not, the
printer margins may need to be reset.
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Note: 110V units print letter size while 220V units print A4 size.
3 Register the flatbed:
a Open the ADF, and then remove the flatbed glass cushion (A).
b Place the glass cushion on the flatbed scanner glass with its Velcro pads facing up, and aligning it squarely in
the corner where the green arrow is located.
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c Lower the ADF down onto the scanner glass, and then raise the ADF up again to pick up the glass cushion.
d Run your hand across the glass cushion to make sure it is attached.
4 Place the target page face down on the scanner glass.
Note: Make sure the paper is properly aligned on the scanner glass. The back left corner of the paper should
align squarely with the green arrow on the scanner glass.
5 Lower the ADF down and then select Quick Copy Test.
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6 Remove the copy of the target page from the printer. If the copy is spaced evenly on the top and both sides, then
the flatbed registration is complete.
If the copy is not centered, then you will need to make an adjustment.
7 Select Flatbed to make the flatbed adjustments.
8 Make adjustments as needed, and then select Submit.
9 Select Copy Quick Test and check the results.
10 Repeat steps 5 through 9 until the copy is evenly spaced on the top and both sides.
Note: Once a test page with evenly spaced margins is generated, keep the copy as an aid in setting the flatbed
magnification.
11 Register the front ADF:
a Set the printed target page into the paper tray facing up, and then navigate to Configuration mode > Scanner
Manual Registration > Print Quick Test.
b Remove the copy of the target page from the printer. If the copy is spaced evenly on the top margin and both
sides of the page, then the front side registration is complete.
If the copy is not spaced properly on the top and both sides, you will need to make an adjustment.
c Select ADF Front to make the front adjustments.
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d Make adjustments as needed, and then select Submit.
e Load the target page in the ADF tray facing up, and then select Copy Quick Test to check the results.
f Repeat steps a through e until the copy is evenly spaced on the top and both sides.
Note: Once a test page with evenly spaced margins is generated, keep the copy as an aid in setting the ADF
magnification.
12 When both the front and backside ADF has been registered, power the unit off, and then retune the flatbed
magnification. See
“Retuning the flatbed magnification (code P132 or greater)” on page 413.
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Retuning the ADF magnification
Note: If the bottom arrows are touching the edge of the paper on both the front and the back side, the ADF scan
magnification is good and you can skip this section.
1 Power on the unit and perform an ADF Magnification test.
Navigate to Diagnostic mode > Scanner Tests > ADF Magnification.
2 Review both of the saved ADF copies and see where the target arrows fall on the bottom of the page.
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If you cannot see them you will need to decrease ADF Magnification until the arrows are touching the bottom of
the page. If you can see the arrows but they are not touching the bottom of the page, you will need to increase
ADF magnification.
The range of adjustment is from 1.020 to 0.980 in increments of 0.005.
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3 Make the needed adjustment and then select Submit to save the settings.
4 Select Back, and then select Scanner Calibration > Copy Quick Test to check the adjustments.
5 Put the test target page in the ADF tray face up, and then select Copy Quick Test to check the Front ADF scan
magnification.
6 Put the test target page in the ADF tray face down and then select Copy Quick Test to check the Back ADF scan
magnification.
7 Check both scans. If they need further adjustment on the ADF magnification, then go back and repeat the adjustment
process until the correct magnification value is chosen.
8 When done, select Back, and then select Exit Diags to reboot the printer.
Retuning the flatbed magnification (code P132 or greater)
1 Power on the unit and perform an FB Magnification test.
Navigate to Diagnostic mode > Scanner Tests > FB Magnification.
2 Review both of the saved ADF copies and see where the target arrows fall on the bottom of the page.
If you cannot see them you will need to decrease FB Magnification until the arrows are touching the bottom of the
page. If you can see the arrows but they are not touching the bottom of the page, you will need to increase FB
magnification.
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The range of adjustment is from 1.020 to 0.980 in increments of 0.005.
3 Make the needed adjustment and then select Submit to save the settings.
4 Select Back, and then select Scanner Calibration > Copy Quick Test to check the adjustments.
5 Put the test target page in the ADF tray face up, and then select Copy Quick Test to check the flatbed scan
magnification.
6 Check the scan results and see if further adjustment is needed. If they need further adjustment, then go back and
repeat the adjustment process until the correct magnification value is chosen.
7 When done, select Back, and then select Exit Diags to reboot the printer.
Removal procedures
Keep the following tips in mind as you replace parts:
• Some removal procedures require removing cable ties. You must replace cable ties during reassembly to avoid
pinching wires, obstructing the paper path, or restricting mechanical movement.
• Remove the toner cartridges, imaging unit, and media tray before removing other printer parts. The imaging unit
should be carefully set on a clean, smooth, and flat surface. It should also be protected from light while out of the
device.
• Disconnect all external cables from the printer to prevent possible damage during service.
• Unless otherwise stated, reinstall the parts in reverse order of removal.
• When reinstalling a part held with several screws, start all screws before the final tightening.
Left side removals
Column left front cover removal (MX81x)
1 Remove the controller board access cover. See “Controller board access cover removal” on page 423.
2 Remove the rear door. See “Rear door removal” on page 549.
3 Remove the left cover. See “Left cover removal (MX81x)” on page 418.
4 Open the front door.
5 Open the cartridge door.
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6 Remove the screw (A) securing the column left front cover to the machine.
7 Pull the column left front cover away from the machine, as showing in the following image, and remove it.
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Column left outer cover removal (MX81x)
1 Remove the controller board access cover. See “Controller board access cover removal” on page 423.
2 Remove the rear door. See “Rear door removal” on page 549.
3 Remove the left cover. See “Left cover removal (MX81x)” on page 418.
4 Remove the column left front cover. See “Column left front cover removal (MX81x)” on page 414.
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5 Remove the two screws (A) securing the column left outer cover to the machine.
6 Remove the column left outer cover.
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Left cover removal (MX71x)
1 Open the front door.
2 Pull the media tray from the machine.
3 Raise the control panel to its uppermost position.
4 Open the rear door.
5 Detach the controller board access cover.
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6 Remove the eight screws (A) securing the left cover to the machine.
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7 Remove the left cover.
Note: When removing the left cover, the charcoal filter might become detached.
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Installation note: When replacing the left cover, ensure that the charcoal filter is properly installed.
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Left cover removal (MX81x)
1 Remove the controller board access cover. See “Controller board access cover removal” on page 423.
2 Remove the rear door. See “Rear door removal” on page 549.
3 Open the front door.
4 Pull the media tray from the machine.
5 Remove the four screws (A) securing the left cover to the machine.
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6 Remove the left cover.
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Note: When removing the left cover, the charcoal filter might become detached.
Installation note: When replacing the left cover, ensure that the charcoal filter is properly installed.
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Left inner cover removal
1 Open the front door.
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2 Pull the media tray from the machine.
3 Raise the control panel to its uppermost position.
4 Remove the rear door. See “Rear door removal” on page 549.
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5 Detach the controller board access cover.
6 Remove the rear lower cover. See “Rear lower cover removal” on page 551.
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7 Remove the top cover. See “Top cover removal” on page 561.
8 Remove the three screws (A) securing the left inner cover to the machine.
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9 Remove the left inner cover.
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Controller board removal
Notes:
• Back up the eSF solutions and settings before replacing the controller board. For more information, see
“Backing up eSF solutions and settings” on page 378
• If you are replacing the controller board, retain the flash card from the original controller board so that you can
use it with the replacement controller board.
Warning—Potential Damage: When replacing the control panel, control panel board, or controller board, replace
only one component at a time. Replace the required component and perform a POR before replacing a second
component. If this procedure is not followed, the printer will be rendered inoperable. Never replace both the control
panel and the controller board without a POR after installing each one or the printer will be rendered inoperable.
Never install or remove these components as a method of troubleshooting while operating in normal user mode.
“Controller board/control panel replacement” on page 372.
See
Warning—Potential Damage: When a component has been installed in a machine and has been powered up in
normal user mode, it cannot be used in another machine; it must be returned to the manufacturer. The machine
must be powered up in Diagnostic mode or the controller board, control panel boards, or control panel will become
locked.
CAUTION—POTENTIAL INJURY: This product contains a lithium battery. There is a risk of explosion if the battery
is replaced with an incorrect type. Discard used batteries according to the battery manufacturer’s instructions
and local regulations.
1 Remove the right cover. See “Right cover removal (MX71x)” on page 438.
2 Remove the rear lower cover. See “Rear lower cover removal” on page 551.
3 Remove the LVPS. See “LVPS removal” on page 445.
4 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
5 Remove the controller board access shield. See “Controller board access shield removal” on page 424.
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6 Remove the controller board cooling fan. See “Controller board cooling fan removal” on page 424.
7 Disconnect all cables from the controller board.
8 Remove the seven screws (A) securing the controller board to the machine.
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9 Remove the controller board.
Installation note: Make sure you retain the flash card from the original controller board so that you can use it with
the replacement controller board.
Installation note: Make sure to regenerate high frequency defect data after replacing the controller board. See
“Regenerating high frequency defect data” on page 405.
Installation note: After the new controller board is installed, perform printer configuration restoration. See
“Restoring the printer configuration after replacing the controller board” on page 373.
Controller board access cover removal
Detach the controller board access cover from the machine.
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Controller board access shield removal
1 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
2 Loosen the eight screws (A) securing the controller board access shield to the machine.
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3 Move the controller board access shield toward the front of the machine to remove it.
Controller board cooling fan removal
1 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
2 Remove the controller board access shield. See “Controller board access shield removal” on page 424.
3 Disconnect the cable (A).
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4 Remove the two screws (B), and then remove the fan.
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Fuser drive motor removal
1 Remove the rear door. See “Rear door removal” on page 549.
2 Remove the fuser. See “Fuser removal” on page 556.
3 Remove the imaging unit from the machine.
4 Remove the LVPS. See “LVPS removal” on page 445.
5 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
6 Remove the board housing. See “Board housing removal” on page 431.
7 Remove the main drive motor. See “Main drive motor removal” on page 428.
8 Remove the harnesses from the clamp (A).
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9 Remove the three screws (B) securing the fuser drive motor to the machine.
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Note: When removing the lowermost screw, the grounding plate will become detached.
10 Disconnect the cable (C) from the fuser drive motor.
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11 Remove the fuser drive motor.
Installation notes:
• When replacing the fuser drive motor, ensure that the grounding plate is properly reattached.
• When replacing the fuser drive motor, ensure that the cable is properly reconnected.
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Main cooling fan removal
1 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
2 Remove the controller board access shield. See “Controller board access shield removal” on page 424.
3 Remove the three screws (B) securing the main cooling fan to the machine.
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4 Disconnect the cable (C) from the controller board, and remove the main cooling fan.
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Main drive motor removal
Installation warning: When replacing the main drive motor, make sure that the control panel door is in the closed
position or the main drive motor will not align properly, and damage will occur.
1 Remove the imaging unit from the machine.
2 Remove the right cover. See “Right cover removal (MX71x)” on page 438.
3 Remove the rear lower cover. See “Rear lower cover removal” on page 551.
4 Remove the LVPS. See “LVPS removal” on page 445.
5 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
6 Remove the board housing. See “Board housing removal” on page 431.
7 Remove the harnesses from the clamp (A).
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8 Remove the four screws (B) securing the main drive motor to the machine.
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9 Remove the main drive motor from the machine.
10 Disconnect the cable from the main drive motor.
Installation warning: When replacing the main drive motor, make sure that all gears and drive shafts are properly
aligned, or damage will occur.
Media feeder removal
1 Remove the right cover. See “Right cover removal (MX71x)” on page 438.
2 Remove the rear lower cover. See “Rear lower cover removal” on page 551.
3 Remove the LVPS. See “LVPS removal” on page 445.
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4 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
5 Remove the board housing. See “Board housing removal” on page 431.
6 Remove the pick roller assembly. See “Pick roller assembly removal” on page 541.
7 Remove the three screws (A) securing the media feeder to the machine.
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Note: Use care when removing the media feeder to avoid damage.
8 Remove the media feeder.
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Board housing removal
Note: When removing the board housing, the controller board will remain attached to the board housing.
1 Remove the right cover. See “Right cover removal (MX71x)” on page 438.
2 Remove the rear lower cover. See “Rear lower cover removal” on page 551.
3 Remove the LVPS. See “LVPS removal” on page 445.
4 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
5 Disconnect all of the cables from the controller board.
6 Remove the five screws (A).
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7 Remove the board housing.
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Sensor (control panel interlock) removal
1 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
2 Remove the screw (A) securing the bracket to the machine.
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3 Remove the bracket from the machine.
4 Disconnect the cable (B) from the sensor (control panel interlock), and remove it.
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Sensor (pick roller position) removal
1 Remove the right cover. See “Right cover removal (MX71x)” on page 438.
2 Remove the rear lower cover. See “Rear lower cover removal” on page 551.
3 Remove the LVPS. See “LVPS removal” on page 445.
4 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
5 Remove the board housing. See “Board housing removal” on page 431.
6 Remove the pick roller assembly. See “Pick roller assembly removal” on page 541.
7 Remove the media feeder. See “Media feeder removal” on page 429.
8 Release the hooks (A) securing the sensor (pick roller position) to the assembly.
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9 Remove the sensor (pick roller position).
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10 Disconnect the cable.
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Toner add motor removal
1 Remove the right cover. See “Right cover removal (MX71x)” on page 438.
2 Remove the rear lower cover. See “Rear lower cover removal” on page 551.
3 Remove the LVPS. See “LVPS removal” on page 445.
4 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
5 Remove the board housing. See “Board housing removal” on page 431.
6 Remove the three screws (A) securing the toner add motor to the machine.
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7 Remove the toner add motor.
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Right side removals
Column right inner cover removal
1 Remove the right cover. See “Right cover removal (MX71x)” on page 438.
2 Remove the two screws (A) securing the column right rear cover to the machine.
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3 Remove the column right rear cover.
4 Remove the scanner rear lower cover.
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5 Remove the top cover. See “Top cover removal” on page 561.
6 Remove the four screws (B) securing the column right inner cover to the machine.
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7 Remove the column right inner cover.
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Column right outer cover removal
1 Remove the right cover. See “Right cover removal (MX71x)” on page 438.
2 Remove the right inner cover. See “Column right inner cover removal” on page 435.
3 Remove the four screws (A) securing the column right outer cover to the machine.
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4 Remove the column right outer cover.
5 Disconnect the cables.
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Right cover removal (MX71x)
1 Open the front door.
2 Raise the operator panel to its uppermost position.
3 Remove the rear door. See “Rear door removal” on page 549.
4 Remove the rear lower cover. See “Rear lower cover removal” on page 551.
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5 Remove the five screws (A) securing the right cover to the machine.
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6 Remove the right cover.
Right cover removal (MX81x)
1 Open the front door.
2 Remove the media tray.
3 Open the cartridge door.
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4 Remove the five screws (A) securing the right cover to the machine.
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5 Remove the right cover.
Right inner cover removal (MX71x)
1 Remove the right cover. See “Left inner cover removal” on page 420.
2 Remove the three screws (A) securing the right inner cover to the machine.
3 Remove the right inner cover.
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Control panel speaker and speaker bracket removal (MX71x)
1 Remove the right cover. See “Right cover removal (MX71x)” on page 438.
2 Disconnect the speaker cable (A).
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3 Press down on the latch, and then pull to remove the speaker with the speaker bracket.
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4 Remove the speaker (B) from the speaker bracket (C).
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Cartridge cooling fan removal
1 Remove the right cover. See “Right cover removal (MX71x)” on page 438.
2 Remove the screw (A) securing the cartridge cooling fan to the machine.
3 Remove the cartridge cooling fan.
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4 Disconnect the cable (B).
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Installation note: When replacing the cartridge cooling fan, ensure that it is installed as shown in the picture.
Duplex cooling fan removal
1 Remove the right cover. See “Right cover removal (MX71x)” on page 438.
2 Remove the screw (A) securing the duplex cooling fan from the machine.
3 Remove the duplex cooling fan.
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4 Disconnect the cable (B).
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Installation note: When replacing the duplex cooling fan, ensure that it is installed as shown in the picture.
HVPS removal
1 Remove the right cover. See “Right cover removal (MX71x)” on page 438.
2 Disconnect four cables (A) from the HVPS.
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3 Remove the four screws (B) securing the HVPS to the machine.
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4 Remove the HVPS.
Installation notes:
• When replacing the HVPS, make sure the plastic insulating shield is properly reattached.
• When replacing the HVPS, make sure the cables are properly reattached.
LVPS removal
1 Remove the right cover. See “Right cover removal (MX71x)” on page 438.
2 Remove the rear lower cover. See “Rear lower cover removal” on page 551.
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3 Disconnect the main power cable (A) from the LVPS.
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4 While holding down the duplex rear flap, remove the two screws (B) securing the LVPS to the machine.
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5 Gently but firmly pull the LVPS partially from the machine, as shown in the following image.
6 Disconnect the fuser power cable (C) from the LVPS.
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7 Remove the LVPS.
Installation warning: When replacing the LVPS, ensure that the LVPS is perfectly square to the printer, as
opposed to replacing it at an angle. If you try to replace the LVPS at an angle, damage will occur to the controller
board.
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Installation notes:
• When replacing the LVPS, ensure that all connections are replaced.
• When replacing the LVPS, ensure that the connector pins (D) properly engage the controller board.
Power switch removal
1 Remove the rear lower cover. See “Rear lower cover removal” on page 551.
2 Remove the right cover. See “Right cover removal (MX71x)” on page 438.
3 Remove the right frame extension. See “Right frame extension removal (MX81x)” on page 547.
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4 Disconnect the main power cable (A) from the LVPS.
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5 Remove the two screws (B) securing the power switch to the machine.
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6 Remove the screw (C) securing the grounding cable.
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7 Remove the screw (D) securing the bracket to the machine.
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8 Remove the power switch.
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Front side removals
Duplex exit diverter removal
1 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
2 Remove the controller board access shield. See “Controller board access shield removal” on page 424.
3 Remove the media tray. See “Media tray removal” on page 538.
4 Remove the MPF tray. See “MPF tray removal” on page 472.
5 Remove the front door. See “Front door removal” on page 453.
6 Remove the toner cartridge.
7 Remove the imaging unit.
8 Remove the MPF feeder lift plate. See “MPF feeder lift plate removal” on page 465.
9 Remove the media turn guide. See “Media turn guide removal” on page 462.
10 Remove the media vertical guide. See “Media vertical guide removal” on page 463.
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11 Remove the spring (A).
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12 Move the duplex exit diverter to the right, and detach the left hinge point.
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13 Lift the right hinge point, and remove the duplex exit diverter.
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Front door removal
1 Open the control panel.
2 Lower the front door.
3 Remove the MPF tray. See “MPF tray removal” on page 472.
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4 Gently flex the left bracket (A) and release the tab on the MPF support link.
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5 Gently flex the right bracket (B) and release the tab on the MPF support link.
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6 Slide the front door to the left, and detach it from the machine.
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Inner guide deflector removal
1 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
2 Remove the controller board access shield. See “Controller board access shield removal” on page 424.
3 Remove the media tray. See “Media tray removal” on page 538.
4 Remove the MPF tray. See “MPF tray removal” on page 472.
5 Remove the front door. See “Front door removal” on page 453.
6 Remove the toner cartridge.
7 Remove the imaging unit.
8 Remove the MPF feeder lift plate. See “MPF feeder lift plate removal” on page 465.
9 Remove the media turn guide. See “Media turn guide removal” on page 462.
10 Remove the media vertical guide. See “Media vertical guide removal” on page 463.
11 Remove the duplex exit diverter. See “Duplex exit diverter removal” on page 451.
12 Gently press the mounting loops inward to free them from the bosses on the frame.
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13 Release the upper hooks on the inner guide deflector.
14 Remove the inner guide deflector.
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Installation warning: Ensure that the four retention hooks (A) on the inner guide deflector are properly
reattached.
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Laser printhead removal
Installation note: When replacing the laser printhead, ensure that the proper adjustments are made. For more
information, go to
1 Open the control panel door.
2 Remove the toner cartridge.
3 Remove the two screws (A) securing the printhead access cover to the machine.
“Polygon printhead mechanical registration adjustment” on page 394.
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Warning—Potential Damage: When removing the printhead access cover, ensure that the cartridge cooling fan
cable does not become disconnected.
4 Remove the printhead access cover.
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5 Remove all of the harnesses from the back side of the printhead access cover.
6 Raise the paper support on top of the printer to provide access to the printhead mounting screws.
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7 Remove the three 5.5mm hex screws (B) securing the laser printhead to the machine.
Note: For MX71x, the printhead mounting screws are located under the paper support which is located under
the flatbed scanner.
Note: Ensure the screws do not fall inside the machine.
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Note: When removing the laser printhead, do not adjust the printhead adjuster screw until the new printhead
has been installed.
8 Gently lift and then remove the laser printhead from the machine.
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9 Disconnect the two cables from the laser printhead.
Installation note: When the new laser printhead has been installed, complete the polygon printhead mechanical
registration adjustment procedure, as needed. See
page 394.
“Polygon printhead mechanical registration adjustment” on
Media aligner roller removal
Installation warning: When you reinstall the media aligner roller, you will have to adjust the media alignment. See
“Media aligner roller adjustment” on page 393.
Warning—Potential Damage: When removing the media aligner, ensure that you retain the attached spring.
1 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
2 Remove the media tray. See “Media tray removal” on page 538.
3 Remove the MPF tray. See “MPF tray removal” on page 472.
4 Remove the front door. See “Front door removal” on page 453.
5 Remove the toner cartridge.
6 Remove the imaging unit.
7 Remove the media turn guide. See “Media turn guide removal” on page 462.
8 Remove the MPF pick roller. See “MPF pick roller removal” on page 468.
9 Remove the MPF feeder lift plate. See “MPF feeder lift plate removal” on page 465.
10 Remove the media vertical guide. See “Media vertical guide removal” on page 463.
11 Remove the duplex exit diverter. See “Duplex exit diverter removal” on page 451.
12 Remove the inner guide deflector. See “Inner guide deflector removal” on page 455.
13 Remove the three screws (A) securing the media aligner roller to the machine.
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14 Remove the screw (B) securing the grounding wire to the media aligner roller.
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15 Locate the adjuster screw access hole in the controller board shield.
Note: The adjuster screw is contained between the left frame and the drive plate; it will stay in place during
media aligner roller replacement. If the adjuster screw needs to be replaced, then the controller board and the
main drive motor will also have to be removed to access the adjuster screw.
16 Using a 3mm hex wrench, completely loosen the adjuster screw (C) counterclockwise, as shown in the following
image.
Installation warning: Make sure to reattach the grounding strap to the correct screw, and make sure the
grounding strap is out of the paper path.
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17 Gently detach the media aligner roller.
Warning—Potential Damage: When removing the media aligner, ensure that you retain the attached spring.
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Media turn guide removal
1 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
2 Remove the controller board access shield. See “Controller board access shield removal” on page 424.
3 Remove the media tray. See “Media tray removal” on page 538.
4 Open the control panel door.
5 Remove the toner cartridge.
6 Remove the imaging unit.
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7 Remove the MPF feeder lift plate. See “MPF feeder lift plate removal” on page 465.
8 Gently slide the media turn guide to the right to detach it from the machine.
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9 Remove the media turn guide.
Installation note: When replacing the media turn guide, ensure that the alignment pin properly engages the
media turn guide and that the alignment hooks properly engage the slots in the frame. If these parts are not
properly engaged, paper jams will occur.
Media vertical guide removal
1 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
2 Remove the controller board access shield. See “Controller board access shield removal” on page 424.
3 Remove the media tray. See “Media tray removal” on page 538.
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4 Open the control panel door.
5 Remove the toner cartridge.
6 Remove the imaging unit.
7 Remove the MPF feeder lift plate. See “MPF feeder lift plate removal” on page 465.
8 Remove the media turn guide. See “Media turn guide removal” on page 462.
9 Detach the right side of the media vertical guide.
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10 Remove the media vertical guide.
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MPF feeder lift plate removal
1 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
2 Remove the controller board access shield. See “Controller board access shield removal” on page 424.
3 Remove the media tray. See “Media tray removal” on page 538.
4 Open the control panel door.
5 Remove the toner cartridge.
6 Remove the imaging unit.
7 Remove the four screws (A) securing the MPF feeder lift plate to the machine.
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8 Press down the plate, as shown in the following image, and remove the MPF feeder lift plate.
Warning—Potential Damage: When you press down the plate, you are lowering the pick pad (B) away from the
MPF feed roller to prevent damage. If you do not do this, the pick pad will likely become damaged.
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Installation warning: When replacing the MPF feeder lift plate ensure that the pick pad (B) is placed properly
behind the MPF feed roller.
Installation warning: When replacing the MPF feeder lift plate ensure that the actuator flag (C) is placed in the
slot, as shown in the following image.
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9 Disconnect the MPF pick solenoid cable - J3 (D).
10 Disconnect the MPF feeder lift plate cable - J38 (E).
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11 Remove the MPF feeder lift plate.
Installation warning: When replacing the MPF feeder lift plate, ensure that the MPF feeder lift plate cable and
solenoid cable are properly rerouted and that all cables are properly reconnected. Make sure that these cables
are not pinched between the MPF feeder lift plate and the frame before replacing the screws.
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MPF pick roller removal
1 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
2 Remove the controller board access shield. See “Controller board access shield removal” on page 424.
3 Remove the media tray. See “Media tray removal” on page 538.
4 Open the control panel door.
5 Remove the toner cartridge.
6 Remove the imaging unit.
7 Remove the media turn guide. See “Media turn guide removal” on page 462.
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8 Remove the E-clip securing the MPF pick roller to the machine.
9 Remove the flange.
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10 Remove the MPF pick roller.
11 Remove the second flange.
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MPF solenoid removal
1 Remove the left cover. See “Left cover removal (MX71x)” on page 416.
2 Remove the controller board access shield. See “Controller board access shield removal” on page 424.
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