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Lexmark X748

Lexmark X748

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Black disappears from copy jobs

What you will see

No black output results when performing a copy job. This does not affect print jobs or printing from a computer or USB flash drive, or viewing a Scan-to-USB file. This copy issue has been seen on machines that have been in service for a long time.

Solution

Contact Lexmark Technical Support for additional troubleshooting and reference this KB article ID#SO8441. It is possible that the transfer belt module will need to be replaced.

Explanation

Color calibration for copy mode is failing and this is likely due to a sensor that has accumulated excess toner.

Contacting Lexmark

LEGACY ID:SO8441

Step

Actions

1

Power the printer/MFP off completely and disconnect the power cable from its power supply.

2

For the Lexmark X74x Color Laser Multi Function Printer:

  • Open the MFPTop Access Cover.
  • Then open theFront Door Assembly.

3

To remove each of the Photoconductor Units, lift the right-end handle of the photoconductor unit (1), releasing from it from the mount. Then lift the unit up and away from the left side of printer/MFP (2), ensuring that the left-side end of the photoconductor is released from the holding pin.

Warning—Potential Damage: To avoid damaging the photoconductor drum, hold the photoconductor units by their handles and place each of the photoconductor units on a clean surface. Never expose the photoconductor units to light for a prolonged period of time. Place a clean, dry cloth over the transfer module and photoconductor units until they are required again. Also be careful not to touch the photoconductor drum. Doing so may affect the print quality of future print jobs.

4

To remove the Transfer Belt Module (TBM), (1) disconnect first the Transfer Module Cable. Then (2) press the two tabs to release the Front Access Cover Assembly. Press the ( 3) two tabs on either side of the Transfer Belt Module (TBM), and lift it out.

Note: Place the Transfer Belt Module (TBM) on a flat clean surface.

5

Re-install or reassemble the Transfer Belt Module (TBM) and the Photoconductor Units in reverse order.

6

Close all doors and covers completely. Connect the power cable to its power supply and power on the printer/MFP.
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