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Lexmark MS421

Lexmark MS421

The Control Panel, Home Screen or LED Indicator Stays Off During Printing

Affected products



in the title section above.

Issue description

It has been observed that while printing a document, the printer's Control panel or LED indicators remain OFF.


Device Behavior

The device has a 15-minute default sleep timeout. Once the device is in sleep mode, any job received will be printed without the Control panel or LED indicator powering ON. Once printing is done, the device returns to the sleep mode immediately. This is different than most previous products where the Control panel or LED indicator powers ON when printing.

The Control panel or home screen will power ON whenever the user interacts with it or wakes the device up.

This behavior is NOT a defect and is functioning as designed (FAD). Its main purpose is conservation of energy for the new generation of products.


To disable this feature and for the Control panel to power ON whenever a print job is received, navigate to;

Settings > Device > Power Management > Sleep Mode Profile

Change the setting Allow printing with display off to

Display on when printing


Still need help?

If you need additional assistance, please close this browser tab or go to the Lexmark support site, type your printer model and locate

Get in Touch with Lexmark! for contact information.
When calling for support, you will need the following:

  • Affected printer model/s
  • Printer serial number

Please be near the product/s described in this article to expedite the support process and reduce callbacks.


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