Precise Media Detection

Detects media as it passes through the mailbox paper path and provides the timing feedback required for proper output routing.

OEM Fit and Function

Manufactured for the original Lexmark mailbox architecture, helping preserve proper alignment, connection and sensor response.

Broad Platform Support

Used across multiple generations of Lexmark enterprise printers, multifunction devices and managed-print platforms.

Designed for Lexmark enterprise mailbox systems.

Compatibility includes the following printer families and their applicable regional or configuration variants when equipped with the compatible mailbox output option.

OEM-Platform Cross References

Parts-catalog references also associate this component with the Sharp MX-B557P, Sharp MX-B707P and Source Technologies ST9730 platforms. For cross-branded equipment, confirm the installed sensor number and mailbox configuration before ordering.

Symptoms This Part May Address

• Recurring paper jams inside the mailbox
• False pass-through or paper-path jam messages
• Media stopping before reaching the selected bin
• Intermittent mailbox output errors
• Incorrect timing or routing through the mailbox

Before Replacing

• Confirm the mailbox sensor flag moves freely
• Inspect the paper path for scraps or debris
• Check that the sensor cable is fully seated
• Inspect the diverters, belts and drive components
• Verify the installed part number is 40X8719

What’s Included

One genuine Lexmark 40X8719 mailbox pass-through sensor, as pictured.

Not Included

Mailbox assembly, sensor actuator or flag, wiring harness, controller board, belts, solenoids and other components are not included unless specifically pictured or stated.