The Xerox 961K17840 is a genuine OEM MCU PWB (Main Control Unit Printed Wiring Board) for select Xerox multifunction printers. It controls key system functions and ensures reliable device performance.

The Xerox 961K17840 MCU PWB (Main Control Unit Board) is an OEM service part that serves as the primary logic/control board in supported Xerox multifunction printers.

It processes system commands and manages communications between the printer’s key subsystems, including the engine controller, scanner, power supply units, sensors, and finishing accessories.

When the MCU PWB fails, devices may exhibit:

• Failure to boot or initialize

• System error codes or freezes

• Communication errors with subsystems

• Unstable or inconsistent operation

Replacing the 961K17840 MCU PWB restores system functionality, ensuring reliable printer operation and protecting other hardware components.

This is a service-grade component, usually replaced by Xerox-certified technicians or experienced service providers.