LiftMaster K41-0391-000 MAXUM EMI Board – 120/240VAC

The LiftMaster K41-0391-000 is a replacement EMI and power-interface board for compatible LiftMaster MAXUM DC commercial door operators supplied with 120VAC or 240VAC input power. It conditions and interfaces incoming AC power with the operator’s internal MAXUM electrical system.

Important: This component is an EMI board, not the operator’s primary logic or main control board.

Features

• Genuine LiftMaster MAXUM replacement board

• Designed for 120VAC and 240VAC MAXUM operator configurations

• Used in compatible 700 and 1200 operator systems

• Provides incoming-power filtering and electrical-interface functions

• Factory connector and mounting configuration

• Dimensions of approximately 5.875 x 4.5 x 1.5 inches

Compatibility

Designed for compatible 120/240VAC LiftMaster MAXUM operators, including properly matched configurations from these families:

• JDC commercial jackshaft operators

• RJDC rolling-door operators

• JHDC commercial hoist/jackshaft operators

• TDC commercial trolley operators

• Compatible 700 and 1200 standard- or extended-duty MAXUM models

Check the complete model number and electrical rating. MAXUM model numbers identify operator style, capacity, duty rating, voltage and phase.

This board is not interchangeable with:

• K41-0390-000 480VAC EMI board

• K41-0388-000MC MAXUM main control board

• K001D8395 Logic 5.0 control board

• Logic 4.0 or older commercial operator boards

Related component: LiftMaster K41-0388-000MC MAXUM Main Control Board

Important Identification Information

The unformatted catalog number K410391000 corresponds to the factory-formatted LiftMaster number K41-0391-000.

Before ordering, verify:

• Complete operator model number

• 120VAC or 240VAC input

• Existing board number

• Connector arrangement

• Operator capacity and production revision

• Whether diagnosis identifies the EMI board rather than the main board

Package Contents

• One LiftMaster K41-0391-000 EMI board

Main control board, transformer, wiring harnesses and additional electrical components are not included unless expressly stated.

Installation & Safety

Replacement must be performed by a qualified commercial-door technician familiar with line-voltage equipment. Disconnect and lock out power, verify the absence of voltage and follow electrostatic-discharge precautions.

Do not diagnose a board solely by visible damage. Incoming power, transformer output, wiring, connectors, motor components and the main board should be tested before replacement. After installation, complete the required operator setup and test limits, controls, brake operation and monitored safety devices.