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Error code reference

Samsung Multifunction Printer Error Code U2-1113

LSU motor does not work normally.

Samsung codesSamsung multifunction printer codes

LSU motor does not work normally.

First step from the service manual

Execute the LSU motor test in EDC mode; check LSU motor operation sound.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What U2-1113 means on a Samsung multifunction printer

The U2-1113 error code on a Samsung multifunction printer indicates that the LSU (Laser Scanning Unit) motor has failed to operate within normal parameters. The LSU is a critical subsystem responsible for directing the laser beam across the photosensitive drum during the image formation process. The motor within the LSU drives the polygon mirror that deflects the laser at precise intervals, and any deviation from expected rotational speed or startup behavior will trigger this fault code.

When the printer's control board does not receive the correct feedback signal from the LSU motor, it interprets this as a motor malfunction and halts the print cycle to prevent image quality defects or hardware damage. This can stem from a failed motor, a wiring harness issue between the LSU and the main board, or a seized or obstructed polygon mirror assembly. In some cases, the LSU unit itself may have internal component failures that cannot be serviced individually.

Diagnosis begins by entering EDC (Engineering Diagnostic Check) mode and running the dedicated LSU motor test. During this test, a technician should listen for the characteristic spin-up sound of the polygon motor. Absence of sound, erratic noise, or a grinding tone all point to different failure modes: complete motor failure, intermittent electrical connection, or mechanical obstruction respectively. Confirming the harness connections between the LSU and the control board is essential before condemning the LSU assembly itself.

Source: manufacturer service documentation.

Common causes of U2-1113

  1. 01

    Failed LSU polygon motor

    Part replacement

    The motor that spins the polygon mirror inside the LSU has burned out or seized. During the EDC motor test, the unit will produce no spin-up sound or will fail to reach operating speed.

  2. 02

    Loose or damaged LSU wiring harness

    Wiring / connection

    The connector or wiring between the LSU and the main control board may be disconnected, corroded, or damaged. Inspect the harness for visible wear, bent pins, or loose seating at both ends.

  3. 03

    Defective LSU assembly

    Part replacement

    Internal component failure within the LSU beyond just the motor, such as a damaged mirror or failed motor driver circuit, can also trigger this error. Replacing the entire LSU assembly is typically required in this scenario.

  4. 04

    Main control board failure

    Part replacement

    If the control board is not sending the correct drive signal to the LSU motor or is misreading the feedback signal, the U2-1113 error can appear even with a functional LSU. This is less common but should be considered after ruling out the LSU and its wiring.

See the test procedure for each cause

Frequently asked questions about U2-1113

What does U2-1113 mean on a Samsung multifunction_printer?
The U2-1113 error means the LSU (Laser Scanning Unit) motor is not operating normally. The LSU motor drives the polygon mirror that steers the laser beam during printing, and the printer's control board has detected that the motor is not functioning within expected parameters. The printer will halt operation until the fault is resolved.
Can I fix the U2-1113 error myself?
Basic checks like reseating the LSU wiring harness are within reach for a technically confident user. However, the primary diagnostic step requires accessing EDC mode and running a specific motor test, which is typically reserved for trained technicians. If the LSU motor or assembly itself has failed, replacing the LSU unit is the most reliable fix and involves disassembling internal printer components.
Will resetting the printer clear the U2-1113 error?
A simple power reset is unlikely to permanently clear the U2-1113 error because it is triggered by an active hardware fault, not a software glitch. The error will typically return as soon as the printer attempts to initialize the LSU motor. The underlying cause must be identified and corrected before the printer will resume normal operation.
Is it safe to keep using the printer with a U2-1113 error?
The printer will generally stop functioning when this error is active, so continued use is not possible without repair. There is no significant safety risk to the user from this particular error, as the printer halts operation automatically. Attempting to force the printer to bypass the error is not recommended, as it could lead to further internal component damage.
How much does it cost to repair a U2-1113 error on a Samsung printer?
Repair costs depend on the specific failed component. If only the wiring harness needs reseating, the cost may be limited to a service call fee, typically in the range of $50 to $100. If the LSU assembly requires replacement, parts and labor combined can range from $150 to $400 or more depending on the printer model and service provider. In some cases, the repair cost may approach the value of an older printer, making replacement worth considering.

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