HP Printer Error U2-1113: Complete Technical Guide to Causes, Diagnosis, Troubleshooting, and Repair

HP laser printers are widely recognized for their reliability and excellent print quality. However, like any precision electronic device, they can occasionally display hardware-related error codes that interrupt normal operation. One such error is U2-1113, which is commonly associated with the Laser Scanner Unit (LSU) or its communication with the printer's main controller.

Unlike software or driver issues, U2-1113 is generally a hardware fault, requiring systematic diagnosis rather than reinstalling drivers or resetting Windows.

This guide explains everything technicians, service engineers, and IT administrators need to know about HP Printer Error U2-1113.

What Does Error U2-1113 Mean?

Error U2-1113 indicates that the printer has detected an abnormal condition in the Laser Scanner Unit (LSU) or the circuitry responsible for controlling it.

The Laser Scanner Unit is responsible for directing the laser beam across the photosensitive drum to create the latent image before toner is transferred onto paper.

If this unit fails to initialize, rotate correctly, or communicate with the printer's main board, the printer immediately stops operation and displays U2-1113.

Common Symptoms

Users may observe one or more of the following symptoms:

• Printer displays U2-1113 on the LCD.
• Printing suddenly stops.
• Blank pages are produced.
• Printer initializes but immediately enters an error state.
• Continuous restarting during startup.
• Grinding or abnormal motor sounds.
• Printer remains stuck during initialization.
• Scanner motor fails to rotate.

Models Commonly Reporting U2-1113

Although model availability varies by region, this error has been observed in several HP laser printers, including:

• HP Laser 107 Series
• HP Laser 108 Series
• HP Laser MFP 135 Series
• HP Laser MFP 136 Series
• HP Laser MFP 137 Series
• HP Laser MFP 138 Series
• Similar Samsung-engine HP laser models

How the Laser Scanner Unit Works

The Laser Scanner Unit consists of:

• Laser diode
• Polygon mirror motor
• Polygon mirror
• Focusing lenses
• Reflective mirrors
• Synchronization sensor
• LSU control PCB

During printing:

1. Printer receives print data.
2. Formatter processes the image.
3. Laser diode emits laser light.
4. Polygon mirror rotates at high speed.
5. Laser beam scans across the drum.
6. Electrostatic image forms.
7. Toner develops the image.
8. Paper passes through transfer and fuser units.

If any component in this sequence fails, the printer reports an LSU-related error.

Primary Causes of U2-1113

1. Failed Laser Scanner Unit 🔗

The most common cause.

Possible reasons:

• Worn polygon motor
• Damaged laser diode
• Failed synchronization sensor
• Internal LSU PCB failure

2. Loose Ribbon Cable 🔗

A partially disconnected LSU cable prevents communication between the LSU and the formatter board.

Symptoms include:

• Random errors
• Intermittent printing
• Startup failures

3. Main Controller PCB Failure 🔗

If the formatter cannot communicate with the LSU, the printer assumes the LSU has failed.

Possible reasons include:

• Damaged controller IC
• Burnt driver circuit
• Corrupted hardware interface

4. Power Supply Problems 🔗

Insufficient voltage can prevent the polygon motor from reaching operating speed.

Check:

• Power board
• DC controller outputs
• Internal voltage regulators

5. Mechanical Damage 🔗

Physical damage caused by:

• Printer drops
• Dust accumulation
• Liquid contamination
• Excessive vibration

Diagnostic Procedure

Step 1 – Restart the Printer 🔗

• Power OFF.
• Disconnect power.
• Wait five minutes.
• Restart.

Temporary controller faults may clear.

Step 2 – Remove the Toner Cartridge 🔗

Inspect for:

• Broken parts
• Loose components
• Toner leakage
• Foreign objects

Reinstall securely.

Step 3 – Listen During Startup 🔗

A healthy printer normally produces:

• Fan starts
• Main motor rotates
• Polygon motor spins

If the polygon motor never starts, suspect the LSU.

Step 4 – Inspect Internal Connectors 🔗

Check:

• LSU ribbon cable
• Main PCB connector
• Bent pins
• Oxidation
• Burn marks

Reconnect all cables securely.

Step 5 – Check Power Supply 🔗

Measure DC voltages using a multimeter.

Verify:

• 5V
• 12V
• 24V (where applicable)

Low voltage may prevent LSU initialization.

Step 6 – Inspect the LSU 🔗

Look for:

• Dust
• Broken mirrors
• Jammed polygon motor
• Damaged optics

Avoid touching optical surfaces.

Step 7 – Replace the LSU 🔗

If available, install a known-good LSU.

If the error disappears, the original LSU is defective.

Step 8 – Test the Main PCB 🔗

If a replacement LSU produces the same error:

• Inspect formatter board.
• Check communication signals.
• Replace the controller board if necessary.

Service Tools Required

Professional technicians should have:

• Digital multimeter
• ESD wrist strap
• Phillips screwdrivers
• Plastic pry tools
• Magnifying lamp
• Tweezers
• Compressed air
• Cleaning swabs
• Isopropyl alcohol (90% or higher)

Preventive Maintenance

To reduce LSU-related failures:

• Clean the printer regularly.
• Keep the printer dust-free.
• Use genuine toner cartridges.
• Avoid humid environments.
• Protect against power fluctuations using a UPS.
• Do not block ventilation openings.
• Perform scheduled maintenance.

Common Misdiagnoses

Many users mistakenly believe the problem is caused by:

• Windows updates
• Printer drivers
• USB cables
• Network configuration
• Print spooler
• Firmware corruption

In most cases, U2-1113 is a hardware-related issue.

Technician Troubleshooting Flow

1. Restart printer.
2. Remove and reinstall toner.
3. Check for paper jams.
4. Listen for polygon motor operation.
5. Inspect LSU connectors.
6. Verify power supply voltages.
7. Clean optical components.
8. Replace LSU.
9. Replace main PCB if necessary.
10. Perform a complete print test.

Can Firmware Cause U2-1113?

Firmware issues rarely generate this error.

Firmware updates should only be considered after hardware faults have been ruled out.

When Should the Printer Be Repaired?

Professional repair is recommended when:

• Error appears immediately after startup.
• LSU motor does not rotate.
• Blank pages are produced.
• Error persists after power cycling.
• Internal inspection confirms hardware failure.

Frequently Asked Questions (FAQ)

Is U2-1113 caused by Windows? 🔗

No. It is generally a hardware fault inside the printer.

Can reinstalling drivers solve the issue? 🔗

Usually not.

Can toner cartridges cause U2-1113? 🔗

Only indirectly if they interfere with internal mechanisms. The toner itself is rarely the root cause.

Is replacing the LSU difficult? 🔗

Experienced technicians can replace it with standard service tools, though careful handling of optical components is essential.

Should I update firmware first? 🔗

No. Diagnose hardware before attempting firmware updates.

Best Practices for IT Administrators

• Keep spare LSUs for high-volume environments.
• Maintain clean printer interiors.
• Schedule preventive maintenance.
• Use quality power protection.
• Record recurring hardware faults.
• Train support staff on hardware diagnostics.

Conclusion

HP Printer Error U2-1113 is primarily associated with the Laser Scanner Unit (LSU) or its communication with the printer's controller board. While basic checks such as power cycling and cable inspection may resolve simple issues, persistent errors generally require hardware diagnosis and replacement of the faulty component. Following a structured troubleshooting process minimizes downtime, reduces unnecessary part replacements, and helps restore reliable printer operation efficiently.

 

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