HP Error Code 51
HIGHCommon IssueHP Error 51: Laser Scanner Motor Malfunction
HP Error 51 indicates a problem with the printer's laser scanner assembly, specifically its motor or related components, preventing proper image formation.
HP Error 51, often displayed as '51.XX Error' where XX specifies a sub-code, points to a critical failure within the printer's laser scanner unit. This unit is responsible for 'drawing' the image onto the photosensitive drum using a laser beam, which is then transferred to the paper. The error typically signifies that the laser scanner motor is not rotating correctly, is stuck, or has failed entirely. Without a functioning laser scanner, the printer cannot create any print output. Common causes include a faulty laser scanner motor, a damaged or disconnected cable leading to the scanner, debris obstructing the scanner's path, or a problem with the main formatter board failing to communicate with or power the scanner. While it can sometimes be a temporary glitch, it often suggests a hardware failure that requires more in-depth troubleshooting or part replacement. This error will prevent any printing operations until resolved.
- 1
Perform a full power cycle: Turn off the printer, unplug it from the wall outlet, wait at least 60 seconds, then plug it back in and turn it on.
- 2
Check for any obstructions: Open all access doors and carefully inspect the paper path and the area around the toner cartridge for any foreign objects or paper scraps that might be interfering with internal components.
- 3
Reseat the toner cartridge: Remove the toner cartridge, inspect it for any damage, and then firmly reinsert it to ensure good contact.
- 4
Update printer firmware: Visit the HP support website for your specific printer model and download the latest firmware. Follow the instructions to install it, as firmware bugs can sometimes cause hardware communication errors.
- 5
Perform a hard reset (if applicable): For some models, a hard reset can clear internal memory. Consult your printer's manual for specific instructions, as this varies by model.
- 6
Inspect internal cables (advanced): If comfortable, carefully open the printer's outer casing (refer to a service manual if available) and check for any loose or disconnected cables leading to the laser scanner unit. Reconnect any that appear loose.
- 7
Try a different power outlet: Plug the printer into a different, known-good wall outlet directly, bypassing any surge protectors or power strips, to rule out power supply issues.
If you have performed all the DIY troubleshooting steps, including a power cycle, firmware update, and checking for obstructions, and the '51 Error' persists, it's time to contact a professional. This error often indicates a failure of the laser scanner assembly itself or the main formatter board, which are complex components to diagnose and replace. Attempting further repairs without proper tools and expertise could cause additional damage to the printer. A specialist can accurately diagnose the faulty component and perform the necessary replacement.
Find a certified printer specialist near you →$200-$500
Actual costs may vary based on location and specialist
- • HP LaserJet Pro M402dne
- • HP LaserJet Enterprise M506dn
- • HP Color LaserJet Pro M452dw
- • HP LaserJet P3015 Series
- • HP LaserJet 4250/4350 Series
This content is licensed under CC BY-SA 4.0 and is original educational material created by PrinterSpecialists.org. Not affiliated with HP.