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Diagnosing and Troubleshooting HP LaserJet Jams, Image Defects And Error Messages

Troubleshooting print defects, paper jams, error codes, and printer noises.


This article helps printer service technicians trace the potential sources of common problems and issues on mono chrome HP LaserJet printers. Issues that include print defects, paper jams, error codes, and printer noises.


Image Defects

High percentage of print defects come from a faulty toner cartridge. Even if the cartridge is somewhat full, other components can fail within the cartridge and cause defects. A halfway test can help eliminate the fuser as the problem.

Troubleshooting Laser Printer Parts and Techniques With The Halfway Test Or Stop Test


Paper Jams


Which paper tray does the Paper jams at?

1. All trays

2. Manual feed tray only

3. Main cassette tray only

4. Optional cassette tray only


Where does the leading edge of the paper stop?

1. Never leaves the tray

2. Stops underneath the toner cartridge

3. Stops inside the fuser, or just exiting the fuser

4.  Stops only when duplexing

5.  Stops as it exits the printer


Error codes and messages


Numeric error codes:

Error Codes 0 - 19

Error Codes 20 - 49

Error Codes 50-59

Error Codes 60 and up


Text error messages:

Text Error Messages A - M

Text Error Messages N -Z


Printer Noises Location

What area of the printer does the noise seem to be coming from, the front or rear?

-- Rear noises are usually fuser, drive gears, or output assembly

-- Front noises are usually pickup rollers, toner cartridges, laser scanners


What kind of noise: high-pitched squeals, or low-pitched rumbling?

Higher-pitched noises are usually:

-- printer toner cartridge

-- printer laser scanner

-- printer output assembly


Lower-pitched noises are usually:

-- worn printer roller

-- worn printer gear

-- damaged fuser


Does paper actually leave the tray?