HP LJ 4, 4M, 4Plus, 5, 5M, 5Plus, 4000, 4050, 5000
11 Paper Out
Paper tray empty or not seated correctly.
Sensor Arm Stuck or Broken - check for free movement of the sensor arm.
Defective Tray Size Sensing or Configuration.
Verify the configuration through the menus on the printer.
Defective Paper Control Sensor PCB.
12 Printer Open
Top cover open or a broken tab on the cover assembly.
Defective paper control assembly or actuator can cause this problem.
Verify the tab on the cover is not broken.
13 Paper Jam
Check the paper, make sure it meets the paper specifications for your printer.
Is the paper size correct? Is the software set for the size you're using? Is the menu set for the size you're using? If the software tells the printer to expect a different size (legal, A4, COM10) than the tray available, you will get an error.
Defective or dirty exit sensor.
Make sure the paper cassettes are installed correctly.
Bad drive gears.
Listen for the motor operation, if not replace the motor or drive circuit.
14 No EP Cartridge
Can also be caused by a defective DC controller
16 Toner Low
Toner cartridge is empty or toner in cartridge is not distributed evenly.
Bad or dirty cartridge contacts
18 MIO Not Ready
The printer is not connected to a LAN when it's expecting to see a LAN. Terminate the port on the printer with a BNC T and two 50 ohm termination's.
The MIO card is defective or maybe just not seated correctly
20 Memory Overflow
A large print job has exceeded the memory capacity of the printer. Verify that the SIMMS or memory cards are seated. Add more memory or simplify the print job.
21 Print Overrun
The print job is too complex; simplify the job.
Enable page protect from the control panel and from the software.
You may need additional memory
22 Error I/O Config
I/O configuration for the computer or printer is incorrect.
Check I/O Cable, I/O port.
23 I/O Not Ready
The I/O card is not accepting data. May not be connected or defective. Watch the termination's on the network cabling
24 Job Memory Full
Simplify the print job.
Add more memory
30 An I/O time-out or a prompt for user interaction like a manual feed has been exceeded. Check the I/O connections and make sure the proper media is being used.
An unexpected PostScript firmware error; reseat the PostScript SIMM and/or replace it.
PCL file was sent to the printer while in PostScript mode or the PostScript file contains bad data. May need to reload your PostScript print driver file
40 Make sure computer and printer are set to the same baud rates.
Check the MIO card, remove, clean contacts, reinstall; replace if defective.
An abnormal connection break may have occurred during data transfer - Press Continue or Go to clear this error message
43 Communication problem between the formatter and an optional interface installed (e.g. network card). See HP LJ II
50 Fuser Error
Defective heater, termistor, termoswich, triac.
51 Loss of beam detect
Improperly seated toner cartridge.
Laser shutter blocked or damaged.
Damaged fiber optic cable.
Defective Laser PCA.
Faulty Laser Scanner Cable Connectors.
Defective Laser Scanner Assembly
52 Incorrect Laser Scanner speed - see 51
55 DC controller not receiving the proper information upon startup. Check the connectors on the DC controller and power supply
57 Main motor problem
Check gear train for binding.
Check connections to DC controller
58 Check the fan - reseat fan cable or replace fan.
Defective DC controller board
59 Add Memory (not enough memory for PostScript option)
79 Software/drivers, Memory PCA's, Font Cartridges, option I/O Cards.
Defective Formatter PCA.
4Plus - Defective toner cartridge
80 Improper MIO connection
Defective MIO Card
Defective Formatter Card
89 PostScript ROM's/SIMM are defective