HP LaserJet 4000

• Code: 57
• Display: 57
• Description: Main motor problem, check gear train for binding. Check connections to DC controller - replace main motor
  Check gear train for binding. Replace main motor

• Code: 58
• Display: 58
• Description: Check the fan cable - reseat cable or replace fan
  Defective DC controller board - replace

• Code: 59
• Display: 59 Add Memory
• Description: Not enough memory for PostScript option. Verify SIMM's are seated properly, replace any defective

• Code: 79
• Display: 79
• Description: Software/drivers, Memory PCA's, Font-Macro-Personality Cartridges, option I/O Cards. Defective toner cartridge in the Laserjet 4 Plus only. Remove any accessories (font cartridges, memory PCA's, SIMMs, etc.) plugged into the formatter card and try again. If the problem persists and is application specific, verify proper setup with application vendor.
  Defective Formatter PCA - Replace with known operational board and try again.

• Code: 80
• Display: 80
• Description: Improper MIO connection - look at pins on formatter MIO connection
  Defective MIO Card - Replace card
  Defective Formatter Card - Replace card

• Code: 89
• Display: 89
• Description: The PostScript ROM's have bent or broken pins inspect the pins and reseat if necessary
  Check to see that the ROM SIMM's are in the proper location and oriented properly
  This can also be a temporay error, try power cycling the printer
  The PostScript ROM's/SIMM are defective