Code :

Code: 55
Display: 55
Description: On IIISi/4Si Printers this is due to the DC controller not receiving the proper information upon startup. Check the connectors on the DC controller and power supply. If you don't hear the motor immediately and you don't have a paper jam, change the power supply.

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

< 1 2 3