Error 69

ALL HP LASER PRINTERS
1. Defective I/O pca.
2. Defective formatter pca.

HP LASER PRINTER 1200, 2200, 3100, 3200, 4100
1. Temporary error.
2. Reseat duplexer.
3. Replace duplexer.

HP LASER PRINTER 4500
1. Duplex mechanism failure.
2. Duplex slide adjust has failed.
3. Temporary error.

HP LASER PRINTER 9000
1. Temporary error.
2. Reseat duplexer.
3. Perform a paper path test.
4. Replace duplexer.

Error 70

ALL HP LASER PRINTERS
1. Personality cartridge or SIMM installed in font or SIMM slot is incompatible with the printer.

HP LASER PRINTER 5SI
1. Faulty MIO cards.

Error 72

ALL HP LASER PRINTERS
1. Font cartridge removed during formatter access.
2. Defective font cartridge.
3. Defective formatter pca.

Error 79

• 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
  

Error 80

ALL Printers
1.  Improper MIO connection - look at pins on formatter MIO connection
2.  Defective MIO Card - Replace card
3.  Defective Formatter Card - Replace card 

Error 81

ALL PRINTERS

1. Defective formatter pca.