79 Service

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This error is commonly caused by defective accessories that have been added to your printer such as font cartridges, added memory or I/O cards. Turn the power off on your printer, remove these accessories and turn your printer back on.
 
If the error is gone and you removed only one accessory, that accessory is defective. Contact D/I for a replacement.

If the error is gone and you removed more than one accessory, turn the power off on your printer, reinstall one of the accessories and turn power back on your printer. If the error reappears, that accessory is defective. Contact D/I for a replacement. If the error is still gone, repeat the same steps for your other accessories until you discover the defective part.

Remember to TURN POWER OFF on your printer whenever adding or removing any accessory. If you do not, you will most likely destroy your accessory, resulting in a 79 Service error.

If you do not find any defective accessories or you have no accessories to begin with, then contact D/I for further help.