What does error 79 represents on okipage 14e

78 does not show in the manuals as a valid error. The link you attach is for error 79. 79 is a critical error usually related to memory failures. Disconnect the printer from the computer and power off and on. If it comes to ready it might be corrupt print job. If it still has a 79 error then you may have a bad memory chip but if you have no added memory it will be the memory built in to the formatter that is bad and that would mean replacing the formatter.

Who told you to change the belt? 79:04 is a Firmware error.
Switch the Printer Off and wait a few minutes. Switch the Printer On again and check if the Error Code has disappeared. If the Error Code reappears, check for a new Firmware release. If the new Firmware release does not solve the problem, or if new Firmware release was not available, then contact the HP Response Center supplying the following information: - Model and Serial Number of the Printer. - Firmware release of the Printer
- The complete Error Code information, including the linefeed where the error occurred

System Error: 79:YZ (YZ=04 Upgrade System Firmware)
Problem Description: Generic Firmware error.
Corrective Action: Try the following:

• Switch the Power OFF from the back of the Printer and disconnect the Power cord. Reconnect the power cord and power On the Printer.
  

• Check that the Printer has the latest Firmware version. If not, update the Firmware to the latest version.

Please check the paper type. To make sure it is compatible. Also to make the paper tray insert properly too. Thanks

The 79:04 error is a "GENERIC FIRMWARE" error.
Go to www.hp.com support and drivers and update the printers firmware.

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Fuser unit error (ERROR 71), (ERROR 72), (ERROR 73)

it is either a bad fuser unit that has to be replaced or a bad thermistor inside the unit which can only be serviced by a technician.

From memory, I think you enter maintence mode my power on when holding down menu key then arrow to drum reset. If not post back and I'll look at user manual

Maybe you won't be able to use A4 paper, which I think is 3/4 inch longer than letter-size 8 1/2 x 11, according to the sizing inside the paper tray of my OKIPAGE 10e. My computer, using Windows 98, doesn't list OKIPAGE 10e among the printers I can use with my computer. Yet, Windows 98 has incorrectly identified my printer as Okidata OL-600e for some reason. I'm surprised my printer works at all with Windows 98. Thanks for detailing your question as "when I print a test page (from the printer controls), because I was unaware I could print a test page using printer controls, so I started pressing anything that looked like an electronic button on the top of my printer. I believe this trial and error eventually helped me to get rid of an unwanted 1 inch wide bar, from top to bottom of 8 1/2 x 11 pages about 2 inches from the right-hand-side of my pages. This was progressively getting worse. I thought I was going to have to buy a new printer. I bought this printer used, and without instruction booklet, so I used your info. about printer controls and started pressing electronic buttons. It's amazing, because after I made about 35 copies, now the annoying 1 inch wide black bar is gone!