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Re: printing problem with lanier 6720 printer
With Analogue copiers the mirrors can get dusty and cause the resulting copies to be dark. Remove the original glass (with the machine powered off of course) and carefully clean mirrors with a clean cloth. Try not to move mirrors as it could go out of alignment (very bad!!!). Other than that the drum may have failed in which case the only thing for it is to replace the drum and it will probally need other parts at the same time.
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I not sure why you need to do a reset for? Did you refill your toner cartridges and your printer still wont print, showing a message in effect stating " Printer Cartridges Empty " or something to that effect, I can tell you hoe to reset the printer to accept the newly filled cartridges. (1) Turn off your computer then power down your printer. (2) unplug the USB cable where it enters the printer. (3) Power up your printer and remove all cartridges. (4) Make sure the cartridges holders are in the locked position and power down your printer , wait 20 seconds then turn it on again. (5) repeat the power on/off cycle 5 times leaving the printer power on long enough for it's " seek and find " cycles typically about 8-12 seconds. This will reset the printers count memory of the last 5 cartridges used. This procedure will work for MOST printers that use a RF IC chip that monitors how many pages have been printed by the printer. This is especially true of Lexmark printers, the number one printer manufactures who uses this technology. When you post questions in any forum here, try and leave the make, model number and the specifics of the nature of your problem. Without any further details I would be shooting in the dark in regards to doing a factory reset. A reset to accomplish what end result. if your question is in regards to doing a reset to get your printer to accept a refilled toner cartridge, above mentioned procedures should work. BOL.
This is just a shot in the dark, but if there is no "reset" button, you might try unplugging it for a couple of minutes and it should reset itself. Just a guess. If you have an owners manual, I would check there to find how to solve this problem, but this may indicate the print heads are damaged in that area. You might enter the "menu" if there is one, and run any maintenance tools available to see if that corrects the problem. If you don't have an owner's manual, you might be able to find one at the printer manufacturer's website in the support section. This would give you a better idea if the problem was a do-it-yourself fix or whether you will need technical help.
U14 is a user code for waste toner full.
Open front cover and you will see a clear plastic bottle at the bottom of the machine; lift this out and dispose carefully of waste toner (do not reuse). When fitting back into machine, make sure that inside of bottle is clean as the detection sensor looks through the bottle to see if it is empty and if toner is covering inside of bottle, the message will remain.