HP Laser Jet Printer M651N

[dominion1954]

I am a printer tech and been dispatched to this client for the third time now with the issue being shadowy background on the pages. I ran a quality test and sure enough the issue appeared on the Magenta page only so I swapped out teh toner and it cleared it right up. About two weeks later another call, same issue, same cartridge. Swapped out cartridge and the issue cleared up. Now they are calling and saying the Cyan is doing the same thing. Error log says calibration error. Belt looks good, fuser looks good. I have done a full calibration and doesn't take care of it. Am I missing something here?

Thanks Paul

[davidzuts]

Defects like this can only come from the toner cartridges. If the customer is using hp original toner cartridges you should be able to return the defective cartridge to place of purchase for refund or exchange. I would run a supplies status page to see what percentage the toner cartridge has left. Include that page when returning the toner cartridge. You may want to upgrade the printer firmware as there was an issue where the true amount of toner left in the toners was being over reported so toners reached there end of life before the printer told the user. If when you replace a toner cartridge, the print quality issue goes away, then the issue has to be the toner cartridge and nothing else. If there was something in the printer causing the issue it would have happend to all 4 toners or would happen to only 1 toner but since it is now happening to another color I would think you just have a bad run of toners.