Faint grey lines Every 1/3rd of a printed page

Hi,

Please clean the drum of the printer and then print 5 to 9 test pages to check the effect of the cleaning of the drum on removing the black lines.

Thank you.

try to stop the sheet just before it enters the fuser and see if the marks are on the paper already. if not then it has to be the fuser if they are them you have another issue.

Replace the toner cartridge :-)

I’m happy to help further over the phone at https://www.6ya.com/expert/ron_9356d26241d4cbf7

if it's a laser printer check your drum(s) and fuser

The printhead has either become too clogged to flush out with with the internal cleaning operation (which uses a LOT of ink), OR, the nozzles are not firing. If after several cleaning operations there is still no significant improvement, you will need to replace the print head. I see this frequently with Canon and Epson, and Brother inkjet printers. Usually, it is due to leaving the printer idle for too long, or removing a cartridge and not replacing it right away. The air gets to the residual puddle of ink in the head and dries it.

You can find the replacement print head by Google searching "MP830 print head". Prices can vary from around $70 - $90. Changing it out is fairly simple. You only need to lift a lever that holds the head in place. Make certain that it is squarely seated, and then run a few pages of a color document, or do a couple of standard cleaning operations to "prime" the head.

Make sure the hed is NEW and not used or "refurbished". Here is one source on eBay that sells it for $78.00:

http://compare.ebay.com/like/330643273134?var=lv&ltyp=AllFixedPriceItemTypes&var=sbar&_lwgsi=y

There will be a flap at the back that drops out and down to give access to the fuser for clearing jams and "straight through" printing. Four lines repeating down the page is equally likely to be be a mark on the cartridge drum, possibly from the Primary Charge Roller if the unit has been very hot or not used for a period of time in higher temperatures. Remove the toner cartridge and in LOW light manually rotate the drum using the gear at one end of the cylinder. Look for a scuff mark right across the drum or a black/grey line. You may be able to clean the drum with a cotton ball and alcohol. Try the print again and see if there is any improvement. If you have another cartridge in hand you might try that to verify cartridge or fuser.

check the optics section the remove the exposure glass anh clean the fisrt,second, and third mirror

Are they lines from one edge to the other in a straight line. Or is it faint reprint across the page?
Thin lines would most likely be a bad drum or cleaning blade.
If it is faint reprint it is the heat roller in the fuser.