Printing blank copies, print jobs, and faxes are not printing. the page is left blank. it is not an issue with the drum or ink. however, one of the less technically inclined here in the office was looking for a way to copy on both sides and clearly did something. but since i don't know what he did i don't know how to fix it. any help?

Does it do this on all jobs? If yes, look for a function either in the general setup of the device or the driver for job separation. Having this function on causes the printer to print a blank page between print jobs to help separate them. This not to be confused with the job separation function of the 3 bin sorter where print, fax and copy jobs come out in different bins.

For copy jobs, clean the glass with a soft clean cloth, regularly, not just the 8.5 x 11 screen but the 11-inch x .5 inch strip that copies when using the document feeder. Print job: their is probably dirt or ink on the rolling parts. Q-tips are good for cleaning this up, careful, don't burn your fingers.

Hi,

Are you able to make copy from printer or print test page ?
If you are not able to make copy from printer or print self test page
Check if the cartridges are not empty.
If they have ink, follow the steps below

1. Disconnect the power cable from back of printer
2. While holding the # and 6 button, connect the power cord to printer.
3. It will print the alignment sheet and you will have to re-align the printer and try to print/copy
*Note this is Semifull reset and doing so you may loose fax logs and other fax related setting you have setup on printer.

Or are you not able to print from PC ?

Click the link below to know how to resolve the print job stuck in queue issue.
Link

do a quick check on 2 things.
- Copy a document(put a printed page on document feeder and press Copy button) , has the Copy come ok? if copy is also blank that means toner/ink problem, needs to be replaced.

- check with your Fax receive Print settings. is any setting of econo mode/ contrast/brightness Off the track? If found any of such issue then Reset it or put it on average (middle).

Hope this will put your Brother on the track

All blank pages could either mean: On the scanner side: * Mechanical error, you'll need to perform service on it to reanimate it again. * You can check if it is on the scanner side by printing a test page on the printer. If it prints fine, the problem is in the scanning process.
On the printer side: * Dirty connectors between toner/drum unit and machine. Remove the toner/drum package and clean the metallic cylinders on the left and right side of the toner/drum unit, then reinsert package into machine. * Bad toner and/or drum unit. Replace should solve it. * Mechanical error, you'll need to perform service on it to reanimate it again. * You can check if it is on the printer side by either scanning to a connected PC or sending a fax to someone. If the scanned/faxed page looks fine on the pc/fax that receives the fax, the problem is in the printing process.

I need more information. If you make 20 copies do you still notice the problem or only when you receive a fax. What is your copy count (press life 1). Does it jam or make noises. At first glance I would say phone line problem. .

Every print job, copy, and fax have the solid black line across the pages. I have changed the drum and the cartridge and even tried cleaning mode. Please help!!! I have a HP Laser Jet 2840 All in One

If the dial tone sounds NOISY or SCRATCHY there probably is a phone line problem. Try changing the phone cord first. Are you using DSL phone service?

You have a very reliable fax machine.

are copies light too? if not then it is sending fax, but most times it is inferior ink or drum causing the problem sometimes damp paper (try printing on reverse side as well)

Have you tried both drum and toner supplies? cause it sounds like a drum fault, if you have tried a new drum and toner, and it is doing it when printing internal reports, receiving fax's and copying then you have a tecnical issue to do with charge and this would likely render machine unecomical to repair (unless you can find a bad contact with drum on machine). If it receives faxs clearly but copys black then it is different issue (ie optics).