The pages are printing off center.

Needs Drum If you pull the drum unit out you will see on the drum different shades of color lighter is wear the lines come from. Buy a rebuilt drum much cheaper and they work, may have to reset the drum count if the change drum lite on...

Run a half test.
Put paper in the manual feed tray.
Print something, anything
When the paper is 1/2 way into the printer, open the cover.
Pull out the toner cartridge. Look down at the paper.
Does it have a black line on the right side?
If yes, replace the cartridge. If no, replace the fuser.

Follow these steps to change print settings, and then print in Mac OS X 10.6. Step one: Select your product

1. In the program from which you want to print, click File , and then click Print . Figure 11: Click File, and then click Print
2. Select your product from the Printer: drop-down list.

Step two: Change print settings

1. Type the number of copies to print in the Copies text box.
2. If you want to print multiple copies, select the Collated check box to print the pages of each copy in order.
3. Select the pages of the print job that you want to print. To print all pages, select All. To print a specific range of pages only, type the page number that begins the page range in the From text box. Then, type the page number that ends the page range in the To text box.
4. Select the size and type of paper loaded in the product from the Paper Size drop-down list.
5. Select the orientation for your print job. To print in portrait orientation, click the icon on the left. To print in landscape orientation, click the icon on the right.

Step three: Change the paper type and quality settings

1. After the Orientation section, click the drop-down, and then select Paper Type/Quality . NOTE: This drop-down usually defaults to the program specific drop-down. In this example, the drop-down is the TextEdit drop-down. Figure 12: Select Paper Type/Quality
2. Adjust the Paper Type setting to match the paper loaded in the product.
3. Adjust the Quality setting to change the print quality of the printed page.
4. Select Print Borderless to print photos without a white border.
5. To change the color profile or to turn on Photo Fix, click the arrow next to Color Options to display the Color Options menu. Figure 13: Color Options menu 1 - Paper Type/Quality menu options 2 - Color Options menu (only available if you click Color Options)

Step five: Print the print job After all the settings match the needs of the print job, click Print on the Print window to print the document or print job.

Are you using the bypass tray for the second run? If so, of course you have a problem with the bypass paper path. As you might know, the workaround is to place the printed page face down on top of the paper stack in the input tray. . I would be amazed that if you tried to run it this way (page on stack) that the machine would cough it up. That would amaze me. Try running sparcely printed stuff through, stuff printed on only one side of the page, then the other, then the center, etc. Could be that there is some sensor in there that doesn't like black toner marks just to see what is going on. Then go from there by asking online with that info. . Good luck.

I was getting a similar blur/blob down one side of the paper (with no discernable print anywhere,) but after removing and emptying the toner collection bottle my printing returned to normal. I am still working on the size mismatch issue, which seems to be prevalent in the 2300DL population.

either you neede a new drum or this is problem in the fuser section. may be baf heater roller. try cleaning the grid on the drum cartridge with a soft bristel pauint brush good luck brother sr tech

Step1
If you're setting up the printer or changing the toner or ink cartridge for the first time, double-check the instructions to make sure that you installed the cartridge correctly and, for new printers, that you have removed all the pieces of cardboard or plastic packing material. 
Step
2
Check to see whether paper is feeding from the paper tray. If it's not leaving the tray at all, try feeding a page manually (if that's an option) or using a different paper tray. Sometimes a problem with the tray can be traced to a broken spring or a piece of plastic. 
Step
3
If paper is feeding from the tray but jamming in the printer, examine where the jam is occurring and then inspect the printer carefully to see if you can find what is causing the problem. A piece of paper, for instance, might be blocking the paper path. 
Step
4
If paper is feeding through the printer but coming out blank, check to see whether the printer is out of toner or ink. A defective toner or ink cartridge could be the problem.

It may be the fuser. Take it out and inspect the roller on it:

1. Switch off the device, disconnect the mains plug and wait for 30 minutes before continuing.
2. Ensure that the bypass tray is closed, or you will not be able to open the front cover.
3. Open the front cover by pressing the release buttons as shown.
4. Pull the front cover down towards you.
5. Disconnect the green plug - squeeze the sides of the plug and pull.
6. Push the left and right levers outward to unlock the unit.
7. Pull the unit towards you as shown and lift it clear of the device.
8. Check the roller for wear marks, If so replace it.

If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe




I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

There is a tiny spec on the scanner glass. Cleaning it will make the line go away.

It sounds like a defective toner cartridge. Try replacing it. If that does not cure the problem, then the fuser assembly needs to be replaced, in which case it is probably cheaper to buy a new one.

Good luck
John