My brother HL 4070 CDW printer says to change the belt. What do I do?

Make sure that the toner cartridges are installed properly.Make sure that the drum unit is installed properly.Make sure that the belt unit is installed properly. Perform the calibration. Adjust the colour by using the custom setting in the driver and by using the control panel. Colours the printer can print and colours you see on a monitor are different. The printer may not be able to reproduce the colours on your monitor. Make sure that you use paper that meets the printer's specifications. Put in a new drum unit.Put in a new belt unit. Check the printer's environment. Conditions such as high humidity and high temperatures may cause this print quality problem.Identify the colour causing the problem and put in a new toner cartridge. If the problem continues, put in a new drum unit. Also visit >>
Image Defect Troubleshooting

I think you hav low or bat toner cartridge or dirty feed rollers. If a replacement cartridge doen not fix your problem then your printer needs cleaning/servicing.

Hi there !
this is a commun problem for all the printers, you should clean you printer's inside !
for that printer you habe to check all the way where the paper moves.

Try swapping the black and the magenta (red) cartridge.
This will not damage the printer and you can see if the toner or the drum is defective.

If you get a red page, drum
Black page, toner cartridge

With the front access door open, press and hold the cancel button. While still holding the down the cancel button, press and hold the reprint button... you should now see the toner reset menu. Why we can't get there from the machine info/reset menu to begin with, well, guess Brother wants to sell you more toner. ;^)

like the name suggest, it collects waste toner. Any toner that is left over from the print process is waste toner. Once the waste toner bottle is full, the printer will stop working until You have replaced it with an empty waste toner bottle. So in short, if it is telling u to get a new one, get one or the other option is to empty it yourself which is very messy and if u dont clean the bottle of all toner dust, may not even work.

You might not be on the wireless network or the printer might not be on the wireless netowrk. try connecting to it via a usb cable and see if that works. if so try reconfiguring the settings on it for your wireless network than try again. Also if you have the disk the printer came with you can uninstall the printer put back in the disk, reinstall the printer and it might do all that I am saying automatically.

The green tabs that you have to slide are under the color cartridges, so remove the three color cartridges and you will see three green tabs, to slide the tab across the wire you have to first open the translucent plastic wire cover, then slide the green tab across the wires and return it to it's original position, close the wire covers, replace the color cartridges, and reassemble the printer. All the Best

If it's the same as the Brother 4070 you go into printer proerties (press properties next to printer selector after sending a document to print).  Choose the advanced tab, on this tab near the top are five buttons with icons on, the second one shows two pages with A and B on, press this to access the duplex and binding options.  In there change from "flip on top edge" to "flip on left edge"

Try to unplug your printer and leave it for 1 to 2 hours.