My HL2040 laser printer will print "Print Settings" page but otherwise will not print at all.

If the lines go all the way down the page, check the position of the corona wire cleaner tab (blue or green) at the top front of the drum unit. if not parked fully to one side it will create a solid black lines where it blocks the laser. Otherwise look for some other foreign object (or torn paper piece) that may be blocking the laser from the drum. If the lines are thin and shark, check for scratches on the drum (not repairable without replacing drum). If the lines are uneven thickness but in a pattern that repeats down the page every few inches, then the film on the drum is probably worn or wearing away and the drum needs to be replaced.

The problem with this is the design. Each toner cartridge has a microchip on it, that counts the pages you print. The company has determined that you get x amounts of prints. Then you have to replace it, empty or not. This printers do not work the same way as an expensive professional business copier. In an pro style there is a spent toner cartridge that collects all of the wasted toner that is on the drum. On a small business/home style this spent toner goes back into the cartridge. There is no level indicator, even on the inkjet printer. They too, have a chip that says you have x amount of prints/cleaning cycles they can go through. Look up inkjet refill kits or inkjet cartridge programmer.

You can find the usre's manual here:

http://welcome.solutions.brother.com/bsc/public/us/us/en/doc/manual_index.html?reg=us&c=us&lang=en&prod=hl2140_all&dlid=&flang=English&type2=-1
1) If the LARGE BLUE BUTTON is blinking:
Data remaining in memory
There is remaining print data in the printer memory. If the Ready LED is blinking for
a long time and nothing has printed, press the Go button to print the remaining data
in the memory.
2) If the TONER LED is blinking:
Toner low
Indicates that the toner cartridge is nearly empty. Buy a new toner cartridge and have
it ready for when Toner life end is indicated.
The Toner LED will turn on for 2 seconds and off for 3 seconds.
3) If the DRUM LED is blinking:
Drum life end soon
The drum unit is near the end of its life. We recommend that you get a new drum unit
to replace the current one. See Replacing the drum unit on page 69.
The Drum LED will turn on for 2 seconds and off for 3 seconds.
4) If the RED ERROR LED is blinking:
Front cover is open
Close the front cover of the printer.
Fuser cover is open
Close the fuser cover located behind the back cover of the printer.
Paper jam
Clear the paper jam. See Paper jams and how to clear them on page 85. If the printer
does not start printing, press the Go button.
Memory full
The printer memory is full and the printer cannot print full pages of a document.
Print overrun
A print overrun occurred and the printer cannot print full pages of a document.

it may be the drum issue . replace the drum.

The operating principles behind laser printers are fairly simple. In fact, Brother machines more closely resemble large copiers than conventional laser printers, this is why they are so reliable.

There are a couple of things to look at:

On the drum unit: is the imaging drum worn or scratched? When did you last clean the corona wire?

If the drum is scratched or otherwise with defect it should be replaced. If the corona wire is dirty it can fail to properly charge the drum and lead to print defects.

On the toner cartridge: Does the toner roller have any noticeable lines or banding in the toner?

Behind the toner roller is a "Doctor Blade" that ensures an even and consistent coating of toner. If there are lines in it they can produce print defects as well. Lines would be likely caused by toner accumulation on that blade. If there are lines, are you are careful, you may be able to clean the blade by gently and slowly scrubbing the non adhesive end of a post-it note between the toner roller and the doctor blade where the lines are.

Press the blue "Go" button 3 times (within two seconds). The unit will print a "Print Settings" page with everything from serial number to a replacement toner count. Page count is first item, left column, below the drum life bar graph.

You need to replace the magenta drum. Just because there is life left; it's possible it is scratched. Also, take a cotton ball dip in alcohol and wipe the LED's off when the cover is open; those black things that are hanging down from the cover. Also, make sure your drums are installed in the proper spots (magenta in magenta slot). If the toner "rubs off" after it prints... then the fuser is defective.

The drum is a very sensitive part. Should not touch with bare hand, expose to light for long, etc. With what did you clean,it.

Have you tried cleaning the corona wire on the drum unit (the blue slider bit)?

Replace the drum unit (assuming you have already replaced the toner cart?)

To check the remaining drum life press the go button 3 times. A report should print out with the info on. Even though you may have some remaining life, the drum can fail early.

If the dots/marks are repeating about 3 times down the page it is almost certainly the drum unit that has the problem.

your laser printer
1) print color quality is now distorted that means print skew (technician called)
2) print tint means the print color not enough density,
3) print mottle means print dirty
you may try
1) print distorted--- find out the skew adjustment from your printer manu, it is adjust the image before transfer to the drum.
2) print skew could be happened when the drum replace install not very accurate, so install it more carefully.
3) print tint---you may increase print density from the manu, not fix,
4) print tint---the toner caridge near life cycle or using the less compatible toner. so you have change the quality toner or cartridge (if near life cycle) to improve quality photo print
5）print mottle---toner quality ? or cartridge near life cycle also cause print dirty paper,