Leaking toner toner is spilling out and collecting in the paper feed tray and on the table the printer is sitting on. Have removed drum and replaced toner with Sharp cartridge. Any clues? Thanks in advance Steve

See below. It's the steps after 7 that is most likely part of you issue. Refer to your user guide (or see below for a link to an online version) for illustrations.


1. Slowly take out the drum unit and toner cartridge assembly. Some of the jammed paper will be pulled out with the drum unit and toner cartridge assembly.
2. Set the drum unit and toner cartridge assembly on a piece of disposable paper or cloth in case you accidentally spill or scatter toner.
3. To prevent damage to the printer caused by static electricity, DO NOT touch the electrodes inside the printer.
4. Close the front cover.
   Note: Do not put the drum unit and toner cartridge assembly back in at this point.
5. Pull the paper tray completely out of the printer.
6. Pull the jammed paper down and out of the printer.
7. Open the back cover (back output tray).
8. Still looking at the back of the printer, pull the tab toward you to open the fuser cover.
9. Pull the jammed paper out of the fuser unit.
   HOT SURFACE
   After you have just used the printer, some internal parts of the printer will be extremely hot. Wait for the printer to cool down before you touch the internal parts of the printer.
10. Close the back cover (back output tray).
11. On the drum unit you set aside, push down the green lock lever and take the toner cartridge out of the drum unit. Clear the jammed paper if there is any inside the drum unit.
    CAUTION
    Handle the toner cartridge carefully. If toner scatters on your hands or clothes, wipe or wash it off with cold water at once.
    
    To avoid print quality problems, DO NOT touch the roller part of the toner. Try to keep you hands, fingers and everything else away from there.
12. Put the toner cartridge back into the drum unit until you hear it lock into place. If you put the cartridge in properly, the green lock lever will lift automatically.
13. Open the front cover. Put the drum unit and toner cartridge assembly back in the printer.
14. Put the paper tray firmly back in the printer.
15. Close the front cover.
16. Make sure that the Error LED is now off.
    

http://www.brother-usa.com/ModelDocuments/Consumer/Users%20Manual/UM_HL_2140_2170W_EN_1160.PDF

most likely the OPC (drum) or sometimes called "image drum or transfer belt located in the top draw. this is a consumable that needs replacing after it's life cycle is over. sometimes it will go below or over the life cycle, it all depends on many variables.

I would take out all the consumables, toner, belt and so on and use a dry cloth and small vacuum to clean the inside of the printer, then test it again, but when you have streaks it is usually the transfer belt. other possibilities is the scanner/laser window inside, sometimes it gets toner on the glass.

but step 1 is the Transfer Belt/Drum

hope this helps

Brother strongly recommends that customers do not use generic drum unitsand/or toner cartridges, or refill their Brother toner cartridge. Each Brother laser printer is designed to work at pre-set temperatures that are matched exactly to each of our individual toner formulations. Each individual component is designed to work with the other to ensure quality and reliability. Using non-Brother supplies may affect the Verify the message displayed on the LCD.

Warning: If you just used the machine some parts inside the machine are extremely hot.

1. Pull the paper tray completely out of the machine.

2. Pull the jammed paper out of the paper tray opening. If you are unable to remove the jammed paper continue to STEP 3. If you are able toremove the jammed paper continue to STEP 9.

3. Open the front cover. If you cannot open the front cover, do not useextra force. See below for further assistance.

4. Pull out the drum unit and toner cartridge assembly. The jammed papermay be pulled out with the toner cartridge and drum unit assembly, or removing the drum and toner assembly may release the paper so you canpull it out of the paper tray opening.

a. If you are able to remove the drum assembly and jammed paper continueto STEP 5.

b. If you cannot remove the drum unit and toner cartridge assembly easily, do not use extra force. See below for further assistance.

5. Place the drum unit on a drop cloth or large piece of disposable paper to avoid spilling and scattering the toner. Hold down the blue lock lever on the left side of the drum assembly and lift the toner out of the drum unit. Examine the drum carefully for small pieces of paper that may be jammed inside.

6. Reinsert the toner cartridge in the drum unit until it clicks into place. If you put it in properly, the lock lever will lift automatically.

7. Place the drum unit and toner cartridge back into the machine. Use equal pressure on both sides of the drum unit when pushing it back into place. Make sure it clicks into place.

8. Close the front cover. Make sure it clicks into place.

9. Remove any remaining paper in the paper tray and then reload it. The tray can hold up to 250 sheets of 20lb paper. Do not over fill the tray.There is a maximum paper mark located on the top of the right and left paper guide. It looks like a V cut out in the plastic. Fan the stack of paper well to avoid paper jams or misfeeds.

NOTE: If you are using special paper and the machine has problems feeding it from the paper tray, try the paper again using the manual feed slot

10. Put the paper tray firmly back into the machine and unfold the output paper tray support flap before using the machine.

11. Turn the Brother machine around with the back of the machine facing you.

12. Open the back cover.

13. The black plastic inner chute should spring open automatically when the back cover is opened. Note: The inner chute has a diagram on it of a piece of paper being removed from the unit.

14. If there is paper inside the machine carefully remove it.

15. Close the back cover. NOTE: The inner chute will close automaticallywhen the back door is closed.

16. To test, print the Help List:

a. Press the REPORTS key located on the right side of the control panel.

b. Press the up or down arrow key until Help list appears on the display(#2).

c. Press Menu/Set. The report should begin printing.

Thanks an good luck

If both of the printers have seperate toner and drum cartridges, then it is probably a feed roller issue ( one side is pulling the paper more than the other, causing a curved line ). One trick to try would be to print a page, and pull the power cord halfway through the print. Open the printer and remove the paper and drum and toner and look on the drum. If the latent text is curved on the drum, Then replace both. It is odd that you have two printers that are having the same issue though, especially if you have two drum and toner units. Also, check to make sure that the paper is seated properly in the paper tray, if there is too much play around the paper, the printer may not feed the paper properly. With physical access to the printers, a tech should be able to figure out the problem fairly quickly.

Paper light blinking could mean a few things on this machine.

There could be a paper jam in the machine. Open the front cover remove the drum and toner and look in the machine. You can also check in between the drum and toner by removing the toner from the drum. Open the back cover and look for a Jam as well.

Try putting a piece of paper in the manual feed tray which is right above the paper tray, sometimes on certain documents the margins are too big and asks to go into the manual feed slot.

Paper light flashing could mean several things on this machine.

There could be a paper jam in the machine. Open the front cover remove the drum and toner and look in the machine. You can also check in between the drum and toner by removing the toner from the drum. Open the back cover and look for a Jam as well.

Try putting a piece of paper in the manual feed tray which is right above the paper tray, sometimes on certain documents the margins are too big and asks to go into the manual feed slot.

dots are usually always caused by the drum..drums are very easy to replace..(you don't even need a screwdriver)
here's how..
remove the unit that the toner sits into..it's called a process unit..comes out as a whole with the toners...
next open left cover..
remove waste toner bottle. (drum sits right above it!!!
next remove drum by pushing on grey button and pulling drum
out the left side of the printer.

as far as the jam message you might need to replace tray feed tires located up under the machine

Clear the jammed paper as follows.
Observe Cautions signs in printer.
Always remove all paper from the paper tray and straighten the stack when you add new paper. This helps prevent multiple sheets of paper from feeding through the printer at one time and prevents paper jams.
1. Press the cover release button and then open the front cover.
2. Slowly take out the drum unit and toner cartridge assembly. The jammed paper will be pulled out with the drum unit and toner cartridge assembly.
3. Pull the paper tray completely out of the printer.
4. Close the front cover.
5. Pull the jammed paper up and out of the printer.
6. Open the front cover again.
7. Open the back cover.
8. Pull the tabs at the left and right hand sides toward you to open the fuser cover (1).
9. Using both hands, gently pull the jammed paper out of the fuser unit.
10. Close the back cover.
11. Pull the duplex tray completely out of the printer.
12. Pull the the jammed paper out of the printer or the duplex tray. Put the duplex tray back in the printer.
13. Push down the blue lock lever and take the toner cartridge out of the drum unit. Clear the jammed paper if there is any inside the drum unit.
14. Put the toner cartridge back into the drum unit until you hear it lock into place. If you put the cartridge in properly, the blue lock lever will lift automatically.
15. Put the drum unit and toner cartridge assembly back in the printer.
16. Put the paper tray firmly back in the printer.
17. Close the front cover.
18. Make sure that the Paper LED is now off and the printer is ready.
After clearing paper jam if noise persist printer may need a Repair Tech and parts replacement for broken or wore parts.

It sounds to me like your pickup rollers are worn. You should order a new set and replace them. That should solve your paper jam issue.