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In the Brother HL-2140 printer, it shows the Toner led light is on. Even if there is plenty of toner on the cartridge. It just wont print anything after initiating a print job since the toner light is on.Here is a trick on what you need to do:
1. Turn off the Brother HL-2140 printer. 2. Open the front access door to take out the toner from the carriage. 3. Notice that on both sides of the toner, you will see a small hole which is most probably the sensor. 4. What you do is to cover the sensor holes with masking tape and color the tape with black marker. Or, you can also use an electrical tape to cover them. 5. Shake the toner so that the ink inside will redistribute evenly. 6. Return the toner to the carriage and try to initiate a print again.
636 is a lot of pages and depends on the toner coverage you may need to replace the toner.. 80 - 75% (is that used is remaining ??) any way check your waste toner basket first (see you manual for instructions) chances are its filled and needs cleaning or replacing (see your manual for instructions) If its fine then change your toner .. If you have the demo toner (toner shipped with machine) these contain less toner than a new cartridge and will finish faster ...
For a possible fix to the Brother HL-2140 squeal/squeak/noise problem open the printer at the other side from the paper tray and toner cartridge door. You should see a little black roller rod along with some white wheels.
The noise may be coming from the contact between the wheels/rollers which pull paper toward the output tray on top after it has been printed.
Check and clean/wipe the wheels and black rod, especially in the center area. Hopefully the noise will now be reduced/eliminated.
To get every bit of toner powder out of the cartridge, first remove the
toner unit from the drum assembly. Second, find the little circular
window on the right-side of the toner cartridge. Third, place a piece
of black electrical tape over the clear window, cannot be clear tape.
Fourth, re-install the toner cartridge into the drum assembly. Last,
put the complete unit back into your printer. This worked for me.