Why are we getting persistent code 075?

enter the maintenance mode of 05 then 2000 and start

your drum cartridge should have a little rod that you can carefully pull out and in. This cleans a wire that charges your drum

Make sure that the toner ink cartridge is a genuine Lexmark toner cartridge. Try removing the toner cartridge and then shake the toner sideways. Re-seat the toner cartridges and check if the error persists. If it does, please contact our Technical Support Hotline.

Turn the printer off and on to see if it can automatically clear some or all of the jam. Many printers provide an error-code listing on the front panel display for the area where the jam occurred. If your printer shows an error code, be sure and check the printer manual to see if that identifies the area of the printer where the jam occurred.
Turn off the printer.
Remove any paper trays. Inspect them for wrinkled or damaged paper.
Open any other doors that give access to the printer's paper path and to the toner or ink cartridge.
If necessary, remove the toner or ink cartridge. Place it in a bag or away from light to avoid damaging it.
If you find a piece of jammed paper, remove it by holding it with both hands and pulling firmly (see A). The goal is to keep the paper from tearing. If several pieces are jammed together, try pulling out the middle piece first to loosen the jam.
If the paper does tear, try rotating the roller gears manually to free the paper (see B). Don't force anything, though.
Replace the toner or ink cartridge and paper trays, close any doors you opened and turn the printer back on.
If the printer paper jam message still appears, then there is still some paper in the printer. Reinspect the paper path.
If you get toner or ink on your clothing, wipe it off with a dry cloth and then launder the clothing in cold water.
Watch out for loose toner or ink on jammed paper, and do your best to avoid spilling it on yourself or the printer. If a little bit of loose toner or ink gets in the printer, though, it should clear after a few sheets are printed.
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paper keeps jaming - Brother MFC-3240C All-In-One InkJet Printer

Hi there,

This problem is often caused by spilled toner. Open the printer, carefully remove the cartridge, and give it a few bursts of compressed air. Often running several pages or type through will also fix this. If it persists, replace the toner cartridge.

Hope this initial info/idea helps. Let me know for any clarifications.

there is no special toner, check the connector that connect the magnetic roller to the charger and try another bottle of toner if the problem persist change the cartridge

1. Turn the printer off and on to see if it can automatically clear some or all of the jam. Many printers provide an error-code listing on the front panel display for the area where the jam occurred. If your printer shows an error code, be sure and check the printer manual to see if that identifies the area of the printer where the jam occurred.
   
2. Step 2 Turn off the printer.
   
3. Step 3 Remove any paper trays. Inspect them for wrinkled or damaged paper.
   
4. Step 4 Open any other doors that give access to the printer's paper path and to the toner or ink cartridge.
   
5. Step 5 If necessary, remove the toner or ink cartridge. Place it in a bag or away from light to avoid damaging it.
   
6. Step 6 If you find a piece of jammed paper, remove it by holding it with both hands and pulling firmly (see A). The goal is to keep the paper from tearing. If several pieces are jammed together, try pulling out the middle piece first to loosen the jam.
   
7. Step 7 If the paper does tear, try rotating the roller gears manually to free the paper (see B). Don't force anything, though.
   
8. Step 8 Replace the toner or ink cartridge and paper trays, close any doors you opened and turn the printer back on.
   
9. Step 9 If the printer paper jam message still appears, then there is still some paper in the printer. Reinspect the paper path.
   

Step1
Turn the printer off and on to see if it can automatically clear some or all of the jam. Many printers provide an error-code listing on the front panel display for the area where the jam occurred. If your printer shows an error code, be sure and check the printer manual to see if that identifies the area of the printer where the jam occurred. 
Step
2
Turn off the printer. 
Step
3
Remove any paper trays. Inspect them for wrinkled or damaged paper. 
Step
4
Open any other doors that give access to the printer's paper path and to the toner or ink cartridge. 
Step
5
If necessary, remove the toner or ink cartridge. Place it in a bag or away from light to avoid damaging it. 
Step
6
If you find a piece of jammed paper, remove it by holding it with both hands and pulling firmly (see A). The goal is to keep the paper from tearing. If several pieces are jammed together, try pulling out the middle piece first to loosen the jam. 
Step
7
If the paper does tear, try rotating the roller gears manually to free the paper (see B). Don't force anything, though. 
Step
8
Replace the toner or ink cartridge and paper trays, close any doors you opened and turn the printer back on. 
Step
9
If the printer paper jam message still appears, then there is still some paper in the printer. Reinspect the paper path.

Step1
Turn the printer off and on to see if it can automatically clear some or all of the jam. Many printers provide an error-code listing on the front panel display for the area where the jam occurred. If your printer shows an error code, be sure and check the printer manual to see if that identifies the area of the printer where the jam occurred. 
Step
2
Turn off the printer. 
Step
3
Remove any paper trays. Inspect them for wrinkled or damaged paper. 
Step
4
Open any other doors that give access to the printer's paper path and to the toner or ink cartridge. 
Step
5
If necessary, remove the toner or ink cartridge. Place it in a bag or away from light to avoid damaging it. 
Step
6
If you find a piece of jammed paper, remove it by holding it with both hands and pulling firmly (see A). The goal is to keep the paper from tearing. If several pieces are jammed together, try pulling out the middle piece first to loosen the jam. 
Step
7
If the paper does tear, try rotating the roller gears manually to free the paper (see B). Don't force anything, though. 
Step
8
Replace the toner or ink cartridge and paper trays, close any doors you opened and turn the printer back on. 
Step
9
If the printer paper jam message still appears, then there is still some paper in the printer. Reinspect the paper path.