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BROTHER® HL-6180 SERIES TN720 • 750 • 780 TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS BROTHER TN720 • 750 • 780 TONER CARTRIDGE 2013 UniNet Imaging Inc. All trademark names and artwork are property of their respective owners. Product brand names mentioned are intended to show compatibility only.
UniNet Imaging does not warrant downloaded information. Unauthorized sale, reproduction or distribution of this article is prohibited. For additional support, please contact techsupport@uninetimaging.com



BROTHER® HL-6180 SERIES TN720 • 750 • 780 TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS REMANUFACTURING THE BROTHER HL-6180 SERIES TONER CARTRIDGE - TN720/750/780 By Mike Josiah and the Technical Staff at UniNet Released in August 2012, the Brother HL-6180 printer engine is based on a new 40-42-ppm, 1200-DPI laser engine.
These machines have a first page out in less than 8.5 seconds, and come standard with 64Mb of memory depending onthe machine. The HL-6180 series also have duplexing built in. Our HL-6180 machine came with a TN720 starter cartridge,which is rated for 3,000 pages. The starter cartridge does not come with any reset gears.
There are three different toner cartridges available for these machines. The TN720 is rated for 3,000 pages, The TN750 is ratedfor 8,000 pages and the TN780 is rated for 12,000 pages. The TN780 will only fit into the HL-6180 and MFC-8950 machines.
There are different part numbers for these cartridges depending on your region. They are as follows: North/South America Asia/Middle East/Africa Figure shows how the toner and drum cartridges are shipped in a new machine.
2013 UniNet Imaging Inc. All trademark names and artwork are property of their respective owners. Product brand names mentioned are intended to show compatibility only.
UniNet Imaging does not warrant downloaded information. Unauthorized sale, reproduction or distribution of this article is prohibited. For additional support, please contact techsupport@uninetimaging.com






BROTHER® HL-6180 SERIES TN720 • 750 • 780 TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS Figures show a starter cartridge top, bottom and gear end cap.
Figures show the same for a TN750.
Figures show a TN780.
2013 UniNet Imaging Inc. All trademark names and artwork are property of their respective owners. Product brand names mentioned are intended to show compatibility only.
UniNet Imaging does not warrant downloaded information. Unauthorized sale, reproduction or distribution of this article is prohibited. For additional support, please contact techsupport@uninetimaging.com BROTHER® HL-6180 SERIES TN720 • 750 • 780 TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS CURRENT MACHINES RELEASED SO FAR FOR THIS SERIESHL-5440D There is a reset gear that resets the printer each time a new toner cartridge is installed. In our machine, the starter cartridgewas a TN720 and did NOT have a reset gear installed. The TN750 and the TN780 cartridges use different reset gears.
The TN750 gears, in addition to being a different color from the TN780, have one large white flag instead of two smaller gray flagson the TN780. That is how the machine knows if there is a high yield or super high yield cartridge installed. New high yield andsuper high yield reset gears are available so that starter cartridges can be made into high yield or a super high yield cartridge.
The OEM super high yield cartridge is slightly larger than the standard or high yield cartridges, but we feel at this point that thereis enough room to make them super high yield (as of April 2013, this is still preliminary info).
Reset gears serve two purposes. First they reset the printer so it knows a new toner cartridge was installed. Secondly they tell theprinter which cartridge was installed. When the printer senses a new toner cartridge, the bias voltage is set to a high voltage.
As the cartridge is used, the bias voltage is reduced gradually down. This process is necessary because according to Brother,a new toner cartridge has a tendency to print light. As the cartridge is used, the density increases. To keep the density level eventhroughout its life, the density bias voltage is reduced accordingly. Each time a new cartridge is installed, the bias voltage is resetto the high voltage point, and the cartridge page count is reset to zero. Since different yields would dictate different decreases indensity over time, Brother uses different reset gears, which tell the printer how fast to reduce the bias voltage.
NOTE: There have again been some major changes in the way the toner cartridge AND the drum cartridge works in this series.
Because of this we are covering the theory again… NEW BROTHER PRINT THEORYAs with previous Brother cartridges, the waste toner is repelled off of the drum to be transferred to the toner unit, but the methodof how this works is now very different.
Figure shown is a general layout of the component locations.
2013 UniNet Imaging Inc. All trademark names and artwork are property of their respective owners. Product brand names mentioned are intended to show compatibility only.
UniNet Imaging does not warrant downloaded information. Unauthorized sale, reproduction or distribution of this article is prohibited. For additional support, please contact techsupport@uninetimaging.com BROTHER® HL-6180 SERIES TN720 • 750 • 780 TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS The waste toner still is transferred to the supply chamber, and this remaining toner still MUST be completely removed from thesupply chamber before adding new toner. Failure to do this will cause backgrounding. In addition to contaminating thetoner cartridge, this may also contaminate the cleaning section of the drum cartridge, which in turn will contaminate the tonercartridge again. The reasons for this are explained in the following cartridge theory section.
The first new item in this engine is there is now a paper-cleaning roller in the printer itself. This roller cleans off any extra paperdust before the printing process even starts. It is located just after the paper feed rollers.
The cleaning section of the drum cartridge no longer consists of a "cleaning brush" it is now a paired system of the cleaning rollerassembly and the transfer roller but these rollers only play a minor part. The developer roller now has two jobs. In addition totransferring the good toner to the OPC for printing, it also now cleans off the majority of the waste toner off the drum. This is doneby a very complicated series of different electrical charges and a series of directional changes on the drum and developer rollers.
The developer roller and drum change direction and charge four times per full drum rotation. This is such a complicated processthat the printers actually have a rotation controller PCB with a microcomputer on it to control it all. The cleaning roller cleans off any remaining toner that the developer roller did not remove. The transfer roller basically self cleansitself of any residual toner or paper dust that might have accumulated in the printing process When the drum is cleaned by the transfer roller the surface potential of the drum is dropped (from 900V to about 200V) at thispoint the transfer roller and cleaning roller will release the waste toner to the drum. This waste toner is actually then charged bythe corona wire so that the developer roller can pick it up and bring it back into the toner hopper. Both rollers release the wastetoner at the same time. This was done to keep the print speed high, the power supply smaller and the cost on the two rollers andcartridges down.
The drum unit also now has a small waste chamber next to the cleaning roller. The reason for this waste area is for things likepaper dust that do not transfer well. Since there is a paper-cleaning roller before the cartridges in the printer this area in theoryshould stay fairly empty. The metal roller next to the cleaning roller helps keep the cleaning roller free of anything that doesnot transfer.
Since the developer roller now does most of the cleaning work, the condition of the roller while always important, is now muchmore so. If the roller has any contamination on it from the toner additives, (OEM or aftermarket) it will interfere with the cleaningcycle and ghosting/backgrounding will result. If the cleaning roller gets contaminated and not cleaned properly the same thingwill result. The main culprit for this used to be the charge felt. It is now the developer roller. It is very important that thedeveloper roller be cleaned with a dedicated developer roller cleaner. Never use alcohol of any type, as this will strip theconductive coating off the roller.
Since the waste toner is transferred back into the supply of the toner cartridge. Once you print with a bad toner cartridge,the drum unit will become contaminated. Even when you change out the toner with a good properly recycled or newOEM cartridge, the drum unit will transfer some of the bad toner back into the good toner cartridge, which will againcause backgrounding. Both cartridges will be contaminated again. It can be a vicious circle.
The remaining "toner" in the toner cartridge when toner low is reached is just below the bare minimum that can maintain theproper charge level. When the change toner light comes on, the toner will not charge up to the proper level and will causethe backgrounding. As the toner cartridge reaches the end of its useful life, the printer senses the low charge level in the tonersupply and will try to keep the charge level up. This constant charging keeps an almost "empty" cartridge from backgrounding.
Once the printer cannot get the remaining toner up to the minimum charge, the change toner light comes on. The cartridge atthis point will still be printing properly. If you were to take that same cartridge out of the machine for a few days, and then put itback in the printer without doing anything to it, the cartridge will background. This will happen because the charge level that theprinter was trying so hard to keep up has dissipated out and the materials left can no longer accept a proper charge. 2013 UniNet Imaging Inc. All trademark names and artwork are property of their respective owners. Product brand names mentioned are intended to show compatibility only.
UniNet Imaging does not warrant downloaded information. Unauthorized sale, reproduction or distribution of this article is prohibited. For additional support, please contact techsupport@uninetimaging.com BROTHER® HL-6180 SERIES TN720 • 750 • 780 TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS WHAT DOES THIS ALL MEAN?1. Make sure that your cartridge technicians thoroughly clean out the supply chamber of the toner cartridge.
2. Clean the developer roller with an approved developer roller cleaner, NOT alcohol! That will strip the conductive coating off.
3. In the event that they forget, and you have a backgrounding cartridge. The toner must be completely cleaned out again (do notuse the toner over!), and NEW fresh toner MUST be installed.
4. Clean the developer roller (again) with an approved developer roller cleaner, NOT alcohol! 5. The drum unit then has to be taken apart and cleaned out with emphasis on the cleaning roller and transfer roller. This is avery simple process but very necessary once it is contaminated.
According to our tests, there will be approximately 60g of toner remaining when the cartridge is spent; this is normal.
The remaining toner however, as stated above, is waste toner/paper dust only and must be thrown out or there will bebackgrounding issues.
REQUIRED TOOLS1. Toner approved vacuum2. Phillips head screwdriver3. Small common jewelers screwdriver4. Needle-nose pliers REQUIRED SUPPLIES1. Toner for use in the Brother HL-6180 series of cartridges2. Developer roller cover3. New developer roller (optional)4. Dedicated developer roller cleaner (not alcohol; see text above)5. Lint free cotton cloths6. Toner magnet cloths 7. White lithium grease 1. Vacuum the exterior of the cartridge.
3. Press in on the bottom tab and remove the end cap.
2. On the gear side, remove the two screws on the end cap.
2013 UniNet Imaging Inc. All trademark names and artwork are property of their respective owners. Product brand names mentioned are intended to show compatibility only.
UniNet Imaging does not warrant downloaded information. Unauthorized sale, reproduction or distribution of this article is prohibited. For additional support, please contact techsupport@uninetimaging.com BROTHER® HL-6180 SERIES TN720 • 750 • 780 TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS 4. Remove the gears as shown.
5. Remove the white plastic spacer from the developer roller shaft.
6. Remove the E-ring and the developer roller drive gear.
2013 UniNet Imaging Inc. All trademark names and artwork are property of their respective owners. Product brand names mentioned are intended to show compatibility only.
UniNet Imaging does not warrant downloaded information. Unauthorized sale, reproduction or distribution of this article is prohibited. For additional support, please contact techsupport@uninetimaging.com BROTHER® HL-6180 SERIES TN720 • 750 • 780 TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS 7. Remove the fill plug from the toner cartridge. Dump theremaining toner and vacuum/blow out the cartridge.
8. On the non-gear side of the developer roller remove the screw, press in on the locking tab and remove bushing plate.
2013 UniNet Imaging Inc. All trademark names and artwork are property of their respective owners. Product brand names mentioned are intended to show compatibility only.
UniNet Imaging does not warrant downloaded information. Unauthorized sale, reproduction or distribution of this article is prohibited. For additional support, please contact techsupport@uninetimaging.com BROTHER® HL-6180 SERIES TN720 • 750 • 780 TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS 9. On the gear side of the developer roller, press in on the three locking tabs and remove the white plastic bushing plate.
10. Remove the developer roller.
2013 UniNet Imaging Inc. All trademark names and artwork are property of their respective owners. Product brand names mentioned are intended to show compatibility only.
UniNet Imaging does not warrant downloaded information. Unauthorized sale, reproduction or distribution of this article is prohibited. For additional support, please contact techsupport@uninetimaging.com BROTHER® HL-6180 SERIES TN720 • 750 • 780 TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS 11. Vacuum the doctor blade and foam feed roller clean.
Until new blades are available, we do not recommend thatthe doctor blade be removed or the developer rollerfelt seals disturbed. The doctor blade can be cleaned easilyby blowing the excess toner off, and wiping it down with alint-free cloth. Be very careful not to leave any lint behind! 12. Inspect the magnetic roller felts.
If they are compressed (shiny), rough them up with a small screwdriver.
2013 UniNet Imaging Inc. All trademark names and artwork are property of their respective owners. Product brand names mentioned are intended to show compatibility only.
UniNet Imaging does not warrant downloaded information. Unauthorized sale, reproduction or distribution of this article is prohibited. For additional support, please contact techsupport@uninetimaging.com BROTHER® HL-6180 SERIES TN720 • 750 • 780 TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS 13. Clean the developer roller with a lint-free cloth and adedicated developer roller cleaner. Do not use any chemicalsother than a dedicated developer roller cleaner to clean theroller. Any type of alcohol cleaner will strip the conductivecoating off the roller.
14. Re-install the developer roller with the long shaft to thegear side.
15. Install the non-gear side developer roller bushing 16. Install the gear side developer roller bushing.
Make sure it snaps in place.
2013 UniNet Imaging Inc. All trademark names and artwork are property of their respective owners. Product brand names mentioned are intended to show compatibility only.
UniNet Imaging does not warrant downloaded information. Unauthorized sale, reproduction or distribution of this article is prohibited. For additional support, please contact techsupport@uninetimaging.com BROTHER® HL-6180 SERIES TN720 • 750 • 780 TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS 17. Fill the cartridge with toner for use in the Brother HL-6180 series of toner cartridges.
Replace the fill plug.
18. Clean the gears, making sure that they have no toner 20. The cartridge we are remanufacturing is a starter cartridge on them. This is a good time to also check the gear shafts to and did not come with a retaining plate, reset gear or spring.
make sure there is enough grease. If the shafts appear dry, These items need to be installed for the printer to accept a or the grease is contaminated with toner, clean the shaft starter cartridge as new. and inside of the gear. Replace the grease with whitelithium grease. 21. Install the retaining plate over the fill plug.
19. Install the developer roller gear, E-ring, white axle spacer.
2013 UniNet Imaging Inc. All trademark names and artwork are property of their respective owners. Product brand names mentioned are intended to show compatibility only.
UniNet Imaging does not warrant downloaded information. Unauthorized sale, reproduction or distribution of this article is prohibited. For additional support, please contact techsupport@uninetimaging.com BROTHER® HL-6180 SERIES TN720 • 750 • 780 TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS 22. Install all the gears as shown.
23. Depending on the cartridge you have, set the reset gearsas shown. Make sure the reset-gear tab and the tab on theretaining ring are next to each other.
2013 UniNet Imaging Inc. All trademark names and artwork are property of their respective owners. Product brand names mentioned are intended to show compatibility only.
UniNet Imaging does not warrant downloaded information. Unauthorized sale, reproduction or distribution of this article is prohibited. For additional support, please contact techsupport@uninetimaging.com BROTHER® HL-6180 SERIES TN720 • 750 • 780 TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS 24. Install the gear side end cap, and two screws, 25. Wipe the cartridge down to remove any remainingtoner dust. Be careful not to touch the developer roller! 26. Install the developer roller cover.
2013 UniNet Imaging Inc. All trademark names and artwork are property of their respective owners. Product brand names mentioned are intended to show compatibility only.
UniNet Imaging does not warrant downloaded information. Unauthorized sale, reproduction or distribution of this article is prohibited. For additional support, please contact techsupport@uninetimaging.com BROTHER® HL-6180 SERIES TN720 • 750 • 780 TONER CARTRIDGE REMANUFACTURING INSTRUCTIONS TEST PAGES1. Take the machine offline by pressing any of the arrows, "OK" or "Back" buttons.
2. Press the up or down arrows until you see "Machine Info."3. Press "OK" or "Go."4. Press the up or down arrows until you see either "Demo Print" or "Test Page."5. Press "OK" or "Go."6. The page selected will print.
2013 UniNet Imaging Inc. All trademark names and artwork are property of their respective owners. Product brand names mentioned are intended to show compatibility only.
UniNet Imaging does not warrant downloaded information. Unauthorized sale, reproduction or distribution of this article is prohibited. For additional support, please contact techsupport@uninetimaging.com

Source: http://vistablue.cl/images/productos/Brother_HL6180_TN750_780_Toner_Reman_eng.pdf

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