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Re: Brother MFC 4800 print quality problem
I would try cleaning the drum unit.
Take the drum unit out of the printer.
They recommend that you place the drum unit on a drop cloth or large piece of disposable paper to avoid spilling and scattering toner.
1. Carefully turn the drum unit upside down.
2. Clean the primary corona wire inside the drum unit by gently sliding the tad from right to left several times. (Be careful with the corona wire they are delicate.)
3. Return the tab to the Home position before reinstalling the drum unit. (If you do not position the tab at the home position, printed pages may have vertical lines.)
4. Re-install the drum unit.
5. Close the top cover.
6. Plug in the power cord.
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Try cleaning the corona wire on each toner cartridge. This may help solve your solution. If this does not help try another thing. Try and replace the toner cartridge. Maybe your toner cartridge needs to be replaced. Usualy when printed images are light or pale a toner cartridge replacement is recommended. To see how to replace your toner cartridges check here
Hello,This issue may becaused by poor connection. Check to see if all interface connection cables arein the printer. If the printer doesn't establish good connection with thecomputer print quality will decrease.Second thing you can check are thesettings on the computer. Are they matching with settings in Brother MFC-9840CWD.This is issue is not caused from the toner cartridge or drum unit.
Replace the drum. The drum is failing. When you replace the drum open the front door of the machine where thr drum and toner is. Hit the clear/back button. Press 1 That resets the drum count after you replaced the unit.
The drum is where the image is applied before being transfer to the paper. If the drum is wearing down the image will become poor. Changing the drum unit will make the image like new. So, yes you can run the drum catridge until you get a poor print out.
I have seen the Toner cartridge in these cause this and also thought it was drum but new toner actually fixes it, have you installed new gen toner as well as drum? Make sure you tell machine you have fitted new drum too,