Low print quality

If you have replaced multiple components in your Brother 8510 printer, including the oven unit, laser unit, high voltage board, power board, and drum unit, but are still experiencing faded images, there are a few other potential causes and solutions to consider:
1. Toner Cartridge: Ensure that you are using a genuine and compatible toner cartridge for your Brother 8510. Low-quality or incompatible toner cartridges can result in poor print quality. Try replacing the toner cartridge with a new, genuine Brother cartridge to see if it resolves the issue.
2. Toner Density Settings: Check the toner density settings in the printer's software or control panel. If the density is set too low, it can result in faded or light printouts. Increase the toner density setting to see if it improves the print quality.
3. Cleaning the Corona Wire: The corona wire is responsible for transferring the toner to the paper. If it is dirty or contaminated, it can cause faded prints. Consult your printer's manual for instructions on how to clean the corona wire properly. Be careful when handling the corona wire as it is delicate.
4. Print Settings: Check the print settings on your computer or within the printer's software. Ensure that you are using the appropriate print quality settings and that any power-saving modes are disabled. Adjusting the print settings to a higher quality mode can enhance the print quality.
5. Contact Brother Support: If you have exhausted all the troubleshooting steps and the issue persists, it may be beneficial to reach out to Brother customer support or a qualified printer technician. They can provide further guidance or arrange for a professional inspection and repair of your printer.
Remember to follow the manufacturer's guidelines and safety precautions when working with printers and their components.

my dear you clean mirror and chek toner tenk

U can enable department code for colour print, enable "no limit black", where user print colour only prompt for department code. All this can be done under User Function --> Department Management

You do not say what exact model of printer you are using so any answer will be generic rather than specific.

Poor colour and black tone can be as a result of various factors:
1. Poor paper quality that you are printing on.
2. Poor ink or toner quality being used.
3. Use of Ink / Toner saving modes or software.
4. Worn or damaged printer components such as the fuser roll on a laser printer and other similar consumables with a limited page use life.
5. Poor quality content being printed, i.e. low quality images being printed at too high a print resolution.

The Density Sensor is located inside the right upper door and senses the colour calibration pattern for each colour formed on the transfer drum during a calibration cycle. Press GO. Print a configuration page and then troubleshoot as an Image-quality problem as instructed in the user manual. Check the transfer guide for cracks and replace if necessary. Check the event log for errors numbered 54.00.0<X> the X indicates, 5-sensor abnormality, 4-Cyan, 3-Magenta, 2-Yellow, 1-Black. The last 3 error codes should be seen on the Configuration page.

First run a cleaning cycle and test print. You can get this from Control Panel - Printers - Select Printer name and right click - select Properties and then Maintenance.

Then

1. Select Normal or Best, rather than Draft, in the Paper Type/Quality option in the Page Setup Screen.
2. Align the print cartridges. Select the Calibrate panel on the HP deskjet utility screen, then click the Align button.
3. Decrease ink density or drying time.
a. Click File > Print > Paper Type/Quality.
b. Click the Ink tab.
c. Use the sliders to adjust ink density and ink dry time.

Hi, Whenever the printer is turned on it performs a head clean, this is why the coloured inks get used over time even though they are not used for printing. Unless you have selected "print in black & white only" your printer will "mix" the coloured inks with the black, also check the printer options to ensure you are not using the photographic quality as this will use inks very rapidly. You need to consider a couple of things, firstly the official line: Epson (and all other inkjet manufacturers) do this to prevent the coloured print head nozzles from getting blocked. If they are not used for a long time the ink dries up and blocks the nozzles. Epson recommends printing at least once a month with all colours to prevent this. The 2nd unofficial line is that it is a win-win situation for manufacturers. Firstly they get to cut down on costly warranty call outs for blocked heads (replacement printers, technician manhours, etc) and secondly they get to sell lots more inks (Ka-ching!). If you really want to print black text only (and save cash on price per-print) then a mono-laser printer is the best way as they can now be bought at inkjet prices.

Assuming that you are using the same paper and have not changed any of the consumables you should do the following:

1. Clean LED head with lens cleaner or soft tissue.

1. Remove the toner cartridge and give it a few shakes then reinstall it.
2. The Toner Could be low so Change toner cartridge.

4. Make sure that the paper is not damp as this will cause fading and poor quality printing and images.

1. The image drum may have been light contaminated so remove it from the printer and store it in a totally dark place for several hours then reinstall it.
2. If the image drum is dirty then wipe it very gently with soft tissues, being careful not to scratch it.
3. Open the top cover and check to be sure that each toner cartridge is fully seated and that each toner cartridge lock lever is pushed all the way back.
4. Press the top cover release latch and open, then close, the cover.
5. Check MEDIA MENU – TRAY1 MEDIA TYPE and set as required. Do the same for TRAY2 and MPT.
6. Check MEDIA MENU – TRAY1 MEDIA WEIGHT and set as required. Do the same for TRAY2 and MPT.
7. Possibly set the value of media weight in the menu to the next heaviest one.
8. Check PRINT MENU – RESOLUTION setting and set to 600 x 1200DPI
9. Check PRINT MENU – TONER SAVE MODE and make sure this is OFF
10. Check PRINT MENU – MONO PRINT SPEED and make sure this is set to MIXED SPEED
11. Check the COLOUR MENU – DENSITY CONTROL and set this to AUTO
12. Check the COLOUR MENU – AUTO DENSITY and set this to EXECUTE
13. Check the COLOUR MENU – CMY 100% DENSITY is set to ENABLE if you want a glossier black finish.

If you are sure the diagnostics show the colours correctly, one thing I would look at is to see if it had a colour profile set up for it.Don't know whether this printer normally has, if it has not I would suggest reinstalling the driver. To check - Start/Printers & Faxes/ Rt click on printer then properties, look under Colour management tab. Pete