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Depending on the model of machine.
Either on the Menu on the printer find Ink Management or press the Ink Management button.
Print a Test Page
If no Magenta Dots showing then proceed to Cleaning and Clean the print-heads through the proceedures given on the machine.
Print another test page. If Magenta Dots are fine then cleaning done. if not then try cleaning again.
If still not fine then the machine will need to be cleaned professionally which will cost a reasonable amount. Most service fees are more that it is to replace the printer.
Take the toner cartridge out and try to turn the Developer roller ( the toner coated roller), if it doesn't turn you have a faulty cartridge. If the cartridge is OK, recheck the Magenta drum to see if the thin corona wire has been broken. You will need to remove the Cyan toners to get to the corona wire cover. If is damaged or broken, the whole drum will have to be replaced.
It looks like the magenta print head nozzels are blocked.
Inkjet printers need to be used frequently to prevent inkdrying out in the print head nozzles. If the print head cleaning maintenance routine does not clear the blockages,then print head needs replacing, but it may be expensive. It may be more cost effective to buy a later model and better printer thanreplace the print head.
Well, this is a common problem with people who purchase Brother printers, but do not always use Brother Ink Cartridges. Brother has a cleaning agent in the print cartridge and the compatibles do not.
"If you have a lack of one (or more) color do the following:
sure all carts are full, placed well and are secured. Insert a new
ORIGINAL BROTHER CART for the one that shows no color.
then start bk-copy then four times arrow up quick after another. machine
will switch into maintenance mode and all lights will flash. Press 7
then 6 then 4 then start bk-copy. machine will initialize the carts and
refresh ink within tubes and print head. After that it does some power
cleaning. When finished press 7 then 6 then 3 then start bk-copy.
machine will run a power purge. when finished press 9 then 9 to leave
the maintenance mode. do run a quality test print.
This should clean the lines out and clear up your issue.
print out is mostly due to cartridge related issues. In this case it seems that magenta is the issue. Take out the
cartridge and clean its drum/ (green roller) with a dry, soft,
lint-free cloth. The drum is located under a cover. Checkout for
any spilled toner inside the printer and clean it also. Print a few
pages so that the parts get further cleaned. I think, this would solve
(thicker lines) and dots etc indicate faulty PCR Roller which is located just
green drum inside the cartridge. Try cleaning it or replacing the Magenta Cartridge. If required, get
the PCR Roller changed by a professional.
Let me know if any
further clarification is required. Hope it helps! Good Luck! CreativeTECH
Colored vertical streaks - looks like a transfer belt problem, and it's not user fixable. You may need a new belt unit - you can find it for around US$ 80-120, but you may want to have a technician inspect the unit first, since it could arguably be the drum instead, and you don't want to fork around US$ 100 and replace the wrong part. You can try showing a printer sample at a print shop; by looking at the streaks it is possible to diagnose drum, fuser or belt problems. Here you find a much more detailed page, for another printer model, but the issues are mainly the same for most color printers: http://www.laserquipt.com/support/idx/26/452/article/Toner-Smearing-Issues.html
Again, this was actually HP Laserjet 3800. Problem solved by chatting with HP, and them having me go into a diagnosis mode that disabled cartridge check. Then, I removed the cyan cartridge, the dots went away. They then had me put the black into the cyan slot, and not dots appeared. I had backup toner on hand, swapped in a new cyan and magenta, and all was good. HP agreed to replace the cartridges.
do this procedure 1.print test page then stop the printer on the middle print proses by turn the printer of or open the rear cover 2.remove the paper jam carefully 3.look to the paper if the problem found change the drum unit els the fusser unit cause the problem