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Run a PQ test. On the control panel, go to diagnostics and then find the PQ test. This will print a quality test that will reveal if you have a bad cartridge, which is the most likely cause of magenta streaks.
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
Each color has its own laser. Use the cleaning wand in the front door to clean the lens covers for each color. You will need to remove the waste toner cartridge in front of the the slots to do this. If that does not cure the problem, you will need to replace the developer housings for the colors that are streaking.
The manual can be downloaded at: www.lpscomputer.com/ec/Phaser_7700_Service_Manual.pdf
I've refilled the toner cartridges a few times now and never had a problem with vertical streaks until recently. I refilled both the cyan and magenta and when I ran the test page I had dark vertical streaks on both sides. I fiddled around cleaning things, running cleaning paper through, changing reset resistors but to no avail so eventually decided to buy a replacement refurbished cyan cartridge since the streaks looked mainly blue and bingo... well almost now I just have very light magenta streaks. The issue is obvious when I compared the old and new cartridge, the replacement toner is a much duller cyan and is of the wrong consistency since once it's been in the printer everything gets covered in it which is why I think it causes the banding to occur. I'm just trying to work out now whether to try refilling the magenta again (v. messy) or just go for another refurbished cartridge (£34).
Streaks can be caused by a number of things The fuser The ETB The toner cartridge The firmware The printer needs a cleaning. The slot in the printer. Incorrect Media.
Try cleaning the printer, use a lint-free cloth for the ETB, DO NOT touch the belt with your fingers, the oil from fingers will often make things worse. Always use a lint-free cloth, if you ever encounter dirt inside the printer, dampen the cloth.
Calibrate the printer. From the printer's control panel menu Configure Device-> Print Quality-> Calibrate now. (Press the Checkmark key to advance through menus)