Question about Brother MFC-7420 Printer

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Prints beautifully from a scanned copy, but light when copying

I have the Brother MFC-7420 Printer and I know that I am not low on toner because I can print off an email or a scanned copy without any problems, it's just that when I try to copy any document, it comes out super light even when I put it on the highest resolution. I have set all my copy options to photo quality to get the best out of them, but to no avail. Please help!

Thank You!

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  • 133 Answers

Check your copy option,constrast to high and quility to Auto.
after that should be fine.

Posted on May 22, 2009

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How do you remove the toner cartridge from brothers model mfc-7420?


I would suggest downloading a copy of the user manual for your printer -it gives step-by-step instructions as well as detailed pictures to follow to remove the toner cartridge from the drum


Here is the link for the user manual for the Brother MFC-7420 All-In-One Laser Printer: 

http://welcome.solutions.brother.com/BSC/public/files/dlf/doc000387/ALLFB_UsaEngUsr_B.pdf

This is a .pdf file-You will need Adobe Reader to read the manual.

Once you have downloaded a copy of the manual to your pc, Go to Section 11-25 (p. 112) and 11-26 (p. 113)  Here you will find detailed step-by-step instructions and illustrations on how to remove the toner cartridge from the drum.

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The manual doesn't say it will do double sided copies. it will copy two pages to one sheet of paper or 4 pages to one sheet of paper. you will probably have to make a copy of the document and then reload the paper back into the tray. experiment with it like put it in face down or face up then which is the top of the page. you can use a marker on a blank sheet of paper to see how it prints out.
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First guess is you have a bit of dirt (often white-out from people scanning corrected paper that's not quite dry) stuck on the fax scan window. This should be described pretty well in your user manual (which you can download online from brother.com).

Its also possible that there is dirt (typically loose toner) on the laser scan window (there's a laser that shines through it to get the image pattern on the drum). That window is often along the bottom of the unit under the drum/cartridge (take the cartridge out and look). The Brother manual I've seen seems to ignore this possibility.

Print streaks DO NOT mean cartridge drum replacement in many cases !! On brother Intellifax or MFC or other laser copier/printer/fax, keep in mind that either the fax/copy scan window OR the laser scan window can get dirty. If the fax scan window is dirty, you see streaks on outgoing faxes and copies (but NOT incoming faxes). If the laser scan window is dirty, you see streaks on all prints (copies, faxes, print-from-computer).

Note also that when transporting/moving some laser copier with the toner cartridge inside, the toner can get out and make a big mess inside (including getting the laser scan window dirty). An air compressor can be usefull to blow it out. And sometimes using alcohol to clean is a BAD idea (maybe incompatible with plastic and rubber parts). A damp rag is probably fine.

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The MFC7420 has sensors that sense when the toner is low. It lets you know in time to purchase another cartridge before you totally run out. If you can get one same day I wouldn't purchase one until the printer pages start fading.

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The toner life end message means the toner is getting low. It will continue to print without any problem. Eventually you will see the print starting to get light in spots. If it is a new cartridge, the toner level sensors are probably dirty.

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Open te lid and look at the glass. You have dirt or white-out or something on the thin strip of glass to the left. Clean that glass!

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