Brother MFC 8640D
I just changed my drum with a genuine Brother drum and my print quality is poor. The contrast is almost non-controllable and the right and left edges, from about 1.5 inches on each side, prints very lightly. Help!

How to Identify and Fix Common printer Problems ?

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Next to Duplex / Booklet, select `Duplex` or `Duplex (Manual)`. Automatically prints on both sides of the paper. The machine prints all the even-numbered pages on one side of the paper first. Then, the printer driver instructs you (with a pop-up message) to reinsert the paper to print the odd-numbered pages.
The problem may be due to a simple issue like printer paper quality or ink/toner cartridge wear, or it could be a more serious problem that requires professional repair.
Check the toner level

The first step for light and faded prints is to check that your toner cartridge is not running low or empty. If your laser printer has a built-in LCD screen, you should be able to view the toner levels on screen or via a printed test page accessed in the settings menu.

A common cause of faded, faint printouts from your inkjet printer is dried ink particles causing a blockage in your printer. The printheads on an ink cartridge can be become blocked if the printer is not used for a period of time, so it is recommended to print a few pages each month to maintain the print quality.
What is auto duplex printing? Auto duplex printing simply means that your printer can automatically print on both sides of your paper. Many newer printers feature this function. Some older models, however, require you to manually flip the pages so they can be printed on both sides.
Your printer can become misaligned if there is any paper stuck in the machine, print cartridges are clogged or dirty, improper installation of cartridges and using low quality cartridges. Additionally, a printer can become misaligned after the machine completes a large print job.
Print on both sides of the paper (Windows)

Use HP printer software to set up a two-sided (duplex) printing job with an HP Laser printer. To avoid page ordering issues, load enough paper into the paper tray to complete your print job.

The most common cause for not cutting through is that your material isn`t perfectly flat, so the laser is out of focus as it gets closer/further away from the material.
There are a few things that could be the cause of this problem, including: Empty ink or toner cartridges that need replacing. Ink or toner cartridges that have become dislodged from their proper place. The wrong paper size loaded in the input tray.
Is duplex printing the same as double-sided? Both duplex printing and double-sided printing end up with the same result – a piece of paper with information printed on both sides. Double-sided printing is the outcome, whereas duplex printing is the technology that creates this outcome.
Printing on both sides of paper is called duplex printing. Most printers offer the option of automatically printing on both sides of a sheet of paper (automatic duplex printing). Other printers provide instructions so that you can manually reinsert pages to print the second side (manual duplex printing).
bidirectional printing

Printing in which the print head prints in both directions (bidirectionally) from left to right and then right to left. This increases the print speed but may reduce precise vertical alignment. See also unidirectional printing.

For Windows

Right-click the printer icon on the taskbar, and then select the Print Head Alignment. Or access the printer software, click the Maintenance tab, and then click the Print Head Alignment button. The printer prints test patterns that you use to check the print head alignment. Here are sample printouts.

Here are the most common causes of a printer printing faded text or images: Low ink or toner levels. Toner sticking to the fuser roller or problems with the transfer roller. Low ink or toner density settings.
To prevent the degradation of inkjet prints, store them in a cool and dry place sealed with pollutant-resistant material. Additionally, using high-quality ink and paper as well as placing your printer in an environment-friendly space can help to prolong the life of inkjet prints.
Laser printers are in it for the long haul and are more economical than inkjet printers. Laser printers use toner cartridges which print thousands of pages so you don`t need to worry about replacements anytime soon.
While you still should keep your distance from that coughing coworker, you also should avoid sitting near the printer, as its toner could be toxic to your health.
There are numerous benefits to printing double sided pages. Getting the obvious out of the way, for one, it saves on paper. That in turn means printing double sided documents also saves ink, money, and resources.
Click the application pop-up menu, and then select Layout. The Layout setting options appear. Select the Short-Edge binding or Long-Edge binding option for the Two-Sided print setting. Change other printer settings, if needed.
Print on both sides of the paper (Windows)

Open the document, and then click File > Print. Select your printer, and then click Printer Properties, Preferences, or Printer Setup. From the print settings, select the option for a two-sided print job.

Click the application pop-up menu, and then select Layout. The Layout setting options appear. Select the Short-Edge binding or Long-Edge binding option for the Two-Sided print setting. Change other printer settings, if needed.
Automatic Duplex Printing (normal paper):

The printer can print on both sides of the paper For paper fed from a paper tray or the multi-purpose tray, duplex printing is carried out automatically if you set this in the printer driver upon executing the print command.

Click the application pop-up menu, and then select Layout. The Layout setting options appear. Select the Short-Edge binding or Long-Edge binding option for the Two-Sided print setting. Change other printer settings, if needed.
Print on both sides of the paper (Windows)

Open the document, and then click File > Print. Select your printer, and then click Printer Properties, Preferences, or Printer Setup. From the print settings, select the option for a two-sided print job.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Left side light printing
ANSWER : A possibility could be the Charge Transfer Roller mount on the left side broke and it’s not lifting up to push the paper up to the cartridge drum. Take the cartridge out and push down on each end and see if they respond in the same way.

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Brother MFC 8640D

Light streaks on the left side of printed image top to bottom
ANSWER : Most likely cause would be the imaging unit. http://www.precisionroller.com/drum-units-for-konica-minolta-magicolor-1600w/products.html

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Brother MFC 8640D

paper will not load right, only on the left side then jams. Worked fine this am, 2 hours later this happens
ANSWER : There is something in the paper path on the right side blocking it. Could be a torn scrap of paper, a dead bug, etc. Use a piece of file folder to push it out.

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Brother MFC 8640D

when click on Charms top right side of screen can't print
ANSWER : You picked a good user name. After reading your post, that’s what I am.

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Brother MFC 8640D

Print is light at the upper left
ANSWER : One thing it won’t be is the fuser. I can’t see it being limited to just the one corner, it would be all the way down the page if it were a printer problem. Could possibly be some dirt on the laser scanner mirrors. The transfer roller just pulls the paper down from the toner cartridge drum. Unless it was really dirty from built up toner, I can’t see it being the problem. You can wipe it off with a dry paper towel. Do not touch it with your fingers.

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Brother MFC 8640D

light or no printing
ANSWER : BTW, I took the fuser assy out and it’s sitting there, staring me in the face. Is there any thing I can do to see if it’s bad? Could this be an electronic failure? Is there anyway to get a service manual on this? (with schematics?)

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Brother MFC 8640D

My epson wf-3640 has two flashing blue lights going and will not print on command?
ANSWER : I think it is illicit anticompetitive behavior both quick essay service here in Australia and likely in different purviews too for them to look to cripple non specific ink use – and now it turns out it impairs their own particular ink and printer as well.

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Brother MFC 8640D

Smudges down right side of paper
ANSWER : That doesn’t make any sense. Sheets that feed from the manual feed or the cassette tray both converge before the toner cartridge. That would mean that the smudges would somehow be put on the paper as it was feeding upwards from the tray. There is nothing in the printer that could account for that happening.

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Brother MFC 8640D