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Check the transfer belt, also get a air spray can, look for the opening to the laser unit inside unit on top side, spray opening to remove dust or toner deposits. Lastly check fuser, it should have a uniform coating on it, if it looks faded in the corresponding area of fades you will have to change. Hope it helps.
Print a diagnostic page
If the steps above have not helped, print and evaluate a diagnostic page to see if the cartridges or the printer is causing the problem.
Make sure the printer is on and loaded with unused, plain, white paper.
Press and hold the Power button and then press the Cancel button. Release both buttons. The diagnostic page prints.
Figure 1: Power and Cancel buttons1 - Cancel button2 - Power button
Step 4: Note which cartridges printed which areas of the diagnostic page
You must identify which cartridge printed which part of the diagnostic page, so that if you find defects on the page, you will know which cartridge is the problem.
However, you can install different combinations of print cartridges in your printer, and different cartridge combinations print different diagnostic page patterns. Your diagnostic page may not look exactly like the picture below, but the right and left cartridges will print in the same areas of the page no matter which cartridges are installed.
Figure 2: Diagnostic page layout (the patterns in each area may look slightly different on your page)1 - Printed by the right cartridge2 - Printed by the left cartridgeNOTE:
If you are printing in reserve mode (one cartridge is missing), the missing cartridge's area of the diagnostic page will be blank.
Step 5: Check ink levelsNOTE:
If you have installed a refilled or remanufactured ink cartridge, or a cartridge that has been used in another product, the ink level indicator is inaccurate or unavailable.
Look in the middle of the diagnostic page. The bars with "E" (for "empty") and "F" (for "full") at each end show the ink levels in the cartridges. As ink is used, the solid color changes to a faded color.
Figure 3: Left (tri-color) cartridge almost full - right cartridge emptyFigure 4: Both left and right cartridges almost full
The toner cartridge is faulty. It is possible that when you pulled out the strip that the whole thing didn't come out. Return the cartridge (with a couple of printed sheets to demonstrate printing) and the receipt and you should get a replacement.
That printer is pretty old. Are you selecting "Best" quality when you print or is it possible that some documents are being printed in Quick Print mode (which puts less ink on the page)? If you're doing the same thing on each print job but the print quality changes, there's definitely a problem. If you're printing from web pages, the print quality may be a factor of the design of the pages. If you print two pages of a multi-page document and quality declines, you should be able to get help through Lexmark's technical support.
I have a SCX-4100 Samsung, replaced the tonger cartridge, it was working fine for a few hundred sheets of printing, but after that, the left side of the page was printed very light, faded. If I run the "Clean Drum", it will print a litter better, but still faded. What can I do to correct this problem? Thank you TT