Common Problems associated with a bad Printer Fuser
The fuser on your laser printer is essential to the function of your entire machine. After the laser and toner set your printed image onto paper, the final step is a run through the highly heated fuser to bond and set the toner to the page, creating the finished product that you pull out of the tray. However, fusers are also prone to far more wear and tear than any other part of the printer because of all the heat and pressure they create.
The easiest way to tell if you have a defective or malfunctioning fuser is a simple paper test. When you process a print job, take out the finished page and test the printed text or image. Toner is actually a fine carbon polymer powder that is magnetically attracted to the page. When a page with this powder on it runs through the rollers of the fuser, the high heat and pressure melt and fuse the toner to the page fast enough that it doesn’t burn the paper.
If a fuser is malfunctioning, you may see streaking, double imaging, or smudges. Streaking and double imaging are due to toner sticking to the rollers of the fuser, either smudging it in transit causing streaks, or continuing to rotate and reapplying the toner like a stamp effect, causing a double image. You should note however, that a toner cartridge and a few other things could also cause toner streaking on a page.
When you print a page, rub your finger over a section of print. If it smudges, or came out smudged in the first place, your fuser may not be completely melting and setting the toner properly. Problems such as these can be a result of worn gears, electrical component malfunction, worn or broken rollers, or a host of other reasons.
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