Question about Dell 5310n Laser Printer

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Dell 5310n knocking noise when printing envelopes

Whenever we print envelopes to the Dell 5310n, it makes a loud knocking noise as the envelope feeds into the printer. We were told that this same printer is doing the same thing in our other office. What could this be and how can we fix this?

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  • lara609 Feb 27, 2009

    Thanks for the info. So why doesn't this happen to other printers? It's quite loud and annoying especially when you're on the phone.



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This is a good thing. The 'knocking' noise is actually called a "Thumper". It's purpose is to get the air out of the envelope before it hits the fuser. Air in the envelope typically leads to creases on the envelope itself.

Posted on Feb 27, 2009


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I'd advise looking at the rollers within the printer, to make sure they're not jammed, loose or stuck full of toner. Make sure you have the printer off for a while too, you don't wanna burn your hands off :)

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