I use a Dell 3110 cn printer. There were black splotches whenever I printed envelopes.I had a serviceman look at it to no avail so I changed the black toner cartridge. I am now getting blue splotches. What could be the problem?

You don't really need to configure it as such.

The printer should recognise the duplexer if it is fitted correctly, and it's difficult NOT TO.

Printing a settings page will show the duplexer under Printer Options.

You printer driver needs to be aware of the duplexer, there is an option to 'get information from printer' within the Windows driver.

Once the driver knows the duplexer is available, you'll have an option in the printer driver to print double sided.

This has to do with the document printing properties. When you are ready to print a document, choose properties and make sure you go through the printer settings under that software.
The test page only verifies the cartridges. The printer properties of the software control the printer during printing.

check!, what colour is the xter you were hoping to print on the envelope, that you need to confirm from the printer settings, also on the envelope setting

Most likely a defective toner cartridge -try another one

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.

click on the following link
http://support.dell.com/support/topics/global.aspx/support/my_systems_info/manuals?~ck=ln&c=us&l=en&lnki=0&s=gen
download the maual and print it if yu want.

you'll need the fonts..go to support.dell.com and see what they can offer.

Switch the pink cartridge with the black one.

service your scanner assy .scanner glass need for clean

I have(had) the same problem using the Dell A920 printer on a Dell compunter running XP. After spending a hour trying to find a solution on the internet, I finally found a solution on my own. When ready to print a envelope. Go to File/Print Click Properties button In lower right hand corner, check "Print Color Image in Black and White" box Click OK button Click OK in print pop up When finished, repeat to uncheck "Print Color Image in Black and White" box to allow for color printing.