I have just installed a duplex unit on the back on my color printer. It pushes the paper out (nearly) onto the output tray at the top and then tries to pull it back in to print side 2, but then there is a terrible sound of grinding cogs for 2 secs and then it stops with an error. Works just fine single sided.
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IF you have the optional duplex unit installed on your printer then when you go to print something, your printer setup screen should have a duplex/2 sided printing box you can check. This will be under printing preferences or properties. If you do NOT have the optional duplex option then you have to manually duplex. That means on say a 2 page document that you want 10 copies of you have to print 10 copies of page 1. Then take those 10 copies and place them back into the paper tray and print 10 copies of page 2 onto the backs of page 1.
Those are you 2 choices for duplex printing.
Good Luck and Thank You for using Fixya.
Check your toner cartridges, one of them is seized up. Remove all cartridges and turn the gear on the right side backwards ( counterclockwise) about 10 times and see if it turns smoothly. I don't know why but 90% of the time its the cyan that gets stuck.
I had this same problem however I was using the Magecolor 7450. I was trying to print a C5 postcard and the right hand side of the document was getting cutoff (aprox 2 in). Changing my Paper-Type settings on the printer from "Postcard" to "Any" magically fixed the problem.
if paper comes out straight, and lines in paper are not straight then there is problem wit laser unit, its not installed corrrectly, also you can check drum unit and transfer belt for correct installation.