Dell Color Laser Printer 1320c Printing Problem Please help!

Hi all,

I have a  Dell color laser printer 1320c trying to do a printing with it, but the Printer only  print 3 sides of the design page instead off all 4 side of the page, I have also try to solve this problem by use all of the information from the Troubleshooting Guide by checking the amount of toner in each toner cartridge, Set Toner Saving Mode to Off in the printer driver but I still just can't make it print all 4 sides of the design on the page.

Please help!

Thanks