Hi, I'm new to AutoCAD LT 2011.  I'm trying to plot a drawing on D size and it always comes out small when plotted on the HP DesignJet 750's series plotter.  Can someone help?
 
Here's what I did:
 
1) I opened up a .dxf file
2) I clicked on "Layout1" to view the image.
3) Clicked on "Print".  clicked on "Plot".  I chose the HP DesignJet plotter I have.
4) I chose the large D size, 34" by 26"
5) I chose "Layout".
6) Scale is 1:1
7) when I click on "Preview", the image is always showing on the lower left corner
8) then, when I plot the drawing out, it's always small
 
Any suggestions how to fix this?  thanks.