Lexmark T640 Technical Reference page 183

•
If the requested media size is not found by the previous search, the following
search order is used:
— Tray 1
— Tray 2
— Tray 3
— Multipurpose Feeder
— Tray 4
— Tray 5
•
If the requested size cannot be located in any automatic source, a
configurationerror is issued and the job is flushed.
For printers that support automatic duplexing:
•
Automatic duplexing is not supported for custom-size paper or for envelopes
in the multipurpose feeder. Automatic duplexing is supported from the
multipurpose feeder for all other papers.
•
If the paper source is changed before the back side of a duplexed page
prints, a blank back page prints, the paper source changes, and the
information for the back side of the page is printed on the front side of a page
sent from the new paper source.
When these operators are used, it is equivalent to executing the following PostScript
emulation sequence:
<< /PageSize [ x y ] /ImagingBBox null /Policies << /PageSize 0>> >>
setpagedevice
x y
where are the PageSize in points.
4-5
PostScript