Canon i-SENSYS MF729Cx Important Safety Instructions And Installation Manual page 565

On
<Menu> <Printer Settings>
Pure Black Text
If the text object is black (R=G=B=0%, C=M=Y=100% or Bk=N%, C=M=Y=0% or Bk=100%), this setting specifies whether the text
is printed using black only.
Off
On
Depending on the data to be printed, <Toner Save> may not be applied even if <On> is selected.
If <On> is selected for <Toner Save>, very light or finely detailed images may not be printed clearly.
<Menu> <Printer Settings>
<Off>
The black text is printed using CMYK toners based on the selected Output Profile setting. For some jobs, it is
preferable to turn this option <Off>.
<On>
Black colors generated by applications are printed using only 100% black toner. This means that the color toner will
not be misaligned since only one toner color (black) is used.
Black Overprint
Where a black text object is printed on a color background or overlaps graphics, this setting specifies that black text is overprinted
onto the background. This enables you to prevent the problem of white knockout in the background behind printed black text objects.
<PS> <Print PS Errors>
<PS> <Pure Black Text>
Select <Off> or <On>
Select <Off> or <On>