Lexmark 4I3 - Manual (Page 63)

Note: The print may not get darker if the ribbon is worn or if
there is a problem with the print head.
3. To make the print lighter, press Lighter.
The printer displays
The print head moves farther away from the paper, and the print
becomes lighter.
4. When you release the key, the printer automatically saves the
current value.
Note: The ’s indicate the position of the print head relative to the
limits.
As long as you press Darker or Lighter, the printer displays an
increasing amount of darkness or lightness until one of the limits of
the gap is reached. The printer displays either
or
As you adjust the gap, you may also see the printer display
This message tells you that the forms thickness setting is at the
automatically set value.
LIGHT | -----------| DARK
LIGHT | | DARK
DARKNESS LIMIT REACHED
LIGHT | ------------------| DARK
LIGHTNESS LIMIT REACHED
LIGHT | ---------| DARK
DEFAULT DARKNESS
Chapter 1. Setting Up the 4230 Printer 1-41