Subparameter u
In the Canon LBP, when many fonts are used such as EPSF, TPIC, and Windows TrueType Japanese fonts, sometimes unintentional white lines are inserted in the horizontal direction in the printed result, or even the LBP downs requiring the service man call.
When this subparameter is specified, you can avoid such problems in some case.
Integers are specified its arguments. You can also specify this by giving minimal unit and pins in the printer's CFG File.
The defaults are minimal unit=1 and pins=8. But if n is specified in the argument, the absolute value of n changes to the minimal unit. If n is negative, pins changes to 24.
If you have a problem in printing, u10 or u-10 might be helpful. Also see Subparameter c.