Canon iR C6800 Series Portable Manual page 315

Subheadi
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SCR- Use it to select halftone processing for film/photo mode.
SLCT
Method of Adjustment
If moire is found in the output image or the dots make the image appear
too coarse while the default (1: use screen with fewer lines) is selected,
change the setting as follows:
- if moire is noted, change to '0' (use error diffusion); this setting is suited
to the reproduction of text.
- if the image appears too coarse because of the dots, change to '2' (use
screen with more lines).
settings
0: use error diffusion
1: use low-number screen (at time of shipment/upon RAM initialization)
2: use high-number screen
at time of shipment/upon RAM initialization: 1
TMC- Use it to switch over coefficients used for error diffusion processing.
SLCT
If the output image has started to show uneven density or rough texture
as more and more prints are made, change the setting for better dot
stabilization so that the fault may be less noticeable.
settings
0: standby
1: decrease sensitivity to grain/low stability
2: increase sensitivity to grain/high stability
at time of shipment/upon RAM initialization: 0
D-CLN-
Use it to change the length of drum idle rotation.
TM Use it to prevent soiling in the form of dots occurring in keeping with
drum rotation.
The machine executes idle rotation when it is turned on to remove
residual matter from the drum.
Settings
0: do not execute idle rotation
1: execute idle rotation for 30 sec
2: execute idle rotation for 60 sec
at time of shipment/upon RAM initialization: 0
Settings 3 through 6 are reserved (currently invalid).
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