Canon imageRUNNER ADVANCE C5500 Series Service Manual page 114

Fine adjustment of the image write start position in the horizontal scanning direction for each color:
COPIER > Adjust > IMG-REG > REG-HS-K
COPIER > Adjust > IMG-REG > REG-HS-C
COPIER > Adjust > IMG-REG > REG-HS-M
COPIER > Adjust > IMG-REG > REG-HS-Y
Rough adjustment of the image write start position in the vertical scanning direction for each color:
COPIER > Adjust > IMG-REG > REG-V-K
COPIER > Adjust > IMG-REG > REG-V-C
COPIER > Adjust > IMG-REG > REG-V-M
COPIER > Adjust > IMG-REG > REG-V-Y
■ Real-time Multiple Tone Correction
In order to always maintain an appropriate gradation performance, a patch of multiple tone correction is formed on the ITB and
*1
LUT correction is performed.
Function Features
The features of functions compared to the conventional ARCDAT control or D-half control are as follows.
• Correction control of areas of high density is possible by using the Patch Sensor.
• Since control can be performed according to various cases, it is robust against environmental changes.
• A high productivity is achieved because processing can be performed in real time without stopping the engine.
Differences Between Full Correction and Light Correction in Real-time Multiple Tone Correction
The real-time multiple tone correction in this machine is available in two types: full correction and light correction. Full correction
and light correction are the same in that a gradation patch is formed as notified by the controller and that density is notified.
The differences between full and light are as follows.
Features of full real-time multiple tone correction
• A 10-gradation patch is always formed.
• The entire lookup table is overwritten.
Features of light real-time multiple tone correction
• A patch with a smaller number of gradations is formed.
• The formed gradations are rotated.
• Part of the lookup table is overwritten.
Related Service Mode
D-max/real-time multiple tone control ON/OFF during warm-up rotation:
COPIER > Option > IMG-DEV > AUTO-DH
Setting of the error diffusion correction coefficient:
(Level 2) COPIER > Option > IMG-MCON > TMC-SLCT
Setting of the real-time multiple tone correction (full/light) feedback rate:
(Level 2) COPIER > Option > IMG-MCON > FL-FB
(Level 2) COPIER > Option > IMG-MCON > INT-FB
Setting of the c tone control correction (dither):
(Level 2) COPIER > Option > IMG-MCON > DITH-FB
Setting of the real-time multiple stone control (light) execution/stop interval:
(Level 2) COPIER > Option > IMG-DEV > INTPPR-1
(Level 2) COPIER > Option > IMG-DEV > INTPPR-2
Setting of the real-time multiple tone control patch pattern:
(Level 2) COPIER > Option > IMG-MCON > PTN-INT
*1. LUT is an abbreviation of "look up table". This table maps input values to output values. Normally, the capacity of (number of entries
in) the LUT table is equal to the number of gradations. For example, if there are 256 gradations, the number of data entries in the
table is 256. By mapping input values to output values with this table in advance, numeric values can be converted by looking up
this table.
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2. Technology