Canon imageRUNNER ADVANCE C255 Series, Service Manual, Page: 639 / 987

COPIER (Service mode for copier) > ADJUST (Adjustment mode) > IMG-REG
LSR-V-K1 2 Adj Bk wrt start pstn:vert scan, 1st sht
Detail To adjust the write start position of Bk-color image in vertical scanning direction when color
displacement occurs only with the image on the 1st sheet.
As the value is changed by 1, Bk-color image moves by 1 pixel.
+: Move in the trailing edge direction
-: Move in the leading edge direction
Since image formation is performed based on Y-color, adjust the position of M/C/Bk-color even if
it seems that color displacement occurs only with Y-color.
Use Case When color displacement occurs only on the 1st sheet
Adj/Set/Operate Method Enter the setting value (switch negative/positive by -/+ key) and press OK key.
Caution Use this mode only when color displacement occurs on the 1st sheet.
Display/Adj/Set Range -5 to 5
Unit pixel
Appropriate Target Value 0
Default Value 0
Related Service Mode COPIER> ADJUST> IMG-REG> LSR-V-M1/C1
Amount of Change per
Unit
1
ITBDRBL1 2 For R&D
BEND-C 1 C-color laser distortion crrct:vert scan
Detail To correct distortion of C-color laser in vertical scanning direction. (Digital registration)
As the value is incremented by 1, degree of distortion is changed by 1 micro m with reference to
Y-color.
Use Case When distortion occurs in vertical scanning direction
Adj/Set/Operate Method
1) Enter the setting value (switch negative/positive by -/+ key) and press OK key.
2) Output a test print in COPIER> TEST> PG> TYPE> 6 (Grid).
3) Perform visual check, and repeat the procedures as needed.
Display/Adj/Set Range
-100 to 100
Unit
um
Default Value
0
Amount of Change per
Unit
1
SLOP-Y 2 Adjustment of image squareness
Detail To adjust skew of image (squareness) in vertical scanning direction by adjusting skew of Y-color
laser in vertical scanning direction digitally.
By performing auto color displacement correction after this adjustment, adjustment is made for
other colors in accordance with adjustment for Y-color.
Use Case When corners of an image are not square
Adj/Set/Operate Method 1) Enter the setting value, and then press OK key.
2) Turn OFF/ON the main power switch.
3) Execute auto color displacement correction.
Caution Be sure to perform auto color displacement correction after adjustment.
If the setting value is changed dramatically, be sure to perform auto color displacement correction
twice.
Display/Adj/Set Range -126 to 126
Unit um
Default Value
0
Additional Functions
Mode
Adjustment/Maintenance> Adjust Image Quality> Auto Correct Color Mismatch
Amount of Change per
Unit
1
8. Service Mode
628