Laser Optics
G160/G161 3-4 SM
6. Adjust the skew adjustment cam [A] for each color with a screwdriver. You must
adjust the skew values for each color until they are all the same as the value for
magenta that you found in step 1, before you replaced the LDU.
For example: If the new value for K (after step 4) is –300 and the old value for
magenta (in step 1) is –250, you must adjust the skew for K until it is –250.
Turn the cam as shown in the “Cam Rotation Direction” column below to increase
the skew value.
Turn it in the opposite direction from this to decrease the skew value.
“Adjustment value” shows the change when you turn the cam one click.
Color
Cam Rotation
Direction
Adjustment
Value
Yellow CW 14 μm
Cyan CW 10 μm
Magenta CCW 10 μm
Black CCW 10 μm
The adjustment values in the table are not exact values. These are
approximate values.
CW: Clockwise, CCW: Counter-clockwise
The diagram shows the effect on line skew [B] when you turn the cam in a
counter clockwise direction.
7. Close the left cover. Then measure the skew values again with SP 2111 3. (To do
this, repeat step 3.)
If these are close to the value for magenta that you found in step 1 (within one click
in the above table), go to the next step. If not, do SP 2111 3 again until you get a
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