Canon mp628 Service Manual page 41

4-3) Rotate the Easy-Scroll Wheel counterclockwise step by step. The LCD is divided into 16 segments, representing each step. The color
of a segment corresponding to the step changes from green to blue.
If the wheel is rotated clockwise before counterclockwise round completes, the color of segment(s) corresponding to the number of
steps the wheel is rotated clockwise returns to green.
If the wheel keeps rotated counterclockwise over 1 round (16 steps), the color of segment(s) corresponding to the extra number of steps
returns to green, starting with the "Start" segment in the figure below.
4-4) When the Easy-Scroll Wheel is rotated counterclockwise 1 round (16 steps, and all the segments are in blue), press the OK button. The
color pattern is displayed on the LCD.
If there is any segment that is not in blue when the OK button is pressed, the display remains unchanged.
5) Adjust the transparent color and LCD flicker, as follows:
5-1) Press the OK button. "OK1" in white is displayed on the black background.
If the result is not good, "NG1" in black is displayed on the white background (transparent color) immediately after "OK1."
5-2) Press the OK button. "OK2" in black is displayed on the white background.
If the result is not good, "NG2" in white is displayed on the black background (transparent color) immediately after "OK2."
5-3) Press the OK button. The machine returns to be ready for selection of another function ("Service Mode Idle" is displayed on the LCD).
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