Button And Lcd Test; Easy-Scroll Wheel Check - Canon MP640 Service Manual

(4) Button and LCD test

Confirm the operation after replacement of the operation panel board or LCD unit.
1) Click Panel Check of the Service Tool on the connected computer. The machine LCD turns blue, waiting for a button to be
pressed.
2) Press each button of the operation panel, to see if every button functions properly.
3) The LCD is divided into 16 segments, representing each button. The color of a segment corresponding to the pressed button
changes to red. If 2 or more buttons are pressed at the same time, only one of them is considered to be pressed, and the other
buttons are ignored.
1. ON button
2. Back button
3. OK button
4. Up cursor button
5. Down cursor button
6. Left cursor button
7. Right cursor button
8. Black button
9. Color button

4) Easy-Scroll Wheel check

4-1) Rotate the Easy-Scroll Wheel clockwise step by step. The LCD is divided into 6 segments, representing each step. The
color of a segment corresponding to the step changes from red to green. If the wheel is rotated counterclockwise before
clockwise round completes, the color of segment(s) corresponding to the number of steps the wheel is rotated
counterclockwise returns to red. If the wheel keeps rotated clockwise over 1 round (6 steps), the color of segment(s)
corresponding to the extra number of steps returns to red, starting with the "Start" segment in the figure below.
4-2) When the Easy-Scroll Wheel is rotated clockwise 1 round (6 steps), press the OK button.
10. Stop button
11. NAVI button
12. HOME button
13. Left function button
14. Right function button
15. + button
16. - button
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