Canon PIXMA MP500 Service Manual page 30

(II) After securing the waste ink tube with tape, be careful not to damage the tube in installing the machine unit
chassis in the bottom case unit.
With the units assembled, the tube conditions are not visible. To confirm the tube is free from damage,
perform the manual purging 3 or 4 times, and confirm that no strange noise is heard.
[Example: The tube is pinched and blocked as it is not fixed with tape.]
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