Canon BJC-4200 - Manual (Page 50)

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Your printer is equipped with a print head cleaning function to ensure constant high
quality printing.
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If you are using Windows, you can execute print head cleanings from the Control
sheet in the printer driver. Simply click on Clean Ink Head.
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If you want to clean the print head from the operator panel, follow these steps:

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{ Make sure the green power light is on.

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{ The power light will blink for several seconds while the print head is being
cleaned.