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the laser shoots a beam at the drum while its rotating. where ever the laster touches the drum, no toner will stick to it, or in other words where ever the laser beam dosent touch the drum, toner sticks... creating the lettes on your page
The laser pulsates, frequency mattering by model of the printer to my knowledge, onto a negatively-charged photoelectric drum.

The drum being charged by the Conditioning process.

When the laser contacts the photoelectric drum: It creates a neutral space where the toner can be picked up in the Developing process. Millions of strikes a second creates multiple letters, drum rotates, picks up toner. . . So on so forth.

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Q: What is the chief function performed by the laser used in a laser printer?
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