Laser Printer Question re Drum Discharging

Hello,
Just gave a Brother HL 2140 Laser Printer as a gift. It's their real cheap one, under $ 100
Was just wondering about the "Laser" part.
I can't believe that for this price they have a true galvo. or rotating prism, or other type of scanner in it.
How do they discharge the drum, then ?
Might it be nothing but a row of LED chips on perhaps 0.001 spacings ?
A row of Laser Diodes ?
Or ?
Any idea how it's done so cheaply ?
Thanks, B.
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