Horizontal stripes on Samsung ML-1640
The obvious answer is the "dumb" and arguably useless one -- the drum has been
damaged in some way.
Has the cartridge been left outside the printer for an extended time,
especially in bright light? Many laser printers use an organic
photo-conductive drum coating that can be damaged by prolonged exposure to
light.
Outside of cleaning the drum, and the entire paper path, I don't know what to
suggest.
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