Quote:
Originally Posted by astro744
I always thought there was another drum inside the machine or is it called diffuser!
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There are no additional drums but there is typically a pair of rollers one
of which has the fuser in it (not diffuser) through which the paper passes.
The fuser is a heating element which heats up the assembly to around
400°C to bond the toner to the paper.
Due to this heating/cooling cycle as they print, the fuser can fail over time
but typically again you can buy a replacement kit. One telltale sign that
a fuser may have failed is the toner doesn't adhere and makes a mess.
Quote:
Originally Posted by astro744
I think you may be right with the HP cartridges as each has a green glass roll which I guess is the drum.
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That green glassy roll is the drum. Drums would typically be coated
with selenium but sometimes germanium or silicon.
They are photosensitive. There is a shutter mechanism that creates an
aperture slit across the drum. When putting in an new cartridge, avoid
opening that shutter or exposing it to sunlight or bright light.
Back in the day when the drum was its own subsystem within the printer
and essentially there for the life of the printer, any contaminant or blemish
on the drum would result in an annoying mark on the printed output
forever.
With the advent of the drums inside the toner cartridges any defect would
go away once the toner cartridge was replaced. The downside is that the
cartridges are much more expensive than back in the days when they
simply contained the toner. It's a good idea to drop them off somewhere
that recycles them to re-use or harvest some of the materials rather than
letting them go to landfill.