<Similar, but not the same. Most copies are 'illuminate for white', most
<laserprinters are 'illuminate for black'. This means the corona wires are
<at different voltages, amongst other things.
Not as much as your expect. I worked with both the 3300 copier and the
printer version (XP12/24) and same for the Ricoh 1040(40ppm). It was
coincidence we had both in the group so copier repair was a common
task and not in my basic training. ;)
<Also, the scanning in a photocopier is entirely mechanical, and is (in
<general) synchronised mechanically. Laser printers have a lot of
<electronic sync stuff, things like the laser beam detect sensor, the
<registration shutter, etc.
Like I said different optics.
<Still, understanding a copier is a good starting point for understanding
<a laser printer. Just expect there to be a lot of changes.
The packaging of of the optical system is where the differece are
significant but a basic understanding of electrophotography is in order
and the xerox texts does cover reverse printing (uses reversed relative
electrostatic bias). FYI: when training the trainer I stopped a smart
ass FSE cold by tweeking the bias so everything was reversed. Took him
4 hours to swap everthing and not fix it.
Allison
Received on Fri Jan 30 1998 - 22:37:58 GMT