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Chapter 6 Principle of Operation
2. Flow of Print Data
The NIC (Network Interface Card) of the printer connected with a network receives a packet signal in a
bit stream from a client or server of the network, and decomposes the packet signal received next into
a data format adapted for a layer from which the data is sent to the Controller. The Controller processes
the data from the NIC by the same method as for data received from the host computer via a parallel
port. (These two types of data are referred to as host data.)
PWBA ESS acts to buffer the rasterized bit-image host data or converts host data in PDL (Page
Description Language) into rasterized bit-image data. The PWBA ESS sends each line of the rasterized
bit-image data to the MCU of the HVPS/MCU whenever the laser beam makes a scan.
This signal carrying image data (/VDO signal) is converted into LVDS signal by the MCU of the HVPS/
MCU, and is sent as XP.DATA+ and XP.DATA- signals to the ROS ASSY, where the signal is
converted into a laser beam. The beam is emitted with a quite small diameter. The beam is turned ON
and OFF according to the video signal. The laser beam is reflected off the surface of a rotating polygon
mirror, so that the beam is concentrated to the surface of the drum of the EP CARTRIDGE by a series
of lenses. As a result, an electrostatic latent image is created on the drum surface.
Print data (electrical signal) from the printer controller is converted into a print image through the
following flow.
Host (electrical signal)
Printer controller (electrical signal)
MAIN PWB (electrical signal)
ROS ASSY (laser beam)
Latent image on drum (invisible)
Toner image on drum (visible)
Toner image on paper
Print image on paper
JG6105AA
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