ENWW Engine control system 129
/BD1, /BD2, /BD3, /BD4 (HORIZONTAL SYNCHRONOUS) signals (formatter input): This signal
synchronizes the horizontal (main) scanning line: the reference signal in the horizontal direction of
the laser beam. When the /TOP signal is received, the formatter counts the /BD signals of each
color and sends each color’s VIDEO signal synchronized with each /BD signal corresponding to
the specific number of scanning in sequence to the DC controller. This justifies the writing position
of the image. The figure below illustrates the output timing of the VIDEO signal synchronized with
the /BD signal.
Figure 5-18 Output timing of the VIDEO signal synchronized with the /BD signal
● SERIAL CLOCK (SCLK) signal (formatter output): The formatter outputs this synchronizing
clock signal when it sends or receives a status or command to or from the DC controller. The
formatter sends a command in synchronization with the falling edge of the SCLK signal, and
receives a status in synchronization with the start-up of the SCLK signal.
● STATUS COMMAND (SC) signal (formatter input and output): This is a bi-directional signal
to send and receive a serial data between the formatter and the DC controller. The formatter
and the DC controller send and receive a status or command with this signal.
● STATUS CHANGE NOTIFY (/CCRT) signal (formatter input): This signal notifies the
formatter of any specific status changes to the printer. The formatter refers to the DC controller
through SC line to find out which status has changed upon receipt of a CCRT signal.
● PAPER FEED (/PFED) signal (formatter input): This signal indicates that the printer engine
is ready to pick up paper. When a /PFED signal is received (becomes “L”), the formatter sends
a pickup command for the optional feeder to the DC controller.
● PAPER DELIVERY (/PDLV) signal (formatter input): This signal indicates the delivery
timing from the printer to the optional feeder. When a /PDLV signal is received (becomes “L”),
the formatter sends a delivery command to the DC controller.
● PAPER RE-FEED (/TOPR) signal (formatter input): This signal notifies the formatter that the
printer is ready to pick-up paper for duplex printing. When a /TOPR signal is received
(becomes “L”), the formatter sends a duplexing pick-up command to the DC controller.
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