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/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 5-19.
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.
138 Chapter 5 Theory of operation ENWW