Sharp FO 4400 - B/W Laser - All-in-One Service Manual page 59

12. PRINT SEQUENCE
Printing is carried out following communication between the engine and
controller that determines the timing to be used.
A general outline of the printing sequence is described below.
Controller
Initiates the printing
command.
Receives the vertical
direction synchronizing
signal.
Receives the main-
scanning direction syn-
chronizing signal.
Sends video data for
one scan.
NO
Has one page
been completed?
YES
/PRINT
Prepares for printing
- Print head
- Feeds a sheet of paper, etc.
Sends the vertical direction
/TOD
synchronizing signal when
the Paper Take-Up Sensor is
ON.
/HSYNC
Sends the main-scanning
direction synchronizing signal.
/VIDEO
Prints out video data for
one scan.
Printing is completed.
Fig. 13
3 – 7
FO-4400U
FO-CS1
Engine