Canon CLC1000 Service Manual page 95

2. Synchronization Control for the Main/Sub Scanning Direction
The video signals are synchronized for the main scanning direction based on the BD signal by the video
controller. The video signal after gamma correction is written to the memory for main scanning direction
synchronization in response to the main scanning sync signal (HSYNC) based on the write BD signal
Reading from the memory for the main scanning direction is executed based on the BD signal for Y, M,
C, and Bk. In the sample shown in Figure 3-410, the Y main scanning sync signal (YSYNC) is generated
in sync with the Y BD signal (YBD); the read enable signal (YRE) is generated after a specific period of
time* following the generation of YSYNC; and the Y video signals are read from the memory for the main
scanning direction.
*May be changed; used for image position correction explained later.
Video control PC6
BD
detection '
PCB
Write BD signal (WBD)
Y BD signal (YBD)
main
Y scanning sync signal
Y read enable signal (YRE') 7
Y video slgnal (YVD)
3-68
Clock
generation
for
Figure3-409
Figure 3-410
CANONINC.
CRE, BkRE
I
I
IN
r