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The video signals are synchronized for the sub scanning direction by the video controller based on the
image leading edge signal (ITOP). The ITOP signal is triggered by the output of the transfer belt home
position sensor, and the timing of output varies according to paper size. When the ITOP signal is gener-
ated, the read enable signal for each color (YMRE in the case of Figure 3-411) causes the video signals
learned from the timing chart, the read enable signal for each color is given a delay for the distance
between drums.)
The video signal is forced to remain '0' until the print area signal (YFRM in Figure 3-411) is generated,
thereby creating a leading edge margin.
1997 CANON INC.
Sub scanning
sync CQntrol
Figure 3-411
Figure 3-412
CANON CLClOOO REV.1 MAY 1997
3. OPERATIONS AND TIMING m
Print area signal
PRINTED IN JAPAN (IMPAIME AU JAPON)
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