Ricoh VT3500, Service Manual

Page: 60 / 330

[Electrical Timing for Image Shifting Mode]
The image is shifted in the sub-scanning direction by changing the start
timing for the original feed or master feed. (In the main scanning direction,
the image is shifted by changing the output timing of the image data in the
image processing PCB. See "9.3 IMAGE PROCESSING PCB".)
When the original image moves forward in the sub-scanning direction on the
print, the shift is represented by a minus (–). The opposite shift is represented
by a plus (+). The shift length is represented as "L". For example, if the
original image moves 100 millimeters backwards in the sub-scanning
direction, this is represented as "L=(+)100 mm".
There are three image shift cases to consider:
1) No shift or a backward shift of 7 millimeters or less
2) A backward shift of 8 millimeters or more
3) A forward shift
Because of the 10 millimeters blank margin at the top of the print and
because the first three millimeters of the original are not scanned, the
backward shift works differently when it is between 1 and 7 millimeters and
when it is 8 millimeters or more.
+ L
A
A
A
[Print]
[Original]
[Print]
L
Original Feeding Direction
1 December 1993
2-24