MyBinding DC-545HC, Service Manual

Page: 48 / 175

45
⁄1
REGISTER MARK
Mark 1
1) The paper is transferred in increments of 0.1 mm
from PPS2, and the mark is read by the CCD.
2) When the edge of the reg. mark is detected, the
reference clock count in the CCD is stored in the
buffer in the microcomputer.
3) After another 0.1 mm is transferred, it is compared
with the clock count before the position of the edge is
detected, and if it is within a fixed range, the count is
then +1, and the reference clock in the CCD is stored
in the microcomputer buffer (up to 10 items). The
count is cleared if it is outside the range.
4) When the counter reaches 45 (the edge is the same
for 4.5 mm) the value for the mark is the average of
the values of the 10 values for the reference clock in
the buffer in the CCD.
MARK1
MARK2
10 mm
The clock count within 10 mm in
this space is 70.
CCD Reading Range
Paper Feeding
Direction
Basic clock
in the CCD
Read data
in the CCD
Mark 2
1) The edge of the REGISTER MARK is detected.
2) The paper is transferred in increments of 0.1 mm, and
the mark is read by the CCD. If the REGISTER
MARK has the position of the detected edge (it is
OK even if it is not the edge), if the counter is not +1,
the counter goes to 0 and returns to Step 1.
3) The position of mark 2 is determined as 1.0 mm
before the position when a continuous count of 10
(1.0 mm) is read for the REGISTER MARK.
0.1 mm
1.0 mm
REG.MARK Edge
Chap.2
⁄1
REGISTER MARK