Sharp SF-A18, Руководство по обслуживанию

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3) Original size detection by the paper feed motor
rotation sensor (DFMRS)
This function compensates for the inaccuracy of the original size
recognition in the original tray when originals of different sizes are
stacked in the original tray. That is, results of this function has priority
over the original size detection in the original tray. The pulses of the
slit disc rotation of the feed motor (DFM) are counted in the period
before the rear edge of original is sensed (DFD output LOW) by the
original feed sensor after the feed motor (DFM) has started reverse
rotation, that is, after the resist roller has started rotating and feeding
of original from the fed section to the transport section has been
started, to determine the original length.
To improve detection accuracy, the original width is sensed also by
the paper feed section original width sensor (DWS).
Resist roller rotation start (The original is fed from the paper feed
section.)
The paper feed motor rotation sensor (DFMRS) counts the number of
rotations of the paper feed motor (DFM) between
A
and
B
to judge
the original length.
[6] DISASSEMBLY, ASSEMBLY AND
ADJUSTMENT
* Descriptions in this chapter excludes simple disassembly and as-
sembly operations. Refer to the parts guide for the disassembly
and assembly of parts which are not explained here.
*
Refer to the description in [7] ACTUAL WIRING DIAGRAM for the
processing of the wiring during assembly.
1. Transport section opening
1
Loosen two screws which are fixing the hinge stopper to allow the
hinge stopper to move.
2
Slide the hinge stopper downward by using the step screw, fit the
dove with the hole and tighten the two fixing screws which were
loosen before.
3
Open the transport section.
A
B
Original feed sensor (DFS)
Resist roller
Original feed sensor (DFS)
detects the original rear edge.
Original feed sensor (DFD)
Resist roller
Screw (Loosen.)
Hinge stopper (Move down.)
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