- HP Printer User Manual

ENWW Original feed/conveyance/exit section 13
ADF unit explanation
Each of these features is controlled by
PRCB (printer control board) and driven by
SCDB (scanner drive board).
1 Operation
a Pressing original against roller and
pre-feeding original
1 Pre-feeding the first sheet of original
By pressing the START button, M301
(original feed) rotates backwards at
high speed (MC301 (original feed
MC) is on) to raise the original
pressing plate. Since M301 rotates
backward at high speed, the original
feed starts by the action of the pick
roller and the feed roller. M301 stops
when a specified time has passed
after the original has turned PS304
(original registration PS/1) on.
2 Pre-feeding the second and
subsequent originals
When the currently scanned original
is conveyed and PS304 (original
registration /1) turns off during the
single side original copy mode, M301
(original feed) rotates backward at
high speed (MC301 (original feed
MC) is on), the prefeeding of the next
original starts. During the double-side
original copy mode, M301 rotates
backward at high speed after a
specified time when the scanning of
the back side of the first sheet of
original has completed, and the
prefeeding of the next original starts.
M301 stops after a specified time
after the original has turned PS304
on.
b Original conveyance operation
When the control signal is received from
the MFP after the pre-feeding operation
of the original has completed, M301
(original feed) rotates forward at high
speed (MC301 (original feed MC) is on).
The registration roller rotates and the
original is conveyed at high speed.
The forward rotation of M301 releases
the pressure on the original pressing
plate.
During the single-side original copy, the
conveyance switches to low speed
when the specified time has passed
after PS305 (original registration /2) has
turned on. During the double-side
original copy, the reverse gate opens
and the original passes through the
reverse gate to be conveyed to the
reversal section at high speed. (For
details on reverse and conveyance
control, refer to Original reverse and
conveyance control.)
c Scan operation
1 Single-side original copy mode:
The low-speed rotation of M302
(original conveyance motor) starts in
the same timing as the conveyance
procedure described above, and the
original is conveyed by the
conveyance roller. The scanning
starts when the specified time has
passed after PS306 (original
conveyance) has turned on.
2 Double-side original copy mode:
The back side of the original is
scanned first, then the front side. The
scanning procedure is the same for
both sides. M301 (original feed)
rotates backward at high speed
(MC301 (original feed MC) is on), and
the original is conveyed from the
reversal section to the read section.
Then it switches back to low speed
when the specified time has passed
after PS305 (original registration /2)
has turned on. At the same time,
M302 (original conveyance) starts
rotating to scan the original.
The scanning operation is the same
as for the single-side original copy.