Xerox Nuvera 100, Service Manual

Page: 67 / 304

General Information 1-67
Paper Pick
To pick a sheet of paper, the process motor rotates clockwise, driving
the process drive belt and the compound gear counterclockwise. (Refer
to Figure 1-30.) Rotating counterclockwise, the compound gear turns
and, in turn, engages a gear train that rotates the pick roller clutch
gear counterclockwise. The paper pick electric clutch energizes for a
moment, engaging the paper pick clutch and allowing it to rotate one
revolution. The pick roller rotates and pulls a sheet of paper from the
paper tray. The sheet of paper trips the paper pick sensor to assure
that the paper was picked from the tray. If the paper is not sensed,
the pick solenoid is energized, up to six times, to rotate the pick roller
again to attempt to recover from the mis-pick and pick the sheet of
paper.
With the paper-pick sensed, the paper-feed motor drives the upper
and lower paper-feed rollers and carries the sheet of paper to the
paper preheater. On its way, the sheet of paper passes the deskew
fingers which are flexible, plastic fingers mounted on the front cover.
The deskew fingers guide the paper and create a buckle in the paper
which aligns the paper to the paper path.
The paper stops at the entry to the paper preheater, tripping the
paper preheater entry sensor on the left end of the paper preheater.
The paper also trips the paper width (A/A4-size) sensors on the right
end of the paper preheater to verify that the width of the paper is
within the printer’s specifications. At this point, the paper feed motor
is stopped to wait for more ink deposition on the drum.
When ink deposition is about 95% complete, the paper feed motor is
activated to bring the sheet of paper through the paper preheater and
to the transfix position. The paper preheater heats the paper to
improve ink transfer. The leading edge of the sheet of paper trips the
paper preheater exit sensor as it passes out of the paper preheater.