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HP LASERJET ENTERPRISE M855 - Page 236

HP LASERJET ENTERPRISE M855
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Booklet maker staple operation
The stacker unit provides 1-point front stapling, 1-point rear stapling, and 2-point stapling. The booklet
stapler provides 2-point center stapling.
Figure 1-167 Location of the staplers
Stapler unit
Stitcher unit
(front, rear stitch staples)
Stapler unit
The staple motor (M41) rotates the cam one turn for stapling. The macro computer (IC101) on
the stacker controller PCA controls the motor.
The staple home-position sensor detects the home position of the cam. When the staple home-
position sensor is off, the stacker controller PCA rotates the staple motor forward until the sensor
turns on, moving the staple cam to its original position.
The staple sensor detects presence of a staple cartridge and of staples in the cartridge.
194 Chapter 1 Theory of operation ENWW

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