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HP LASERJET ENTERPRISE M855 - Page 241

HP LASERJET ENTERPRISE M855
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Figure 1-175 Shift process for the staple unit
Stack trailing-edge
assist guide
Return roller
Stapler
Stack ejection roller
Swing guide
Staple unit
The stapler motor (M41) rotates the cam one turn for stapling. The stapler home-position sensor
detects the home position of the cam. The macro computer (IC13) on the stacker controller PCA
controls the forward and reverse rotation of the staple motor. When the stapler home-position sensor
is off, the stacker controller PCA rotates the stapler motor in the forward direction until the sensor
turns on, allowing the staple cam to return to the original position. The staple sensor is used to detect
the presence or absence of a staple cartridge in the machine and the presence or absence of staples
in the cartridge. The staple edging sensor determines whether staples are pushed up to the top of the
staple cartridge. For safety, the stacker controller circuit does not drive the staple motor (M41) unless
the staple safety switch (MS34) is on.
Figure 1-176 Stapling operation (1 of 2)
ENWW Booklet maker and booklet maker with hole punch 199

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