HP LaserJet 4300 Series Spezifikationen PDF herunterladen (Seite 136)

116 Theory of operation Q2431-90912

Staple level detection

The stapler/stacker driver PCA uses the staple-detection switch to detect the presence and

number of staples in the stapler unit. A spring on the staple-detection switch holds the staple-

detection flag in the raised position. When this flag is fully raised, the switch is open.

There is a slot cutout in the bottom of the staple cartridge. If the staple cartridge is mostly full of

staples, the staples block the staple-detection flag’s movement so that it cannot move to its

raised position. The staple-detection switch is closed, and the stapler/stacker driver PCA

determines that there are at least 70 staples in the cartridge. When less than 70 staples are left

in the cartridge, the staple-detection flag is no longer blocked and moves to the raised position.

The staple-detection switch opens, and the stapler/stacker driver PCA determines there is

low-staple condition.

A low-staple message appears on the control-panel display. After the stapler/stacker PCA sends

the staple command 70 more times, a staple out message appears on the control-panel display.

See “Alphabetical printer messages” on page 258.

Figure 49. Staple level detection

Stack mode feed and delivery

In this mode, media is stacked in the delivery bin without being stapled.

After the leading edge of the media reaches the fixing delivery sensor (PS108),the DC controller

PCA sends a signal to the stacker driver PCA. The stacker driver PCA activates the deflector

solenoid (SL101) for a specific amount to move the delivery deflector into place which routes the

media to the stacker rather than to the printer’s top output bin. The stacker driver PCA also

activates the stacker motor (which rotates at the same speed as the printer’s main motor) to

rotate the feed and delivery rollers.

The feed roller moves the media into the stacker. If the DC controller PCA sends a

following-page signal (meaning there is another page in the job), the stacker driver PCA again

activates the deflector solenoid (SL101). The delivery rollers move the media to the delivery bin.

Staple-detection flag

Staples

Stapler unit

Staple-detection

switch

Over 70 staples in the cartridge

Less than 70 staples in the cartridge

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HP LaserJet 4300 Series Spezifikationen Seite 136