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HP LaserJet 9000dn Service Manual: Optional 3000-sheet Stapler/stacker; Controller Pcb; Power Supply; Power-on Sequence

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Optional 3000-sheet stapler/stacker

The 3000-sheet stapler/stacker is a multi-speed output device. It staples up to 50 sheets of plain
paper at a time and can hold a total of 3125 sheets—3000 sheets in the stapler bin and 125 sheets,
not stapled, in the face-up bin.

Controller PCB

Communication and control of the 3000-sheet stapler/stacker is accomplished through the paper-
handling controller embedded on the formatter in the printer. The 3000-sheet stapler/stacker has a
controller board that receives signals and commands from the paper-handling controller and a power

Power supply

A universal power supply is activated when the printer's power switch is turned on. The printer's
paper handling controller sends a power-on signal to the power supply through the controller PCB.
The power supply provides +36 V for motors and +5 V for sensors and controller electronics. The
power supply is also activated when the controller PCA is set to service mode.

Power-on sequence

When the 3000-sheet stapler/stacker is turned on, or a door is opened and closed, the 3000-sheet
stapler/stacker executes the initialization routines as follows:
Initialization in parallel for the paper path, accumulator, stack holder/tray, and the carriage.
When the accumulator initialization is complete, the flipper will initialize.
After a successful power-on sequence, the error light is green. If the power-on sequence is not
successful, a jam condition or a hardware malfunction is indicated through the printer control panel
and the error light is amber.
106 Chapter 5 Theory of operation




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