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HP LaserJet 9000dn Service Manual: Sequence Of Operation; Table 23. Normal Sequence Of Operation; Figure 31. Sequence Of Operation Block Diagram

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Sequence of operation

Operational sequences are controlled by the engine control system. Table 23 describes the
sequences.
Figure 31.
Sequence of operation block diagram

Table 23. Normal sequence of operation

State
WAIT
STBY
(standby)
80 Chapter 5 Theory of operation
Period
From the time the power is
switched on until the surface
temperature of the fuser and
pressure rollers reach their
WAIT target value (four minutes
or less.)
From the end of the WAIT
period to the input of a print
reservation command from the
formatter.
-or-
From the end of the LSTR
period until either a print
reservation command is input
from the formatter or until power
is switched off.
Operation
l
power on, CPU, and ASIC initialize
l
fan rotation (fans 1-6 for 30 seconds, duplexer fan for 3
seconds)
l
formatter interface communication starts
l
fuser heaters turn on
l
cartridge check
l
cartridge memory check for toner level
l
optional interface communication (duplexer, tray 1, tray 4,
paper handling)
l
cassette checks (lifting and paper installed)
l
jam check (auto flush/eject)
l
fuser wrapping jam detect
l
door open/sleep check
l
fuser roller temperature control and delivery motor
l
fuser control (fuser roller temperature—180 degrees C (356
degrees F)/pressure roller 140 degrees C (285 degrees F))
l
print reservation command (awaits INTR sequence)
l
fan motor drive control (fans 1-5 half speed rotation; fan 6 is
off)
l
fuser roller deformation prevention (fuser/delivery motor
rotates every hour for >8 seconds to prevent deforming the
roller)
C8519-90912

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