Timing
The microprocessor on the ECU controls the device operation sequences. Table 4-1 Operation
sequences on page 69 describes engine operations for each period of a print operation. Figure
4-19 Operational sequences on page 70 provides a graphical representation of the operation
sequences.
Table 4-2 Power-on sequence on page 72 describes each step of the power-on
sequence.
Table 4-3 Power-on sequence for the ADF/scanner assembly on page 72 describes the
ADF power-on sequence.
Table 4-1 Operation sequences
Name Timing Purpose
WAIT From power-on until the end of the main motor initial
drive
Detects presence of a print cartridge. Clears potential
from the drum surface and cleans the transfer roller.
See
Table 4-2 Power-on sequence on page 72 for
a complete description of the WAIT (power-on)
period. Also see
Figure 4-20 Timing diagram,
HP LaserJet M3027/M3035 on page 71 for detailed
information about device timing.
STBY (standby) From the end of the WAIT or LSTR period until either
a print command is sent from the formatter or the
power is turned off.
Prepares the device to receive print commands
INTR (initial
rotation)
From the time of the print command until the pickup
solenoid is turned on.
Prepares the photosensitive drum for printing.
PRINT From the end of the INTR period until the top-of-page
sensor detects the trailing edge of the media.
Forms the image on the photosensitive drum and
transfers the toner image to the media.
LSTR (last
rotation)
From the end of the PRINT period until the main
motor stops rotating.
Delivers the last page of a print job.
After LSTR, the device either returns to STBY or, if
another print command was sent from the formatter,
enters INTR.
ENWW Timing 69
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