Basic operation
This chapter presents an overview of the relationships between major components in the product, and
includes a detailed discussion of the image-formation system. The following systems are discussed:
●
Engine control system
●
Laser/scanner system
●
Pickup/feed/delivery system
●
Image-formation system
Figure 4-1 HP LaserJet M2727 MFP system block diagram
Sequence of operation for the base unit
Operational sequences are controlled by the microprocessor and the DC controller.
Table 4-1 Sequence of operation
Name Timing Purpose
WAIT From power-on until the end of the main-motor initial
drive
Detects the 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 71 for
a complete description of the WAIT (power-on)
period.
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 product 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
70 Chapter 4 Theory of operation ENWW
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