HP LaserJet 5200

Engine control system
The engine control system coordinates all printer functions and drives the other three systems.
The engine control system contains these components:
●
DC controller PCA
●
High-voltage power supply PCA
●
Low-voltage power supply unit
Figure 4-1 Engine control system
Table 4-1 Sequence of operation
Period Duration Purpose Remarks
WAIT period From the time the power is
turned on until the initial drive
for the main motor is
complete
Removes the charge that
creates a potential difference
from the drum surface, and
adjusts the drum phase
Detects cartridge presence
STBY (Standby period) From end of the WAIT or
LSTR period until either the
print command is received
from the formatter or the
power is turned off
Maintains the printer in
readiness for a print
command and maintains the
heater at a targeted
temperature
INTR (Initial rotation) From the time the print
command is received until the
pickup solenoid is turned on
Prepares the photosensitive
drum for printing and cleans
the transfer charging roller
PRINT From the end of INTR period
until the fuser paper sensor
detects the trailing edge of
paper
Forms the images on the
photosensitive drum and
transfers the toner image to
the print media
LSTR (Last rotation) From the end of the PRINT
period until the fuser motor
stops rotating
Moves the last printed sheet
out of the printer
The printer enters the INTR
period as soon as the
formatter sends another print
command
52 Chapter 4 Theory of operation ENWW