HP LaserJet Enterprise M552 - DC controller

DC controller
The DC controller controls the operation of the printer and its components. The DC controller starts the
printer operation when the printer power is turned on and the power supply sends DC voltage to the DC
controller. After the printer enters the standby period, the DC controller sends out various signals to operate
motors, solenoids, and other printer components based on the print command and image data that the host
computer sends.
Figure 1-4 DC controller block diagram
LED
Motor
Fan
Solenoid
LED
Accessory
HIP
Fuser
AC input
Photointerrupter
Sensor
Motor
Fan
Fan
T2 roller
Cartridge
(Y/M/C/K)
High-voltage
power supply T
Fuser
power supply
DC controller
Low-voltage
power supply
Motor
Fan
Solenoid
Photointerrupter
Switch
ITB ass’y
Laser scanner ass’y
Control panel
Formatter
Clutch
Sensor
High-voltage
power supply D
Fan
Sensor
LED
Mo
t
o
r
F
an
S
olenoi
d
LE
D
Accessor
y
H
IP
Fuse
r
AC
inpu
t
Photointerrupter
S
ensor
Mo
t
o
r
Fan
F
an
T2 r
o
ll
e
r
C
artrid
ge
(
Y
/
M
/C/
K
)
H
i
g
h-volta
ge
p
ower suppl
y
T
F
use
r
p
ower suppl
y
D
C
controller
Low-volta
ge
p
ower supp
ly
Mo
t
o
r
Fan
S
olenoi
d
Photointerrupter
S
witc
h
ITB ass
’y
Laser scanner ass
’y
C
ontrol panel
F
o
rm
a
tt
e
r
C
lutc
h
S
ensor
H
i
g
h-volta
ge
p
ower suppl
y
D
F
an
S
ensor
S
12 Chapter 1 Theory of operation ENWW