HP Color LaserJet Enterprise CP4020 - Page 37

DC controller
The DC controller controls the operational sequence of the product.
Figure 1-3 DC controller block diagram
Fuser
High-voltage
power supply T
ITB unit
AC input
Low-voltage
power supply
Motor
Solenoid
Photointerrupter
DC controller
Laser scanner unit
Formatter
Switch
Fan
Sensor
Print cartridge
(Y/M/C/Bk)
High-voltage
power supply D
Secondary
transfer roller
Motor
Fan
Clutch
LED
Motor
Solenoid
Photointerrupter
Control panel
Option
NVRAM
ICB
Solenoids
Table 1-2 Solenoids
Component abbreviation Component name
SL1 Primary transfer roller disengagement solenoid
SL2 Duplex reverse solenoid (HP Color LaserJet CP4525dn, HP Color LaserJet CP4025dn, and
HP Color LaserJet CP4525xh only)
SL3 Multipurpose-tray pickup solenoid
SL4 Cassette pickup solenoid
ENWW Engine-control system 5