Printer Control Components; Machine Control Unit Pwb (Mcu Pwb); Components Attached To Or Associated With The Mcu Pwb - Epson EPL-N4000 Service Manual

EPSON EPL-N4000/EPL-N4000+

2.7.1 Printer Control Components

The Printer Control is make up of the MCU PWB and numerous
connected components.

2.7.1.1 Machine Control Unit PWB (MCU PWB)

Receives status and command information from sensors and from the
C262 Main board. Controls most printer operations. The MCU PWB
performs nine major functions:


Communicates with the Printer Controller (C262 Main Board).


Maintains the system clock.


Controls the printing process.


Controls the ROS, the Fuser, and the drive assemblies.


Distributes +5VDC and +24VDC to various printer components.


Monitors printer status.


Maintains a running print count.


Maintains NVRAM settings.


Controls printer options.
2.7.1.2 Components attached to or associated with the MCU
PWB:


Low Voltage Power Supply
Converts 110VAC to +5VDC and +24VDC.


C262 Main Board
Connected to the MCU PWB through the C262 Main Board. The
interface between the print engine and the host computer. The ESS
processes the raw video data sent by the host computer.
Rev.B


Control Panel
Connected to C262 Main Board, the Control Panel displays status
information send from the MCU PWB and C262 Main Board.


AC Driver PWB
Switches 110VAC to the two Fuser Heat Rods. Fuser temperature
sensors are connected to the AC Drive PWB. The AC Drive PWB
sends the temperature information to the MCU PWB.


High Voltage Power Supply
Converts +24VDC received from the MCU PWB to several high
voltages that are required by printer xerographics.


Toner Sensor
Magnetic sensor that monitors the CRU toner level.


CRU
Drum usage information that is stored in the CRU.


ROS
The SOS (Start of Scan) Sensor, the ROS Motor, and the Laser
Diode.


Main Motor
Provides most of the mechanical drive for the printer.


Fuser Fan
Cools the Fuser area.


Feed Clutch
Transmits Main Motor drive to the Tray 1 Feed Rolls.


Registration Gate Clutch
Transmits Main Motor drive to the Registration Rolls.


Fuser Exit Sensor
Monitors paper travel out of the Fuser.
Chapter 2 Operating Principles
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