Epson C 2900 Manual

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3.5 ROS ASSY 
3.5.1 Major functions
- ROS ASSY
ROS ASSY is an exposure unit that generates laser beams to form electrostatic latent image on the 
drum surface.
In this manual, the ROS ASSY is referred to as ROS.
The ROS mainly consists of the following parts:
•  LD PWB
•  Scanner ASSY
•  SOS PWB
•  Lens
•  Mirror
•  Window
• LD PWB
The LD PWB is comprised of four LDs (laser diodes) corresponding to Y, M, C, and K....

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LD PWB Polygon Mirror
Scanner Assy
SOS PWB Lens
LensMirror
Mirror Mirror
Mirror
Window ROS ASSY Rear view illustration
SOS Sensor
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3.6 TONER CARTRIDGE & DISPENSER
3.6.1 Major functions
- CONNECTOR CRUM (PL5.1.14)
The CONNECTOR CRUM reads and writes the data of the CRUM.
Printer specific information is stored.
- MOTOR ASSY DISP YMCK (PL5.1.3)
The dispense motor supplies the drive to the Agitator and Auger in the TONER CARTRIDGE, and 
supplies toner to the developer.
MOTOR ASSY DISP (K)
MOTOR ASSY DISP (C)
MOTOR ASSY DISP (M)
MOTOR ASSY DISP (Y)...

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3.7 Drum Cartridge
3.7.1 Major functions
- Drum Cartridge (PL4.1.21)
Drum Cartridge carries out a series of operation in the print process such as charging, and transfer.
Drum Cartridge mainly consists of the following parts.
Developer is an equipment which develops images in the print process.
• Drum (Y) • Developer (Y)
• Drum (M) • Developer (M)
• Drum (C) • Developer (C)
• Drum (K) • Developer (K)
- CRUM
Drum...

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Drum Cartridge
Drum (K)
Drum (C)
Drum (M)
Drum (Y)
Developer (K)
Developer (C)
Developer (M)CRUM
Developer (Y)
Rear view illustration
LED ASSY  ERASE
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3.8 Drive
3.8.1 Major functions
- DRIVE ASSY MAIN (PL7.1.2) (Refer to 6.1 DRIVE ASSY MAIN)
Supplies the drive to parts as follows.
• DRIVE ASSY PH
• TRANSFER ASSY
• CHUTE ASSY FDR REGI
• Drum Cartridge
• DRUM (Y, M, C, K)
- DRIVE ASSY SUB
Supplies the drive to parts as follows.
• FUSER UNIT
• DEVELOPER (YMCK)
DRIVE ASSY  SUBDRIVE ASSY  MAIN
DRIVE ASSY  PH
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Confidential - DRIVE ASSY PH (PL7.1.4)
DRIVE ASSY PH transmits the driving force from the DRIV ASSY SUB (PL7.1.1) to relevant parts.
The transmission channel is changed by the COLOR MODE SWITCHING SOLENOID in the DRIVE 
ASSY PH to allow the driving force of the DRIVE ASSY MAIN (PL7.1.2) to reach the Black Devel-
oper only.
This is performed to ensure that the Yellow, Magenta, and Cyan Developers cannot be rotated by 
the DRIVE...

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MiS06027KA
MAGNET ROLL (K)DRIVE ASSY  SUB
DRIVE ASSY  PH Sub Motor
GEAR D2 GEAR D4
GEAR D3 IN
Cutting of drive
Drive from
Sub Motor GEAR D3 OUTCAM C
FLANGE D3
[ BLACK and WHITE MODE ]
COLOR MODE
SWITCHING SENSOR
COLOR MODE
SWITCHING SOLENOIDCAM C
GEAR C 

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3.9 Electrical
3.9.1 Major functions
- FAN (PL8.1.1)
Dissipates heat out of the printer to prevent the printer from overheating.
-SWITCH
The SWITCH turns ON/OFF the AC power supply of the printer.
- Low Voltage Power Supply (LVPS:PL8.2.1)
The LVPS is provided in two types, 120V and 240V.
Supplies AC power from the power source to the Fuser Unit heater and generates and supplies sta-
ble low voltage DC power used for...

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Confidential - WIRELESS ADAPTER (PL8.1.16)
An adapter for enabling the network connectivity of the printer by wireless.
- SIDE COVER SWITCH (PL5.1.9)
SIDE COVER SW is a switch that detects the right side cover open.
FA N
SWITCHPWBA EEPROM
HUMIDITY SENSORLow Voltage Power Supply
High Voltage
Power Supply OPERATOR PANEL
MEMORY
CARD
Electronic Sub SystemMachine
Control Unit
WIRELESS ADAPTER
INTERLOCK SWITCHSIDE COVER SWITCH
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