Ricoh G179 Service Manual page 398

Board Structure
IEEE1284 (Centronics)
IEEE802.11a/g, g (Wireless LAN)
Gigabit Ethernet Board
IOB (Input/Output Board):
The IOB uses the new eI0 chips and handles the following functions.
Drive control for the sensors, motors, and solenoids of the main unit
PWM control for the high voltage supply board
Serial interface with peripherals
Fusing control
Paper feed control
The IOB is located behind the rear covers for easy access. The same IOB is used for all
models but the DIP switches must be set correctly for each model. (
Supply)
LDB (Laser Drive Board):
Holds the laser diodes. The board and diodes are controlled by the GAVD Type-R mounted
on the BCU not the LDB itself.
MB (Mother Board):
Interfaces the BCU with controller. The operation panel connects directly to the Mother
Board.
OPU (Operation Panel Unit):
Controls the LCD user interface and button controls.
PSU (Power Supply Unit):
The improved PSU on this machine consumes less than 1 W when the machine is in the
energy save (low power) mode.
HVPS (High Voltage Power Supply)
Supplies high voltage to the drum charge roller, development roller, and transfer belt.
Duplex
Provides the system interface for all electronic components, i.e. sensors, switches, motors,
and solenoids for the duplex unit.
G179
CÓPIA NÃO CONTROLADA
6-6
CÓPIA NÃO CONTROLADA
High Voltage Power
SM