Ricoh B264 Service Manual page 420

BOARD STRUCTURE
SBCU (Scanner and Base engine and Image Control Unit). This is the engine
control board. It controls the following functions.
• Engine sequence
• Timing control for peripherals
• Image processing, video control
• Scanner Motor
Controller. The R2K Controller (05S) controls memory and all peripheral devices.
The NCU (Network Control Unit) and USB 2.0 are built into this control board.
FCU (Facsimile Control Unit). This option controls fax communications and fax
features.
ICIB (Copy Data Security Unit). This option provides copy protection of sensitive
documents. Once a document is copied or printed with an RCPS or other printer
driver that supports this function, the hard copy cannot be copied on a copier that
supports hard copy protection.
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 both the B264 and B265 but the DIP switches must be set correctly for each
model. ( 3.19.3)
LDB (Laser Drive Board). Holds the laser diodes. The board and diodes are
controlled by the GAVD Type-R mounted on the BICU not the LDB itself.
MB (Mother Board). Interfaces the BICU with controller and the optional FCU.
OPU (Operation Panel Unit). Controls operation panel and display.
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.
SBU (Sensor Board Unit). Receives analog signals from the CCD (now encased
in plastic, not ceramic) and converts them into digital signals.
SIB (Scanner Interface Board). Controls the scanner, and serves as the signal I/F
board for the SBU and the OPU. The SIB passes signals between the BICU and
the scanner unit components, and transmits video signals from the SBU to the
BICU.
B264/B265 6-6 SM