Ricoh B003 Service Manual page 288

BOARD STRUCTURE
3. IOB (Input/Output Board)
The IOB 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
4. PFB (Paper Feed Control Board)
Controls paper feed.
5. 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.
6. OPU (Operation Panel Unit)
Controls operation panel and display.
7. SBU (Sensor Board Unit)
Receives analog signals from the CCD and converts them into digital signals.
8. LDDR (Laser Diode Driver)
The LD driver circuit board.
9. MDB (Motor Drive Board)
Controls the scanner motor.
10. Mother Board
This board interfaces the controller and the BICU and FCU.
11. FCU (Facsimile Control Unit)
Controls fax communications and fax features.
B003/B004/B06/B007
CÓPIA NÃO CONTROLADA
6-6
CÓPIA NÃO CONTROLADA
SM