Description - Ricoh A193 Service Manual

BOARD STRUCTURE

8.2 DESCRIPTION

1. BICU (Base Engine and Image Control Unit)
This is the main board. It controls the following functions:
•
Engine sequence
•
Scanner, laser printer engine
•
Timing control for peripherals
•
Image processing, video control
•
Operation control
•
Corresponding application boards
•
Machine control, system control
2. IOCSS (I/O and Customer Support System Unit)
The IOCSS board handles the following functions:
•
Drive control for the sensors, motors, solenoids of the printer and scanner
•
PWM control for the high voltage control board
•
Serial interfaces with peripherals
•
Circuit for fusing control
3. SBU (Sensor Board Unit)
The SBU deals with the analog signals from the CCD and converts the
analog signals into digital signals.
4. MSU (Memory Super-charger Unit)
The MSU stores and compresses the image data. It also performs the image
editing on the data if requested by the user. An extra 4 MB or 8 MB of
memory can be added (see below).
5. Additional Memory (Option)
This is an additional image memory board for the MSU.
6. LD Unit
This is the laser diode drive circuit board. It controls the laser diode drive
circuit to write the latent image onto the surface of the drum.
7. Mother Board
The printer control board which works in conjunction with the BICU interface
board. It receives the signals from the printer control board and sends signals
to the printer control board.
(A193) 1-16 SM