Ricoh AC104, Service Documentation

Page: 137 / 160

MAIN BOARD
SM 6-7 B173
Detailed
Des
cription
s
6.4 MAIN BOARD
The engine board and the controller board are on the same board. The CPU
functions as the bus controller, I/O, drivers, and PC interface. The main board
sends the current image video data to the LSU. Then the machine manages the
electro photography to let the machine print. It has circuits on the drive motor
(paper feed, pass), clutch drive, pre-transfer lamp drive, current drive, and fan
drive.
The signals from the paper feed jam sensor and paper empty sensor are directly
put to the main board.
Scan image processing: CCD drive signal and scan motor drive signal.
6.4.1 ASIC (CHORUS2)
The 16/32-bit RISC micro controller gives a cost-effective, low power, high
performance micro-controller solution for MFP.
Main function block
• 1.8V internal, 3.3V external (I/O boundary) microprocessor with 4 K Cache
•
Image processor
•
On-chip clock generator with PLL
• Memory & external bank control
•
DMA control (5-channel)
• Interrupt control
•
2-port USB Host /1- port USB device (ver 1.1) interface control
•
Parallel port interface control
• UART (2 Channel)
•
Synchronous serial interface control
• Timer (4 Channel)
•
Watch dog timer
•
Power control: Normal, slow, idle, stop and SL_IDLE mode
• A/D converter (10-bit, 2 Channel)
•
General I/O port control
•
Print head control
•
Carrier motor control
•
Paper motor control
• Toner generator
•
RTC with calendar function
•
S/W assistant function (Rotator)