Descriptions - Ricoh J-P3 Service Manual

20 February 2004

Descriptions

BCU (Base Engine Control Unit):
The BCU has three CPUs (Main, MUSIC, and DSP). The CPUs control the
following components and processes:
Main CPU
• Engine sequence
• Machine and printer engine operation
• Peripherals
• High voltage supply, laser emission, fusing
• Sensors, drive board, solenoids
• Motors
MUSIC (Mirror Unit for Skew and Interval Correction) CPU
• TD sensor
• Line position adjustment
• Memory chip on the toner cartridge
DSP (Digital Signal Processor)
• Line position adjustment
Controller:
The controller handles the following functions:
• Printer-to-host interface
• Operation panel interface
• USB interface
• Standard network interface
• Optional interfaces (IEEE 1284, IEEE 1394, IEEE 802.11b [Wireless LAN],
Bluetooth)
• HDD, DRAM DIMM
LD Drive Board:
This is the laser diode drive circuit board.
DRB:
The DRB (driver board) controls the paper feed motor, development motors
(color/black), drum drive motors (color/black), transfer unit drive motor, and transfer
voltage.
USB:
Offers simple connectivity for computers, printers, keyboards, and other
peripherals.
6-5
OVERVIEW