Descriptions - Gestetner B147 Service Manual

Descriptions

BCU (Base Engine Control Unit):
The BCU controls all the mechanical components. The BCU has three CPUs (Main,
MUSIC, and DSP). The CPUs control the following functions:
Main CPU
• Engine sequence
• Engine operation
• Timing for peripherals
• High voltage supply, laser, and fusing
• Sensors, drive board, and 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 connects to the BCU through a PCI bus. The controller handles the
following functions:
• Machine-to-host interface
• Operation panel interface
• Network interface
• Interfacing and control of the optional USB, Bluetooth, IEEE1394,
IEEE802.11b (wireless LAN), HDD, and 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.
IPU:
The Image Processing Unit is a large-scale integrated circuit. This unit processes
digital signals.
SBU:
The Sensor Board Unit has a CCD (charge-coupled device) and an analog-to-
digital conversion circuit.
Operation Panel Board:
Controls the display panel, the LED, and the keypad.
Motherboard:
The motherboard is the main circuit board connecting with the BCU, FCU,
controller, IPU, and main power supply unit.
SM 6-5
OVERVIEW
B147/B149/B190