Gestetner B070 Service Manual page 551

SBU (Sensor Board Unit): The SBU receives analog signals from the CCD and
converts them into the digital signals that are used for image processing. A/D
conversion divides the range between black and white into 256 levels and digitizes
the analog signal based on these levels. The 256 levels are called grayscales.
IOB (Input/Output Board): Performs three functions:
• Converts sensor output from the paper bank, toner bank unit, and LCT then
sends it to the BCU.
• Converts serial data from the BCU to parallel data for control of the paper bank,
toner bank unit, and LCT components (motors, solenoids, clutches).
• Supplies the 24V power supply from the PSU to the BCU, LCT, and interlock
system for the development motor, drum motor, and paper feed motor.
LCDC (LCD Control): The LCDC controls the operation panel and relays the
internal signals of the optical system (SBU, MCU!"IPU, BCU)
LDB (LD Board): The LDB controls the laser diodes. It also contains the laser
diodes.
AC Drive Board: The AC drive board controls AC power for the fusing lamps and
the anti-condensation heaters.
MCU (Motor Control Unit): Controls the scanner motor with the commands from
the BCU. Also controls Xenon lamp on/off timing, APS detection, the fan motors,
generation of gate signals, and transmission of serial data.
Lamp Regulator: Controls the Xenon exposure lamp in the flat bed scanner
Operation Panel: Controls the operation panel and LCD display panel.
Operation Switch Board: Switches main power to the machine on/off.
Polygon Mirror Motor Control Board: Controls the polygon motor.
PSU-C (Power Supply Unit-Controller): Supplies DC power for the controller.
PSU-E (Power Supply Unit-Engine): Supplies DC power for the machine.
SM
CÓPIA NÃO CONTROLADA
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CÓPIA NÃO CONTROLADA
BOARD STRUCTURE
B070/B071