Gestetner B070 Service Manual page 525

Number
PCB14 Controller
PCB15 LCDC
PCB16 IPU
PCB17 SD Card Board
PCB18 DC Supply Board
PCB19 External Controller Interface Board
Laser Synchronization Detector
PCB20
Board
Power Packs
CGB (Charge, Grid, Bias) Power
PP01
Pack
PP02 Transfer Power Pack
Sensors
S01 Scanner HP Sensor
S02 Original Width Sensors 1~3
S03 Original Length 1
S04 Original Length 2
S05 Drum Potential Sensor
S06 Toner Density Sensor
S07 Image Density (ID) Sensor
S08 Toner Hopper Sensor
S09 Toner Supply Pump Motor Sensor
S10 Upper Toner Bottle Sensor
S11 Lower Toner Bottle
S12 Upper Bottle Inner Cap Sensor
S13 Lower Bottle Inner Cap Motor
S14 Toner Collection Bottle Sensor
SM
CÓPIA NÃO CONTROLADA
ELECTRICAL COMPONENT DESCRIPTIONS
Name
Controls the memory and all peripheral
devices. GW architecture allows the board
to control all applications, i.e. copying,
printing, and scanning. In order to add an
option (printer, scanner), the appropriate
ROM DIMM must be installed on the
controller.
LCDC (LCD Controller): Controls the
operation panel and connects the scanner to
the IPU
IPU (Image Processing Unit): Contains
large-scale integrated circuits that perform
image processing with the digital data sent
from the SBU, then sends the processed
data to the controller and to the exposure
ASIC which sends it to the LD unit. Also
relays data transmissions between the
controller and LCDC.
Allows SD cards to be connected to the
controller.
Converts the DC current supplied from the
PSU to the correct DC voltage for the
operation of the Controller.
Interfaces the controller with the IEEE1394
card and other options
Detects when the laser is about to start
another main scan line across the OPC
Provides high voltage for the charge corona
wires, grid plate, and the development roller.
Supplies high voltages to the transfer unit.
Informs the CPU when the 1st and 2nd
scanners are at home position.
Detect the width of the original.
Detects the original length.
Detects the original length.
Detects the drum surface potential.
Measures the concentration of toner in the
toner-developer mixture.
Detects the density of the ID sensor pattern
on the drum.
Monitors the level of toner in the toner
supply unit.
Detects whether the toner supply pump
motor is rotating.
Detects when the upper toner bottle is set.
Detects when the lower toner bottle is set.
Detects when the inner cap of the upper
toner bottle is opened.
Detects when the inner cap of the lower
toner bottle is opened.
Detects when the waste toner collection
bottle is set.
6-9
CÓPIA NÃO CONTROLADA
Description
B070/B071