Gestetner A294 Service Manual page 46

ELECTRICAL COMPONENT DESCRIPTIONS
Symbol Name
PSU
PCB3
(Power Supply Unit)
IOB
PCB4
(Input/Output Board)
SBU
PCB5
(Sensor Board Unit)
MCU
PCB6
(Motor Control Unit)
PCB7 Lamp Regulator
Polygonal Mirror
PCB8
Motor Control
PCB9 LDB
PCB10 AC Drive
PCB11 Operation Panel
PCB12 Operation Key
Lamps
Exposure Lamp
L1
L2 Fusing Lamp 1
L3 Fusing Lamp 2
L4 Fusing Lamp 3
Quenching
L5
Power Packs
Charge/bias/grid
PP1
PP2 Transfer
Others
Circuit Breaker
CB1
Optics
H1
Anti-Condensation
(option)
Drum (option)
H2
Tray Heater 1
H3
(option)
Tray Heater 2
H4
(option)
HDD
HDD1
HDD
HDD2
NF1 Noise Filter
A294/A295
CÓPIA NÃO CONTROLADA
Provides dc power to the system and ac power to the
fusing lamp and heaters.
Controls the paper feed components.
Contains the CCD, and outputs a video signal to the
SBICU board.
Drives the scanner motor.
Provides dc power to the exposure lamp.
Drives and controls the polygonal mirror motor.
Controls the laser diode.
Drives the ac components.
Controls the components of the operation panel.
Controls the operation switch.
Applies high intensity light to the original for
exposure.
Provides heat to the hot roller.
Provides heat to the hot roller.
Provides heat to the hot roller.
Neutralizes any charge remaining on the drum
surface after cleaning.
Provides high voltage for the charge corona wires,
grid plate, and the development roller.
Provides high voltage for the transfer belt.
Provides back-up high current protection for the
electrical components.
Turns on when the main switch is off to prevent
moisture from forming on the optics.
Turns on when the main switch is off to prevent
moisture from forming around the drum.
Turns on when the main switch is off to keep paper
dry in the paper tray.
Turns on when the main switch is off to keep paper
dry in the paper tray.
Scanned image data is compressed and held here
temporarily.
Scanned image data is compressed and held here
temporarily.
Removes noise from the power line.
1-18
CÓPIA NÃO CONTROLADA
Function
SM