Gestetner A294, Service Manual

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