Service manual

PagePro 1200 Series General Information
33
3-6. Electrical Parts Function
(1) Printer
Symbol Name Function
H1 Heater Lamp
A halogen lamp that supplies heat to the Fusing
Rollers (600 W)
HV1 High Voltage Unit
Supplies power to the following sections:
- Drum Charge Brush: Charged voltage
- Developing Sleeve Roller: Developing bias volt-
age
- Developing Toner Regulation Plate:
Developing blade voltage
- Developing Toner Collecting Plate: Developing
Lower Seal voltage
- Image Transfer Roller: Image transfer voltage
M1 Main Motor Provides the drive source for the printer.
M2 Cooling Fan Motor Exhausts heat from the body
M3
Polygon Motor
(Inside of the Print Head Unit)
A regular heptagon polygon mirror is installed, and
rotates at high speed and makes the laser scan in
scanning direction.
PE1 Paper Empty Sensor
Detects that a sheet of paper is taken up.
The signal is L when paper is detected.
PS1
Paper Take-up Switch
Detects that a sheet of paper is taken up.
PagePro 1200W:
The signal is L
when paper is
detected.
PagePro 1250E:
The signal is H
when
paper is detected.
PS3 Paper Exit Sensor
Detects when the paper is fed out.
PagePro 1200W:
The signal is L
when paper is
detected.
PagePro 1250E:
The signal is H
when
paper is detected.
PU1 Power Unit
Converts the power voltage from AC voltage into
DC voltage and supplies that to H1.
PWB-P Controller Board
Communicates with the personal computer and con-
trols all printer operation.
PWB-LD2
Laser Diode Drive Board (Inside of the
Print Head Unit)
Detects the start point of printing via the laser diode
and SOS sensor, and illuminates the PC Drum with
the laser beam according to the image signals.
S1 Power Switch Turns ON or OFF the printer.
S2 Interlock switch
Detects the opening or closing of the Top Cover.
Cuts output voltage (except 5 VDC) when the Top
Cover is open.
SL1 Paper Take-up Solenoid
Transmits the drive of the Main Motor to the Paper
Take-up Roller.
TH1 Thermistor
Detects the temperature of the Heat Roller, mea-
sures the temperature on the surface of the Heat
Roller and sends to the Heater control circuit.
TS1 Thermostat
Cuts power to the Heater Lamp (H1) when over-
heating (215°C) is detected at the Fusing Section.