Sharp FO 4400 - B/W Laser - All-in-One Service Manual page 55

3. PRINTER ENGINE ELECTRICAL COMPONENTS LAYOUT
PWB-B
4. ELECTRICAL PARTS IDENTIFICATION
Symbol Name
PWB-A Printer PWB unit
PWB-B Power Supply PWB unit
PWB-D Laser Diode Drive PWB unit
(Inside of the Print Head Unit) the laser beam according to the image signals.
PWB-G Toner Empty PWB unit
M1 Main Motor
M3 Polygon Motor
(Inside of the Print Head Unit) direction.
M2 Cooling Fan Motor
H1 Heater Lamp
HV1 High Voltage PWB unit
PE1 Paper Empty Sensor
PS1 Paper Take-Up Sensor
PS3 Paper Exit Sensor
PS4 Paper Out Sensor
PS5A Received Docuent Tray Sensor
PS5B Paper Size Sensor
S2 Interlock Switch
SL1 Paper Take-Up Solenoid
TH1 Thermistor
TS1 Thermostat
TS1
H1
M2
M1
PWB-A
PS1
SL1
Communicates with the control PWB and controls all printer operation.
Converts the power voltage from AC voltage into DC voltage and supplies that to H1.
Detects the start point of printing via the laser diodes and SOS sensor, and illuminates the PC Drum with
Toner quantity is read by the analog signal. (Use of LED)
Provides the drive source for the printer.
A regular heptagon mirror is installed, and rotates at high speed and makes the laser scan in scanning
Exhausts heat from the body.
A halogen lamp that supplies heat to the Fusing Rollers. (600 W)
Supplies power to the following sections:
- Drum Charge Brush: Charged voltage
- Developing Sleeve Roller: Developing bias voltage
- Developing Toner Regulation Plate:
Developing blade voltage
- Developing Toner Collecting Plate: Developing Lower Seal voltage
- Image Transfer Roller: Image transfer voltage
Detects that a sheet of paper is taken up. The signal is L when paper is detected.
Detects that a sheet of paper is taken up. The signal is H when paper is detected.
Detects when the paper is fed out. The signal is H when the paper is detected.
Paper out detection signal. The signal L when the paper is detected.
The signal is L when there is a tray cover.
Detects the size of the paper. Letter: signal H, Legal: signal L.
Detects the opening or closing of the Top Cover. Cuts output voltage (except 5 VDC) when the Top Cover
is open.
Transmits the drive of the Main Motor to the Paper Take-up Roller.
Detects the temperature of the Heat Roller, measures the temperature on the surface of the Heat Roller
and sends to the Heater control circuit.
Cuts power to the Heater Lamp (H1) when overheating (215ºC) is detected at the Fusing Section.
PS3
TH1
S2
HV1
PWB-D
PWB-G
PS5A
Fig. 3
3 – 3
PS4
M3
PE1
PS5B
Function
FO-4400U
FO-CS1