Sharp FO 4400 Service Manual - Page 55

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