Brother International MFC 9760 Service Manual - Page 40
Sensors and Actuators, Toner sensor LED PCB
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2.3 Sensors and Actuators This machine has 13 sensors: 10 photosensors*, two thermistors, and a mechanical switch as described below. (*Models supporting a 2nd paper cassette have two more photosensors--2nd registration sensor and 2nd cassette sensor.) Sensor name Document front sensor Document rear sensor Document tray open sensor CCD HP sensor Manual insertion sensor Registration sensor Cassette sensor Paper ejection sensor Toner sensor Type Photosensor Photosensor Mechanical switch Photosensor Photosensor Photosensor Photosensor Photosensor Photosensor Cover sensor Jam sensor Heater thermistor In-casing temperature sensor Photosensor Photosensor Thermistor Thermistor Located on Document sensor PCB Document sensor PCB Harness support CCD unit Engine PCB Engine PCB Engine PCB Paper ejection sensor PCB Toner sensor (LED) PCB and toner sensor (light-receiver) PCB Toner sensor (LED) PCB Heat-fixing unit Heat-fixing unit Left-hand plate of the main chassis • Document front sensor which detects the presence of documents. • Document rear sensor which detects the leading and trailing edges of pages to tell the control circuitry when the leading edge of a new page has reached the starting position and when the scan for that page is over. • Document tray open sensor which detects whether the document tray is closed. • CCD HP sensor which detects whether the CCD unit is placed in the home position. • Manual insertion sensor which detects whether paper is inserted manually through the paper slot or whether paper fed through the paper cassette has jammed. • Registration sensor which detects the leading and trailing edges of recording paper, which allows the controller to determine the registration timing and check paper jam. • Cassette sensor which detects whether the paper cassette is loaded. • Paper ejection sensor which detects whether the recording paper goes out of the machine. • Toner sensor which detects whether there is toner or a toner cartridge is loaded. • Cover sensor which detects whether the front cover is closed. • Jam sensor which detects whether paper is jammed inside the heat-fixing unit. • Heater thermistor which allows the controller to monitor the temperature of the heater roller of the fixing unit. • In-casing temperature sensor which allows the controller to monitor the temperature inside the machine. III - 10