Brother MFC-760, Service Manual

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2.3 Sensors and Actuators
This equipment has the following sensors and thermistor.
Sensor name Type Located on
Document front sensor
Photosensor Document sensor PCB
Document rear sensor
Cover sensor Photosensor Cover sensor PCB on the scanner base
CCD HP sensor Photosensor Scanner base
Registration sensor
Photosensor Paper width/registration sensor PCB on the
upper paper chute
Paper width sensor
Paper ejection sensor
Photosensor Paper ejection/cassette sensor PCB on the
lower paper chute
Cassette sensor
Ink cartridge sensors Mechanical switches Carriage PCB
Black ink empty sensor Photosensor Carriage PCB
Carriage encoder Photosensor Carriage PCB
Head thermistor Thermistor Carriage PCB
Head property EEPROM

Print head unit (Head PCB)
Purge cam HP switch Mechanical switch Purge cam (
→
Main PCB)
• 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.
• Cover sensor which detects whether the scanner unit is closed.
• CCD HP sensor which detects whether the CCD unit is in the home position.
• Registration sensor which detects the leading and trailing edges of paper, which allows the
controller to determine the registration timing.
• Paper width sensor which detects whether the paper width is A4-size or wider.
• Paper ejection sensor which detects whether the paper goes out of the equipment.
• Cassette sensor which detects whether the paper cassette is loaded.
• Ink cartridge sensors, each of which detects whether an ink cartridge is loaded.
• Black ink empty sensor which detects whether the black ink cartridge is empty.
• Carriage encoder which detects the current carriage position and carriage travel speed. If the
carriage travel speed varies abnormally, the controller regards it as a paper jam.