Sensors And Actuators - Brother MFC5200C Service Manual

4.2.3 Sensors and Actuators

This machine has the following sensors and thermister.
Document front sensor
Document rear sensor
Document cover open sensor
Scanner open sensor
Registration sensor
Paper width sensor
Manual feed slot cover sensor
CCD HP sensor
Ink empty sensor
Ink cartridge sensors
Carriage encoder
Head thermister
Purge cam HP switch
Pump switching cam HP switch
• 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 cover open sensor which detects whether the document cover is closed.
• Scanner open sensor which detects whether the scanner unit is closed.
• Registration sensor which detects the leading and trailing edges of paper, which allows the
controller to determine the registration timing and check paper jam.
• Paper width sensor which detects whether the paper width is "A4-size or wider" or "narrower
than A4-size."
• Manual feed slot cover sensor which detects whether the manual feed slot cover is closed.
• CCD HP sensor which detects whether the CCD unit is placed in the home position.
• Ink empty sensor which detects at the start of printing whether any of the four ink cartridges is
near empty. According to this sensor signal, the controller may display "NEAR EMPTY XXX"
message.
• Ink cartridge sensors, each of which detects whether an ink cartridge is loaded.
• Carriage encoder which detects the current carriage position and carriage travel speed. If the
carriage travels speed varies abnormally, the controller regards it as a paper jam.
Sensor name Type
Photosensor
Photosensor
Mechanical switch
Photosensor
Photosensor
Photosensor
Mechanical switch
Photosensor
Photosensor
Mechanical switches
Photosensor
Thermister
Mechanical switch
Mechanical switch
4 -1 5
Located on
Document sensor PCB in
the ADF
Document cover
Control panel PCB ASSY
Driver PCB
Driver PCB
ASF
CCD PCB on the CCD unit
Sensor support
Carriage PCB
Purge unit