Brother MFC4820C Service Manual page 74

(Sensor PCB on the ASF)
Registration sensor
Registration sensor
actuator
(Handset)
Hook switch actuator*
Hook switch*
(Hook switch PCB)*
Air pump motor encoder sensor
* Not provided on the MFC100.
PF encoder disk
In-casing temperature
thermistor
(Control panel PCB)
(Ink slot cover)
CR encoder strip
CR encoder sensor
PF encoder sensor
Location of Sensors and Actuators
ASF switch
Scanner/ink slot cover open sensor
Scanner open sensor actuator
Ink slot cover open sensor actuator
(Engine unit)
Paper width sensor (Media sensor)
4 -3 3
(Purge unit)
Purge cam HP switch
(Ink cartridge
sensor PCB)
Ink cartridge
sensors
Head thermistor