Brother MFC-4820C, Руководство по обслуживанию

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[ 3 ] Structure of an ink cartridge
The illustration below is the sectional view of an ink cartridge. The ink cartridge is a one-use type
that cannot be refilled, as described later. It is, therefore, made of flammable materials that will
produce no noxious materials and contains no metal so that the effects on the environment are
minimized.
Diaphragm
Air
Ink
Tape sealing
Stabilizer
Umbrella valve
Bubble casing
Ink chamber
Ink empty detection mechanism
Shown below is the ink empty detection mechanism. It consists of four ink cartridge sensors
(transparent type) on the ink cartridge sensor PCB and sensor actuators built into the ink
cartridges.
If you insert an ink cartridge filled with ink into the ink slot, the built-in sensor actuator will
interrupt the optical path of the ink cartridge sensor. This state will be interpreted as "ink present."
As ink remaining in the chamber decreases, the diaphragm will also lower. If the diaphragm drops
to a certain level so as to push down the end of the sensor actuator, then the opposite end will pop
up above the optical path of the ink cartridge sensor. This state will be interpreted as "ink empty."
When there is no ink cartridge loaded, it will be also interpreted as "ink empty."
Ink present
Diaphragm Stabilizer
Ink chamber
Sensor actuator
Ink empty
Liquid level dropped.