Brother DCP6690CW Service Manual page 107

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Most sensors are photointerrupters consisting of a light-emitting diode and a light-sensitive
transistor as shown below. The only exception is the paper width sensor, which uses reflective
type. The illustration on the next page gives the sensor and actuator locations.
The scanner cover sensor and the ink cartridge cover sensor use a carbon switch that consists of
a carbon on the rubber keypad and a carbon contact printed on the control panel PCB. Opening
the scanner cover or the ink cartridge cover releases the corresponding sensor actuator so that
the actuator is pressed against the rubber keypad by the spring force. Accordingly, the carbon
on the rubber keypad comes into contact with the carbon contact on the control panel PCB. The
conduction results in a voltage level change of the IC port, signaling the cover open.
Actuator's end
Light-emitting
Light-sensitive
diode
transistor
3-53
Confidential

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