Sensors - Brother CB200 Service Manual

2.2.3

Sensors

This machine has three sensors--PE/cover sensor (photosensor), thermistor in the thermal
recording head, and left-hand CIS unit acting as a home position detector of the copyboard screen.
The PE/cover sensor is located on the PE/cover sensor PCB secured to the recorder frame. It
detects whether the recording paper is present or the paper compartment cover is closed.
The thermistor in the recording head allows the controller to monitor the temperature of the head.
According to the change of the thermistor's internal resistance monitored, the controller manages
the duty cycle of the head drive current.
The left-hand CIS works as a home position detector of the copyboard screen also. If it detects
either of the two black HP marks pasted on the copyboard screen, it recognizes that the screen is
in the home position.
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