3-45 Confidential
• The casing internal temperature thermistor monitors the temperature inside the machine. With
this thermistor signal, the controller determines the periodical automatic purge interval since the
casing internal temperature is almost equal to the ambient temperature of ink inside the ink
cartridges.
• The hook switch
* detects whether the handset is on the handset mount.
*For models with handset
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.
Actuator's end
Light-sensitive
transistor
Light-emitting
diode
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