Samsung SF4500, Service Manual

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Samsung Electronics 6-31
6-5-3 Temp IC Driving Circuit
T E M P IC(DC1621S, Thermometer) mounted on the
sensor card on the back of the carriage is used to re a d
the temperature around ink cartridge.
This IC converts the temperature around IC
package into digital and sends the temperature data
to serial to make it sense the temperature
a round the head. It senses temperature so that the
t e m p e r a t u re of the head can be the optimum when
you print something. The above IC sends data seri-
ally using signal lines(THM_DATA, THM_CLK).
6-5-2. Home Sensing Circuit
This circuit senses whether carriage is at home or
not. This function is carried out when the system is
turned on or when the head is capped. Photo
i n t e r rupter is used as a home detecting sensor, attached to the back of the carriage. When the
carriage moves left and right, output is “high” if the
frame rib covers the center of the sensor and “low” if
it is out of home.