Service manual

Samsung Electronics 5-33
5-4-1. PAPER SENSING CIRCUIT
This circuit senses whether there is paper or not, using photo interrupter. If there is no paper, the lever will
cover its sensor and output Ò/P_EXITÓ will become ÒHighÓ. If there is paper, the lever will be lifted and out-
put Ò/P_EXITÓ will become ÒLowÓ.
5-4. OTHERS
Lever
+5V +5V
/P_EXIT
Photo
Interrupter
5-4-2. 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 interrupter is used as a home detecting sensor, attached to the back of
the carriage. When the carriage moves left and right, output is ÒhighÓ if the frame rib covers the center of the
sensor and ÒlowÓ if it is out of home.
Photo
Interrupter
Frame
Rib
+5V
HOME_SEN
Sensor PCB