4-10
UP-895/(E)
4-4-4. Head Up and Down Control
A head up/down DC motor is driven by its driving circuit (IC400). The DC motor can rotate in the
forward and reverse directions. It is controlled by a system control (IC304). The head also has three
positions. The head position is detected using optical head position sensors (photo-interrupters PH21 and
PH22) and read by a system control (IC304).
Operation of head up/down motor
Head motor IC304-28pin IC304-27pin Operation
UP L H Raises the head.
DOWN H L Lowers the head.
STOP H H Stop
Condition of head position sensor
Position IC304-17pin IC304-16pin Condition
TOP H H Unlocks the door.
MIDDLE L H Wait (Usual)
BOTTOM H L Print
4-4-5. Monitor of Door Sensor
The door position is detected using an optical door position sensor (photo-interrupter PH32) and read by a
system control (IC304).
Condition of door position sensor
Position IC304-20pin Condition
CLOSE L The door is closed.
OPEN H The door is open.
4-4-6. Monitor of Paper Sensor
Whether thermosensible paper is properly put in this unit is detected using two pairs of optical paper
sensors (phototransistors PH31 and PH12) and read by a system control (IC304).
Condition of paper sensor
IC304-18pin IC304-19pin Condition
H H Paper exists.
For except “H” For except “H” No paper
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