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
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
Summary of Contents for UP-895
Page 1: ...VIDEO GRAPHIC PRINTER UP 895 UP 895CE UP 895MD SERVICE MANUAL 1st Edition ...
Page 6: ......
Page 26: ......
Page 52: ......
Page 71: ...10 1 UP 895 E 10 1 2 3 4 5 1 A B C D E F G H Section 10 Schematic Diagrams and Board Layouts ...
Page 82: ......