13-4.Paper Level Detection Mechanism - Minolta Di450 Service Manual

13-4. Paper Level Detection Mechanism
The amount of paper still available for use, or the paper level, of the drawer is detected by
the Lift-Up Motor Pulse Sensor and a pulse disk. They function to detect the speed of the
Lift-Up Motor.
When the drawer is slid in
During a copy cycle
Lift-Up Motor Pulse Sensor
1st Drawer: PC12
2nd Drawer: PC13
PC12 (1st Drawer)
PC13 (2nd Drawer)
The number of pulses generated is counted for the
period of time until the Lift-Up Sensor is blocked.
The number of pulses is translated to the amount of
paper which is indicated on the control panel.
The number of pulses generated is counted for the
period of time until the Lift-Up Sensor is blocked.
The number of pulses is cumulatively counted and the
total count is translated to the amount of paper.
The unit segment of the paper level indicator on the
Lift-Up Motor
1st Drawer: M11
2nd Drawer: M12
Pulse Disk
1134M020AA
CONTROL SIGNAL
PWB-A PJ3A-11A
PWB-A PJ3A-11B
M-50
The Lift-Up Motor is energized.
Paper is consumed.
The Lift-Up Motor is energized.
control panel goes out.
Paper level Indicator
• 1 to 50 sheets
• 50 to 200 sheets
• 200 to 350 sheets
• 350 to 500 sheets
• 500 sheets up
Blocked Unblocked WIRING DIAGRAM
H L
H L
1134M058AA
1134M059AA
1134M060AA
1134M061AA
1134M062AA
27 - E
27 - E