Read Sharp MX-DEX8 / MX-DEX9 Service Manual online
MX-DEX8/DEX9 OPERATIONAL DESCRIPTIONS 4 – 3
6. Paper level detection
A. Paper level detection
The paper feeder detects the amount of paper remaining in the tray as one of four levels (100%, 67%, 33.3%, and zero), and displays the level
it has detected.
it has detected.
B. Detection Method
The paper feeder determines the remaining paper level based on how many times the paper level sensor turns ON during the time between the
start of the lift-up of the paper feed tray and the activation (turning ON) of the upper limit sensor.
start of the lift-up of the paper feed tray and the activation (turning ON) of the upper limit sensor.
Paper absence sensor detects
when there is no paper remaining.
when there is no paper remaining.
1/3 range
Sensor: logical Low
Sensor: logical Low
2/3 range
Sensor: logical High
Sensor: logical High
3/3 range
Sensor: logical Low
Sensor: logical Low
When there is no paper
Paper level 1/3 position
Paper level 2/3 position
Paper level 3/3 position
Rotary panel
DPED
(Paper presence sensor)
Actuator for detecting the
amount of remaining paper
amount of remaining paper
DCSPD
(Paper level sensor)
(Paper level sensor)
(State transition chart: How the paper level sensor state changes according to the amount of paper actually remaining during tray lift-up)
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