Ricoh DD 5450, Руководство по обслуживанию на месте, Страница: 142 / 403

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Chapter 3 Drum Driving Section
CN2-28
-29
-30
(1) Drum position-1 Sensor
2. Functions of Parts
Description
The drum position-1 sensor detects the drum removal position and the master detachment position.
When the drum removal button is pressed, the drum rotates and stops with a bleep at the drum
removal position.
:Drum removal button
● You do not have to hold down the drum removal button.
(Hold it down when the master ejection box is open.)
Circuit
Drum position-1 sensor
Blue
gray
Red
Main PCB unit
Photopassing: 0V
Photointerrupting: 5V
Operation
The illustration below shows the status of the drum position-1 sensor during the drum rotation.
● The drum removal position is detected on the drum removal detect edge.
● The master detachment position is the position where the drum rotates by a certain angle from
the master pre-detachment position.
Drum position-1 sensor
Drum removal detect edge
Master pre-detachment
position edge
Drum gear
4
REFERENCE