Ricoh DD 5450, Field Service Manual, Page: 135 / 403

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Chapter 3 Paper Feed Section
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Circuit
Vertical reg. motor
Vertical reg. center sensor
Vertical reg. encoder sensor
Vertical reg. limit sensor
Yellow
Orange
Blue
Green
Red
Blue
Blue
Red
Red
White
Gray
Drive PCB unit
Main PCB unit
Photopassing: 0V
Photointerrupting: 5V
Operation
Top and bottom limit of print position is detected by the vertical registration encoder sensor and the
center sensor. The standard position is detected by the vertical reg. center sensor.
● The vertical registration encoder sensor detects the vertical registration motor rotation.
The main PCB unit controls the number of vertical registration motor rotations with the vertical
registration encoder sensor signal.
Operation with the Power ON
The printing position returns to standard position by operating with the power ON, depending on
the sensor state as follows.
● When positioned between standard position and the bottom limit: Rotate the vertical registration
motor normally (CW) to return the printing position to standard.
● When positioned between standard position and the top limit: Rotate the vertical registration
motor reversely (CCW) to return the printing position to standard.
Photopassing: 0V
Photointerrupting: 5V
REFERENCE
3