Ricoh D391, Service Manual

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M31 Cover Horizontal Registration Motor
Moves the cover in the cover registration unit to the front or back to position the cover for
binding to the signature.
S20 Cover Path: Sensor 1
Detects the cover in the paper path during transport and spine folding.
S21 Cover Registration Sensor
Detects the cover only during cover gripping.
S22 Cover Guide HP Sensor: Right
Detects home position of the path guide on the right edge of the cover in the cover transport
path.
S23 Cover Guide Open Sensor: Right
Detects when the right cover guide is opened and closed.
S25 Horizontal Path Exit Sensor
Detects the leading and trailing edge of each sheet as it exits the bookbinder during straight-
through feeding.
S26 Cover Path: Sensor 2
Detects the cover in the paper path during exit and spine folding.
S27 Cover Guide HP Sensor: Left
Detects home position of the path guide on the left edge of the cover in the cover transport
path.
S28 Cover Guide Open Sensor: Left
Detects when the left cover guide is open and closed.
S70 Registration Unit HP Sensor
Detects when the cover registration unit is at the home position.
S71 Cover Horizontal Registration Sensor (S)
Detects the rear edge of a small size cover (up to 297 mm) during cover registration in the
cover registration unit.
S72 Cover Horizontal Registration Sensor (L)
Motor, Sensor Locations
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