Ricoh Aficio MP 2550B, Service Manual

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Overview
D372 18 SM
Positioning
The paper sensor [6] detects the paper on the tray. The positioning roller [7] (mounted on a
free-swinging arm) descends and touches the paper. The positioning roller (turning
counterclockwise) and the return roller [8] push the trailing edge of the paper against the
two bottom fences and the mobile fence at [9]. (The mobile fence is centered between the
stationary bottom fences.)
Jogging
The front and side fences move in to align the sheets for stacking.
Stapling
The stapler [10] staples the stack with one or two staples.
Paper Output
The feed-out belt motor switches on, moves the mobile fence forward and rotates the
feed-out belt with the feed-out belt pawls [11]. The mobile fence pushes the stack from
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to
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, then the pawls come around and push the stack out of the finisher. Before the next stack
exits, the edge depressor solenoid [12] switches on and retracts the edge depressors just
before the feed-out belt pawls push the stack out. The two stack edge depressors [13]
lightly push down on the trailing edge of the stack to keep it down against the end fence.
The edge depressors are attached to the paper height sensor, so this action checks if it is
necessary to move the tray up or down.
Tray Operation
The tray lift motor [14] raises and lowers the output tray [15] to keep the tray at the correct
height. The readings of the paper height sensor [16] are used to control the raising and
lowering of the tray with the tray lift motor.
The tray-full sensor [17] located at the bottom of the tray rail at the back of the finisher
switches on after the tray descends to its lowest point. This signals that the tray is full. A
spring-loaded bar [18] and its push-switch also signal tray full if the top of the paper load in
the tray pushes this bar up and trips the switch. (This is a backup device to signal tray full if
the tray-full sensor fails.)