Full Stack Detection; Functions Of Stacker Media Bin Sensors/Motors - Lexmark X850e Service Manual

7500-XXX

Full stack detection

A full stack is detected when media in the stacker media bin becomes full to prevent media jam or falling of
media to the floor. The stacker media bin can stack up to approximately 3000 sheets.
The media volume in the stacker media bin is detected at every 10% (approximately 300 sheets) and notified to
the Controller.
Furthermore, the stacker media bin can stack up to 200 sets (default) of stapled media.
The stacker media bin can continue to stack media until media volume reaches either of the limits above.
In the mix stacking mode, all the sizes are allowed until a media volume of approximately 300 sheets in the
stacker media bin is detected.
The mix stacking mode indicates one of the following cases:
• A larger (any size of media) sheet of media is stacked on a smaller sheet.
For example: A4LEF (297x210) media is stacked on A4SEF (210x297) media.
Note: When B5LEF (257x182) media is stacked on A4LEF (297x210) media, this is not mix stacking.
• A sheet of media of less than 11 inches is stacked in the stacker
media bin with the Staple Mode changed.
• An operator put a sheet (or sheets) when no media is remaining in the stacker media bin.
(The size and condition of media stacked in the tray are not identified.)
• Media was present in the stacker media bin when power was turned on.
(The size and condition of media stacked in the tray are not identified.)
• The finisher entered the Sleep Mode with mix stacking and then has exited the Sleep Mode.
• The post-processing mode has changed.

Functions of stacker media bin sensors/motors

• Sensor (stacker bin level 1)
—
A light emitter and photo-receiver paired together to detect the height of media in the stacker media bin
—
This sensor is used to control the elevator motor.
—
When blocked by media or the tray, this sensor turns high, deciding that the stacker media bin is above
the reference level.
—
To the contrary, when receiving light, this sensor turns low, deciding that the stacker media bin is below
the reference level.
—
The high to low turning point of the sensor is defined as the reference level.
• Sensor (stacker bin level 2)
—
A light emitter and photo-receiver paired together to detect the height of media in the stacker media bin
(same function as sensor (stacker bin level 1))
—
This sensor is also used to control the elevator motor.
—
When blocked by media or the tray, this sensor turns high, deciding that the stacker media bin is above
the reference level.
—
To the contrary, when receiving light, this sensor turns low, deciding that the stacker media bin is below
the reference level.
• Sensor (stacker bin no media)
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MFP Finisher Service Manual
Top view of finisher tray
Rear
staple
Front
staple