Xerox DocuColor 12/DCCS50, Service Manual

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10-95 DocuColor 12/DCCS50
Paper Size Sensing
Principles of Operation
Reissue
Paper Size Sensing
The user must manually enter the paper size in Tray 1, and the value is stored in the IOT CPU
NVM. Trays 2 through 4 have a paper Size Sensor Assembly which automatically reads the
paper size loaded in that Tray. These switches are located in the back of the machine where
the trays are slid.
Paper Guides in the trays slide for selecting various papers sizes. As the Paper Guides slide,
camming levelers on the bottom of the tray move a Size Sensor Actuator on the back of the
tray. This Size Sensor Actuator pushes the switches on the Size Sensor Assembly to indicate
what paper is loaded in that tray. The paper tray needs to be inserted all the way into the
machine for the Actuator to engage the Size Sensor switches, activating this paper size sens-
ing feature. Refer to
Figure 1 for Sensor locations.
Figure 1 Paper Size Sensors (Shown Inside the Machine)
The tray Size Sensor Assembly reads the paper size in the tray. This assembly uses four
switches that read high and low conditions, The Size Sensor Actuator pushes different combi-
nations of high/low switch settings which correspond to specific paper sizes and configurations.
Refer to
Table 1 .
Paper Size Sensors
Paper Tray Sensor
Paper Feed Motor
Prefeed Sensor
Nudger Solenoid
Paper Out Sensor
Paper Size Guides
Size Sensor Actuator
Table 1 Paper Size Switch Settings, Trays 2-4
Paper Size & Orientation Tray Size Switch
1 2 3 4
No Tray Present low low low low
11.0x17.0” SEF low low low hi
8.5x14.0” SEF low low hi low
B4 SEF low low hi hi
A3 SEF low hi low low
(TFX Special) SEF low hi low hi
8.5x13.0” SEF low hi hi low
B5 SEF low hi hi hi
A4 SEF hi low low low
(TFX Special) LEF hi low low hi
8.5x11.0” SEF (Letter) hi low hi low
B5 LEF hi low hi hi
A4 LEF hi hi low low
8.5x11.0” LEF (Letter) hi hi low hi
A5 SEF hi hi hi low
8.0x10.0” LEF hi hi hi hi