Paper Size Sensing - Xerox DocuColor 12/DCCS50 Service Manual

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.
Paper Size Sensors
Paper Tray Sensor
Nudger Solenoid
Paper Feed Motor
Prefeed Sensor
Figure 1 Paper Size Sensors (Shown Inside the Machine)
Reissue
DocuColor 12/DCCS50
Size Sensor Actuator
Paper Size Guides
Paper Out Sensor
1/05
10-95
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.
Table 1 Paper Size Switch Settings, Trays 2-4
Paper Size & Orientation
1
No Tray Present low
11.0x17.0" SEF low
8.5x14.0" SEF low
B4 SEF low
A3 SEF low
(TFX Special) SEF low
8.5x13.0" SEF low
B5 SEF low
A4 SEF hi
(TFX Special) LEF hi
8.5x11.0" SEF (Letter) hi
B5 LEF hi
A4 LEF hi
8.5x11.0" LEF (Letter) hi
A5 SEF hi
8.0x10.0" LEF hi
Tray Size Switch
2 3 4
low low low
low low hi
low hi low
low hi hi
hi low low
hi low hi
hi hi low
hi hi hi
low low low
low low hi
low hi low
low hi hi
hi low low
hi low hi
hi hi low
hi hi hi
Principles of Operation
Paper Size Sensing