Dell 2135cn Service Manual page 847

Signal line name
CST FEED CL ON (L)
+24VDC
REGI SENSED (L)
+3.3VDC
PAPER EMPTY SENSED
(H) +3.3VDC
PAPER EMPTY SENSED
(L) +3.3VDC
REGI CL ON (L) +24VDC ON/OFF signal of the CLUTCH ASSY DRV
Version 1 2008.02.01
ON/OFF signal of the SOLENOID FEED
Paper detect signal of the Regi part by the Sensor Photo (REGI SENSOR)
Paper detect signal of the SSF by the Sensor Photo
(SSF NO PAPER SENSOR)
Paper detect signal of the Paper Cassette by the Sensor Photo
(CST NO PAPER SENSOR)
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Chapter 7 Wiring Diagrams and Signal Information
Description