Lexmark W820 Service Manual page 258

BD1 I/O PWB↔DUPLEX PWB↔DUPLEX COMPONENTS
The following table shows the signal names for this BD:
Signal Name Description
OPT$TX+ Status of Duplex Unit sent to MCU. High=Mark. Low=No mark
OPT#RX+ Status of MCU sent to the Duplex Unit. High=Mark. Low=No mark
DUP#DET Monitors presence of a Duplex Unit. High=Duplex Unit not installed. Low=Duplex Unit
installed
DREGI Monitors paper at the Registration Sensor. High=Paper present. Low=Paper not
present
INV SW Monitors paper at the Fuser Exit Sensor. High=Actuated. Low=No actuated
CL#ICW Switches the Inverter CW Clutch. High=Off. Low=On
CL#ICCW Switches the Inverter CCW Clutch. High=Off. Low=On
INTLK#DUP Monitors the Duplex Cover Interlock Switch. High=Cover Open. Low=Cover closed
SNR$DEXIT Monitors paper at the Duplex Exit Sensor. High=Not actuated. Low=Actuated
SNR$DWAIT Monitors paper at the Duplex Wait Sensor. High=Not actuated. Low=Actuated
CL$DWAIT Switches the Wait Roll. High=On. Low=Off
SOL$DGATE Switches the Duplex Exit Gate Solenoid. High=Off. Low=On
/A, A, /B, B Pulse signals sent by the Duplex PWB to rotate the Duplex Motor
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