HP LASERJET ENTERPRISE M725dn Troubleshooting Manual page 173

Table 2-10 Manual sensor tests (continued)
Sensor or switch Sensor
name number
Duplex switchback SR1
sensor
Tray 4 feed sensor SR1
(Optional 500-sheet
feeder only)
Output sensor SR3
ENWW
Replacement part Replacement part
number description
CF235-67913 Duplexer
RM1-9415-000CN Tray 4 paper pick-up
assembly
CF066-67909 Paper delivery
assembly
Paper-path sensor Testing of sensor
test name
SR1 Duplexer Remove the duplexer,
switchback sensor insert a sheet of paper
so that it covers the
switchback sensor, and
then reinstall the
duplexer.
SR1 Tray 4 feed Open the lower right
door, and use a small
flat-blade screwdriver
to activate the sensor.
SR3 Output sensor Open the left door and
press the sensor lever.
Tools for troubleshooting
141