Paper Jam - Check Bin 1 - Lexmark C750 Service Manual

5060-00x

271 Paper jam - Check Bin 1

Output expander—POST incomplete.
Step Actions and questions
1 Pass thru sensor flag—check the sensor flag for
correct operation.
Is the flag operating correctly?
2 Pass thru sensor cable—make sure the pass thru
sensor cable is correctly connected to J3 on the control
board.
Is the cable connected correctly?
3 Voltage check—disconnect the pass thru sensor cable
from the control board and check the voltage on J3-3.
The voltage measures approximately +5 V dc.
Is the voltage correct?
4 Voltage check—measure the voltage at J3-2. The
voltage measures approximately 0 V dc.
Is the voltage correct?
Output Expander, POST complete—First sheet of paper feeds into Output Bin 1.
Note: Before proceeding with this service check run the Output Bin x Sensor Test and check for the failing
sensor.
Sensor tests:
XNF Near Full (Upper part of sensor assembly)
F Full (Lower part of sensor assembly)
P Pass Thru Sensor
Step Actions and questions
1 DC motor cable connection—make sure the DC motor
connector is correctly installed at J4 on the Output
Expander Option board.
Is the cable installed correctly?
2 DC motor mechanical linkage assembly—check the
resistance of the motor on the cable connector. Check
the resistance between J4-1 and J4-2. The resistance
measures between 115 and 135 ohms.
Is the resistance correct?
3 D.C. motor mechanical linkage assembly—check for
continuity between J4-1 and J4-2 and the case of the
motor. It measures infinity.
Is there continuity between J4-1 or J4-2 and the case
of the motor?
Note: If the motor is shorted from either J4-1 or J4-2
and the case of the motor, it may be necessary to
replace the output expander control board.
2-84
Service Manual
Yes No
Go to step 2 Repair or replace
as necessary
Go to step 3 Reseat the cable
Go to step 4 Replace the control
board
Replace the control Replace the sensor
board assembly
Yes No
Go to step 2 Install the cable
correctly.
Go to step 3 Replace the DC
motor mechanical
linkage assembly.
Replace the DC Go to step 4
motor mechanical
linkage assembly.