Paper Jam Service Check - Lexmark C77x Service Manual

271.xx paper jam service check
Output bin
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 ohms and 135 ohms.
Is the resistance correct?
3
DC 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.
4 Output expander board—Disconnect the motor cable
from J4, and check the voltages at J4 on the board.
Note: All voltages are approximate values:
J4—Motor cable (motor idle)
J4-1
J4-2
J4-5
J4-6
Warning: Be careful not to short to adjacent pins on
the connector.
Are the voltages correct?
+24 V dc
+24 V dc
+5 V dc
+5 V dc
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.
Replace the DC Replace the
motor output expander
mechanical control board.
linkage
assembly.
Diagnostic information
5061
2-49