Paper Jam Service Check - Lexmark C77x Service Manual

5061
272.xx paper jam service check
5-bin mailbox
Step Actions and questions
1 Bottom pass thru sensor flag—Make sure the flag is
operating correctly and is not binding, broken, and
there is no interference from the sensor cable.
Is there any problem found with the sensor flag?
2 Bottom pass thru sensor—Make sure the sensor is
correctly connected to J5 on the control board.
Is the sensor connected correctly?
3
Bottom pass thru sensor voltage check 1—Disconnect
the pass thru sensor cable and check the voltage at
J5-3 on the board. The voltage measures
approximately +5 V dc.
Is the voltage correct?
4 Bottom pass thru sensor voltage check 2—Check the
voltage at J5-2 on the board; the voltage measures
approximately 0 V dc.
Is the voltage correct?
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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?
2-50
Service Manual
Yes No
Fix or replace the Go to step 2
flag.
Go to step 3 Reseat the cable.
Go to step 4 Replace the
control board.
Replace the Replace the
sensor assembly. control board.
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 Replace the
control board. sensor assembly.