Lexmark C78x User Manual

2-52 Service Manual
5061
272.xx paper jam service check
5-bin mailbox
5-bin mailbox
POST incomplete
Step Actions and questions Yes No
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?
Fix or replace the
flag.
Go to step 2
2
Bottom pass thru sensor—Make sure the sensor is
correctly connected to J5 on the control board.
Is the sensor connected correctly?
Go to step 3 Reseat the cable.
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?
Go to step 4 Replace the
control board.
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?
Replace the
sensor assembly.
Replace the
control board.
Step Actions and questions Yes No
1 Pass thru sensor flag—Check the sensor flag for
correct operation.
Is the flag operating correctly?
Go to step 2 Repair or replace
as necessary.
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?
Go to step 3 Reseat the cable.
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?
Go to step 4 Replace the
control board.
4
Voltage check—Measure the voltage at J3-2. The
voltage measures approximately 0 V dc.
Is the voltage correct?
Replace the
control board.
Replace the
sensor assembly.

Lexmark C78x Specifications

General

Brand	Lexmark
Model	C78x
Category	Printer
Language	English