Duplex Option Service Check - Lexmark C750 Service Manual

5060-00x

Duplex option service check

Before proceeding with this service check:
1.
Check for any pieces of media or obstructions in the duplex paper path that might cause a paper jam.
2.
Check for correct installation of the front duplex jam tray and right side clearance tray.
3.
Check the duplex option for any signs of loose, damaged, contaminated, or warped parts that might cause
a jam.
Duplex not recognized as being installed
Step Action and questions
1 Is Duplex option the only option installed beneath the
base printer?
2 Except for the duplex option, remove any other paper
options installed beneath the base printer.
Does the printer recognize the duplex option as being
installed?
3 Make sure the duplex option is correctly installed.
Is the duplex option installed correctly?
4 Make sure the bottom options cable connector is
snapped firmly into the bottom of the base machine.
Is the cable connector mounted correctly?
5 Make sure the options cable is installed correctly to
engine board connector J5.
Is the cable installed correctly?
6 Check the voltages on connector J5 on the engine
board. The voltages are measured with the printer in
standby mode:
Note: All voltages are approximate values.
Connector pin Voltage
J5-1
J5-3
J5-5
J5-6
J5-8
Are the voltages correct?
2-120
Service Manual
+24 V dc
+5 V dc
+5 V dc
+5 V dc
+5 V dc
Yes No
Go to step 3 Go to step 2
The problem is in Go to step 3
one of the option(s)
that is installed
beneath the printer.
Try to isolate which
of the options is
causing the
problem.
Go to step 4 Install the duplex
option correctly
Go to step 5 Install the cable
correctly
Go to step 6 Install the cable
correctly
Go to step 7 Replace the engine
board. See
"Engine board
removal" on
page 4-29.