950.Xx Nvram Failure Service Check; Bin-Full/Narrow Media Sensor Service Check - Lexmark C540n Service Manual

5025-2xx, 4xx

950.xx NVRAM Failure service check

Replace one of the following components, and perform a POR before replacing a second
Warning:
component. Never replace both of the components without performing a POR after installing each
one, or the printer will be rendered inoperable:
Operator panel assembly
•
Controller board
•
Never install and remove components listed above as a method of troubleshooting components.
Warning:
Once a component has been installed in a printer, and the printer is powered on, it cannot be
used in another printer. It must be returned to the manufacturer.
This error code indicates a mismatch between the memory on the operator panel assembly and the one on the
controller board.
Step Questions / actions
Have any updates been made to the firmware?
1
Did reloading the firmware correct the
2
problem?

Bin-full/narrow media sensor service check

Step Questions / actions
Inspect the bin-full/narrow media sensor
1
located towards the front of the top cover
assembly.
Is the bin-full/narrowmedianarrow media
sensor dislodged or damaged?
Does the flag rotate freely and interrupt the
2
sensor beam when in normal position?
Turn the printer off, and remove the rear
3
shield. See
"Top cover assembly removal"
4-13. Turn the printer on, and then
on page
check the values below at JBIN1:
Pin Value
0 V dc (+5 V dc during cycle)
1
+3.3 V dc beam blocked
2
0 V dc unblocked
Ground
3
Are the values correct?
Service Manual
2-26
JBIN1
Yes
Reload the firmware and try
again.
Go to step 2.
Problem resolved.
Yes
Repair or replace the bin-
full/narrowmedianarrow
media sensor. See
"Bin-
full/narrow media sensor
removal" on page 4-18.
Go to step 3.
Problem resolved.
No
Replace the controller board
with a new, and not
previously installed
controller board. See
"Controller board
removal" on page 4-20.
Replace the controller board
with a new, and not
previously installed
controller board. See
"Controller board
removal" on page 4-20.
No
Go to step 2.
Reposition or replace the
flag. See
"Bin-full/narrow
media sensor flag and exit
deflector removal" on
page 4-19.
Replace the controller
board. See
"Controller
board removal" on
page 4-20.
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