Lexmark C 540n, Service Manual

Page: 57 / 262

Diagnostic information
2-23
5025-2xx, 4xx
950.xx NVRAM Failure service check
Warning: Replace one of the following components, and perform a POR before replacing a second
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
Warning: Never install and remove components listed above as a method of troubleshooting components.
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.
Bin-full/narrow media sensor service check
Step Questions / actions Yes No
1 Have any updates been made to the firmware? Reload the firmware and try
again.
Go to step 2.
Replace the controller board
with a new, and not
previously installed
controller board. See
“Controller board
removal” on page 4-20
.
2 Did reloading the firmware correct the
problem? Problem resolved. Replace the controller board
with a new, and not
previously installed
controller board. See
“Controller board
removal” on page 4-20
.
Step Questions / actions Yes No
1 Inspect the bin-full/narrow media sensor
located towards the front of the top cover
assembly.
Is the bin-full/ narrowmedia narrow media
sensor dislodged or damaged?
Repair or replace the bin-
full/
narrowmedia narrow
media sensor. See “Bin-
full/narrow media sensor
removal” on page 4-18
.
Go to step 2.
2 Does the flag rotate freely and interrupt the
sensor beam when in normal position? Go to step 3. Reposition or replace the
flag. See
“Bin-full/narrow
media sensor flag and exit
deflector removal” on
page 4-19
.
3 Turn the printer off, and remove the rear
shield. See
“Top cover assembly removal”
on page 4-13 . Turn the printer on, and then
check the values below at JBIN1:
Are the values correct?
Problem resolved. Replace the controller
board. See
“Controller
board removal” on
page 4-20
.
JBIN1
Pin Value
1 0 V dc (+5 V dc during cycle)
2 +3.3 V dc beam blocked
0 V dc unblocked
3 Ground