936.Xx, 937.Xx-Transport Motor Service Check; 950.Xx Nvram Failure Service Check - Lexmark C540 Service Manual

5025-2xx, 4xx
936.xx, 937.xx—Transport motor service check
Step Questions / actions
1 Turn the printer off, and remove the rear
shield. See "Rear shield removal" on
page 4-11. Check the cable at JCARB1 for
proper connection to the controller board.
Is the cable properly connected?
2 Turn the printer on, and ten measure the
values of the cable at JCARB1:
Pin
12
13
15
17
Are the values approximately correct?

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.
Step Questions / actions
1 Have any updates been made to the firmware?
2
Did reloading the firmware correct the
problem?
2-26
Service Manual
JCARB1
Value
4 +24 V dc
6 +24 V dc
8 +24 V dc
9 Ground
Ground
+24 V dc
+24 V dc
+24 V dc
Yes
Reconnect the cable.
Replace the main drive gear
assembly. See "Main drive
gear assembly removal"
on page 4-45.
Yes
Reload the firmware and try
again.
Go to step 2.
Problem resolved.
No
Go to step 2.
Replace the controller
board. See "Controller
board removal" on
page 4-19.
No
Replace the controller board
with a new, and not
previously installed
controller board. See
"Controller board
removal" on page 4-19.
Replace the controller board
with a new, and not
previously installed
controller board. See
"Controller board
removal" on page 4-19.