Lexmark MS312 Service Manual page 100

Action
Step 3
Replace the current control panel assembly with the original control panel
assembly. Go to "Control panel assembly removal" on page
Does the error remain?
Step 4
Replace the current controller board assembly with the original controller
board assembly. Go to "Controller board removal" on page
Does the problem continue?
Step 5
Replace the original control panel assembly with a new and not previously
installed control panel assembly.
Does the error continue?
Step 6
Replace the original control panel assembly with a new and not previously
installed control panel door assembly.
Does the error continue?
NVRAM cyclic redundancy service check
Action
POR the printer.
Does the error remain?
Yes
Go to step 5.
192.
Go to step 6.
180.
Contact the next level
of support.
Contact the next level
of support.
Yes
Contact the next level
of support.
Diagnostic information
100
4514
No
The problem is solved.
The problem is solved.
The problem is solved.
The problem is solved.
No
The problem is solved.