Lexmark CS720 Service Manual page 220

Invalid firmware/controller board service check
Action
Step 1
Update the printer firmware.
Note: Contact the next level of support for the correct firmware
level.
Does the problem remain?
Step 2
Replace the controller board. See
page 357.
Does the problem remain?
Memory failure service check
Action
Step 1
Check the memory module on the controller board for proper
installation and damage, and reseat if necessary.
Is the memory module properly installed and free of damage?
Step 2
Reset the printer.
Does the problem remain?
Step 3
Replace the memory module.
Does the problem remain?
Download emulation cyclic redundancy service check
Action
Step 1
Disable the download emulation, and then program the download
emulation into the firmware card again.
Does the error remain?
Step 2
Replace the firmware card and download the emulation to the new
card.
Does the error remain?
"Controller board removal" on
Diagnostic information
220
Yes No
Go to step 2. The problem is
solved.
Contact the next The problem is
level of support. solved.
Yes No
Go to step 2. Go to step 3.
Go to step 3. The problem is
solved.
Contact the next The problem is
level of support. solved.
Yes No
Go to step 2. The problem is
solved.
Contact the next The problem is
level of support. solved.
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