Lexmark MS71x/MS81x & MX71x/MX81x Product Study Guide Rev 1.3
For Training Purposes Only 11/19/2012
Mirrored NVRAM Components
Controller Board
Control Panel
Warning! Observe all ESD precautions while handling electronic parts.
Warning! When replacing multiple NVRAM components replace ONE component at a time – NEVER
replace both at once.
If the Control Panel and the controller board are being replaced at the same time, replace the parts in this
order to avoid damage to the machine:
1. Replace the controller board first.
Note: Do not replace the new control panel and controller board at the same time!
2. After installing the new controller board, and before installing the new control panel, start the
printer into Diagnostics mode.
3. After the printer has completed startup, turn off the printer and replace the control panel.
Note: If the Control Panel display failed, the printers’ startup cycle is complete when the
driver motor and fans shut down, and the machine is quiet.
4. After installing the new control panel, start the printer into Diagnostics mode, and allow the
printer to go through a complete startup cycle and the display to go to “Ready”.
5. If the problems persist, leave the new Control Panel in the machine, place the old controller
board back in the machine, and start it up. After the machine startup, shut down the machine,
and install the new controller board. After installing the new controller board, restart the
machine, and let it go through the startup cycle.
ADF Skew Adjustment
In case the ADF needs adjustment to correct skew, several procedures are documented in the service
manual to make this correction. They are:
ADF skew adjustment (front side)
ADF skew adjustment (back side)
ADF skew adjustment (deskew roller)
Media squareness check
Print skew correction
Copy skew correction
Service Tips:
If you must use one the components listed above as a method of troubleshooting, boot the printer into Diagnostic
mode only; this will prevent NVRAM from copying to the new component.
If the printer is allowed to boot normally NVRAM will copy to the new component and it cannot be used in another
printer. It must be returned to the manufacturer.
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