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Lexmark MX521
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Error codes
General troubleshooting guide for 900.00 error code system software errors
Scanning from Scan Center causes 900.00 error
Scan to FTP via Scan Center: 900.70 firmware error
Troubleshooting a 140.80A, 140.82A, 140.83A, or 140.84A service motor error
900 Firmware Error Kernel Crash when the printer is connected to certain networks
84x.xx error
938.04A Service Engine Electronics Error
31.46, 31.66, 655.84 errors and 201.22 paper jam
843.00 or 843.01 scanner error
31.60z Reinstall missing or unresponsive imaging unit
900 error message and scanner is heating up
Fixing a 121.xxA service fuser error
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