Lexmark T652 Service Manual - Page 150

4062 Error code or message 949.00 Error contents Description/Action Possible repair actions System card failure Delay line calibration failure. Replace the system card assembly. Go to "System card assembly removal (T650, T652, T654, T656)" on page 4-76. 950.xx NVRAM mismatch failure Mismatch between system card EEPROM and operator panel mirror. ".xx" codes: 00-29: mismatch between system and mirror 30-60: mismatch between secure and system Warning: When replacing any of the following components: • Operator panel assembly • System card assembly Only replace one component at a time. Replace the required component and perform a POR before replacing a second component listed above. If this procedure is not followed, the printer will be rendered inoperable. Never replace two or more of the components listed above without a POR after installing each one or the printer will be rendered inoperable. Never install and remove components listed above as a method of troubleshooting components. Once a component has been installed in a machine, it can not be used in another machine. It must be returned to the manufacturer. Go to NVRAM mismatch failure service check. See "NVRAM mismatch failure (950.00 through 950.29) service check" on page 2-155. 952.xx NVRAM failure A recoverable MVRAM Cyclic Redundancy Check (CRC) error occurred. The NVRAM chip has failed on the operator panel door assembly. Power the machine off/on to reset the error condition. Replace the operator panel door assembly. Go to "Operator panel door assembly removal (T650, T652, T654)" on page 4-44. If problem remains, replace the fuser unit assembly. Go to "Fuser unit assembly removal (T650, T652, T654)" on page 4-23. 953.xx NVRAM failure 2-116 Service Manual