Lexmark X644E Service Manual - Page 74

7002-xxx Service error codes (9xx.xx) (continued) Error code Sub codes Display text 954 .00 955 .00 Code CRC 956 .00 System board 957 .00 System board 958 .00 Nand failure Description Action Replace the interface card. See "Interface card assembly removal" on page 4-107. Warning: When replacing any one of the following components: • Flatbed interconnect card • System board assembly • Interface 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. Warning: Never install and remove components listed above as a method of troubleshooting components. Once a component has been installed in a printer, it cannot be used in another printer. It must be returned to the manufacturer. CRC failure or ECC code failure on the system board. Replace the system board. See "System board and inner shield removal -models X644e/X646e" on page 4-131. This error indicates a system board processor failure. Replace the system board. See "System board and inner shield removal -models X644e/X646e" on page 4-131. This error indicates a system board processor failure. Replace the system board. See "System board and inner shield removal -models X644e/X646e" on page 4-131. Printer has performed more than 100 "shift and replace" operations as a result of EC bit corrections. Replace the system board. See "System board and inner shield removal -models X644e/X646e" on page 4-131. 2-36 Service Manual