Lexmark T642 Service Manual - Page 67

Service error codes (9xx.xx) (continued) Error code Sub codes Display text 949 .00 Delay line calibration failure Description System board 950 .00 NVRAM mismatch 951 .00 952 .00 NV failure:n CRC error has occurred. This is recoverable. 4061-xx0 Action Replace the system board. See "System board and inner shield removal" on page 4-76. Go to "950.00 through 950.29 EPROM mismatch failure" on page 2-77. or go to "950.30 through 950.60 EPROM mismatch failure" on page 2-78. Replace the system board. See "System board and inner shield removal" on page 4-76. Warning: When replacing any one of the following components: • Operator panel assembly (or upper front cover) • System board assembly • Interconnect 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 can not be used in another printer. It must be returned to the manufacturer. Perform POR to clear the error. Diagnostic information 2-27