Lexmark T620 Service Manual - Page 33

4069-5XX/7XX Error Code Action 940 Service LV Power Supply The low voltage power supply zero crossover test failed. • Check the LVPS for correct installation. Ensure that the connector on the LVPS assembly is firmly seated with the connector on the interconnect card connector. • This error can be caused by a noisy AC input power source. • Check to make sure the correct LVPS has been installed. • If all the above are correct, replace the LVPS assembly. 947 PQET Error Indicates that the PQET RAM test was incomplete or a PQET RAM test busy failure occurred. Replace the system board. 948 PEL Clock Error Indicates the PEL clock check failed. Replace the system board. 949 Delay Line Calibration Failure Indicates a delay line calibration failure. Replace the system board. 953 - 954 NVRAM Failure System board failures. 953 NVRAM Chip Failure 954 NVRAM CRC Failure Replace system board. 955 Code CRC Code ROM and NAND failed CRC check * = For a ROM CRC failure, the location (loc) will be a failing block or (Bn). * = For a NAND CRC failure, the location (loc) will be a failing page or (Pn). Replace System Board. 956 - 959 System Board Error codes 956 thru 959 are system board failures. *956 = Processor Failure *957 = ASIC Failure *958 = SRAM Failure For any of these failures, replace the system board. Diagnostic Information 2-5