Lexmark T520 Service Manual - Page 34

4520-xxx Error Code Action 956, 957, 959 System Board Error codes 956 thru 959 are system board failures. Perform a power on reset (POR). If this does not fix the problem, replace the system board. *956 = Processor Failure *957 = ASIC Failure *959 = SRAM Failure 958 NAND Failure Before proceeding when a 958 NAND failure is displayed, perform a power on reset (POR) to see if the ECC error correction code can reflash NAND. If this does not fix the problem, replace the system board. 960 RAM Memory Error Indicates a DRAM Memory Error on the controller board. Replace the controller board. 961 RAM in Slot Replace the card in Slot 1. If this does not fix the 1 is Bad. problem, replace the controller board. 962 RAM in Slot Replace the card in Slot 2. If this does not fix the 2 is Bad. problem, replace the controller board. 963 RAM in slot 3 Replace the card in slot 3. If this does not fix the is Bad. problem, replace the controller board. 964 Emulation Error 965 Emulation Error Indicates a failure within the Download Emulation which is programmed into the code overlay card. The specific error is as follows: 964 - Download Emulation CRC Failure. Checksum Failure. 965 - Download Emulation Outdated, The Download Emulation and the controller code are incompatible. Go to the "Disabling Download Emulations" on page 3-5. 2-6 Service Manual