Lexmark C720 Service Manual - Page 85

5024-001 Error Code Action 947 Process Timing Clock Error Go to the "911-Main Motor (MM) Service Check" on page 2-47, for more information. 953 Indicates the NVRAM failed the CRC check. Replace the main engine (MCTL P.W.B.) board. NVRAM Chip Failure 954 Indicates the main engine (MCTL P.W.B.) board NVRAM failed the CRC check. Replace the main NVRAM CRC Failure engine (MCTL P.W.B.) board. 955 Code CRC Error Indicates that the code ROM failed the CRC check. Replace the code overlay SIMM. 955 Font ROM Failure Indicates that the font ROM failed the CRC check. Replace the overlay SIMM. 956 RIP Processor Failure Indicates that there was a microprocessor failure on the RIP controller board. Replace the RIP controller board assembly. 957 RIP ASIC Failure Indicates that there was an ASIC failure on the RIP controller board. Replace the RIP controller board assembly. 958 Indicates that there was an ASIC failure on the RIP controller board. Replace the RIP controller board ASIC - Engine Failure assembly. 959 SRAM Failure Indicates that there was an SRAM failure on the RIP controller board. Replace the RIP controller board assembly. 960 Replace the RIP controller board. Memory RAM (soldered) Error 961 Memory RAM Error Indicates that the DRAM installed in slot 1 on the controller board is defective. Replace the DRAM SIMM. If this does not fix the problem, replace the RIP controller board assembly. Diagnostic Information 2-5