Xerox 6250N Service Manual - Page 168

POST Diagnostic Test Descriptions Test SDRAM Fault Code 1 I/O ASIC 3 Memory 4 "i" Button (Configuration Chip) 5 Extended Memory 7 EEPROM 10 Ethernet 11 CPU Interrupts 12 USB 13 Real Time Clock 14 RAM DIMM Presence 15 Minimum RAM Limits 16 Maximum RAM Limits 17 IDE Disk 20 Engine Command 22 Engine Fuser Warmup 26 Description (Hard) This test fails if the boot loader finds no RAM present or faulty RAM. (Run prior to POST.) Boot loader posts the message "RAM error" to the front panel and blinks the front panel LED. (Hard) This test determines if the I/O chip is functioning properly and also makes a preliminary check of front panel functionality. (Soft) Checks installed memory above diagnostics code and data addresses. Front panel displays "Memory" if a fault occurs. (Hard) This test checks to see if the "i" button (configuration chip) is present. If no chip is present the test will fail and the front panel message "Please Install "i" button" will display. This test does a write compare test to each 32-bit word in extended memory. (Hard) This test checks addressing of the EEPROM. (Hard) This test checks the ethernet core. (Hard) This test checks that each interrupt source to the CPU is functioning. (Hard) This test checks that the USB core is functioning properly. (Soft) The real time clock is tested. (Soft) This test examines bad or incompatible RAM DIMMs. (Hard) Checks that there is at least 128 Mbytes installed. Front panel displays "Install More RAM" on failure. (Soft) Checks that there is no more than 512 Mbytes installed. (Soft) Checks for presence of hard drive, then checks the disk controller core, and runs a DIAGNOSE command on the hard drive. (Hard) Runs multiple engine commands to verify proper operation. Displays "22:Reseat Controller Board" and "Call Customer Support" on failure. (Soft) Checks for normal fuser operation. Failure will result in a red box on the StartPage with "Hardware Failure". General Troubleshooting 4-7