Toshiba Satellite A40 Maintenance Manual - Page 84

2.4 System Board Troubleshooting 2 Troubleshooting Procedures Table 2-5 Printer port LED status (3/8) LED Status Test item 01h Memory check 02h CMOS check and initialization 03h Resume branch check (at Cold boot only) Contents DRAM type and size check (at Cold boot) If DRAM size is "0", the program halts If the SM-RAM stack area test cannot be used as stack, the program halts Cache configuration Permission of cache (L1/L2 cache) CMOS access test (at Cold boot only) If any error occurred, the program halts CMOS battery level check CMOS checksum check CMOS data initialization (1) IRT status setting (Setting of "Boot status" and "IRT busy flag" and "0" to the remaining bits) Storing of DRAM size In the case of CMOS error, no resume occurs. If "resume status code" is not set, no resume occurs Resume error check ICH Power Failure error Resume error 7AH SM-RAM checksum check Resume error 73H Memory configuration change check Resume error 73H Checksum check of system BIOS RAM area Resume error 79H Checksum check of PnP RAM Resume error 77H To resume process (RESUME_MAIN) Resume error process Returns the CPU clock to "Low" Prohibition of all SMI Clears resume status Returns to ROM Satellite A40 Maintenance Manual (960-458) 2-25