Toshiba A20-S259 Maintenance Manual - Page 75

2.12 Sound Troubleshooting 2 Troubleshooting Procedures Table 2-3 Printer port LED boot mode status (3/8) LED Status 00h Test item IRT Check system 01h Memory check 02h CMOS check and initialization 03h Resume branch Message Initialization of special register PIT CH1 initialization size (Setting refresh interval to 30 m/s) Check of the type and size of DRAM (at Cold Boot) The system halts when the DRAM size is zero. SM-RAM stack area test (The system halts when the stack area can not be used.) Cache configuration Enabling L1 cache CMOS access test (at Cold Boot) (the system halts when an error is detected.) Check of CMOS battery level Check of CMOS checksum CMOS data initialization (1) Setting of IRT status (setting boot status and IRT busy flag, the bit remained is zero) Storing DRAM size Resume branch (at Cold Boot) Not resume when a CMOS error is detected Not resume when resume status code is not set Resume error check ICH Power Failure error resume error 7Ah SM-RAM checksum check resume error 73h Check of change of memory configuration resume error 73h System BIOS RAM area checksum check resume error 79h PnP RAM checksum check resume error 77h Transition to resume process Resume error process Reset of the CPU clock to low Disabling all SMI Clearing resume status Return to ROM Setting the area of C0000h to EFFFFh to PCI (Disabling DRAM) Satellite A20 Maintenance Manual (960-444) 2-25