Toshiba Tecra M2-S519 Maintenance Manual - Page 77

2.4 System Board Troubleshooting 2 Troubleshooting Procedures Table 2-5 Printer port LED boot mode status (4/7) LED Status 04h 05h 06h Test item BIOS signature check (at Cold Boot) SMRAM initialization Check of Wake Up factor Rewriting of SMRAM base and storing CPU state map for BIOS (Enabling SMI only by ASMI) Initialization of a device which needs initialization before initialization of PCI bus 07h Storing memory configuration in buffer Reading EC version Update of flash ROM type Evaluation of destination (home/overseas) by DMI data Message PIT test (at the Cold Boot) and initialization Setting of test pattern for PIT#0 of CH0 Check whether the test pattern set can be read. Initialization of PIT CH0 (Setting of timer interrupt interval to 55ms) Initialization of PIT CH2 (Setting of sound generator frequency to 664Hz) Test of PIT CH1 (Check whether a refresh signal is working properly when refresh interval is set to 30ms. HLT when the time is out.) Test of PIT CH2 (Check whether the speaker gate is working properly.) Measuring of CPU clock Enabling SMI except for auto-off function Check of parameter block A Control of input voltage over rating Control of battery discharge current Control of AC adapter over current rating Division process of measuring IRT time Setting for clock generator CPU initialization Setting of CPU core frequency Setting of Gsv high and low frequency Check of Geyserville support Setting of CPU clock to high TECRA M2 Maintenance Manual (960-468) 2-23