Toshiba A20-S259 Maintenance Manual - Page 76

2 Troubleshooting Procedures 2.12 Sound Troubleshooting Table 2-3 Printer port LED boot mode status (4/8) LED Status (03h) Test item 04h SMRAM initialization 05h CPU initialization Message Setting resume error request System BIOS ROM to RAM copy (The system halts when an error is detected.) SMRAM initialization Check of Wake Up factor SMRAM base rewrite and BIOS CPU state map store Enabling SMI by ASMI Initialization of devices that needs initialization before PCCI Bus initialization PIT test (at Cold Boot) and initialization of PIT Setting test pattern for PIT#0 CH0 Check whether the test pattern set can be read PIT CH0 initialization (setting tim er interrupt internal to 55m/s) PIT CH2 initialization (setting the frequency for sound generator to 55 m/s) PIT CH1 test (Check whether the refresh signal is working properly when the refresh interval is 30m/s. The system halts when the time is out.) PIT CH2 test (Check whether the speaker gate is working properly.) Measuring of CPU clock Enabling SMI except for auto-off function Battery discharge current control (ICmA) Executing division proves for measuring IRT time Setting of clock generator Check of parameter block A CPU initialization Micro code update Check of Geyserville support Setting CPU clock to high Setting of Graphics Aperture Size 2-26 Satellite A20 Maintenance Manual (960-444)