Toshiba satellite A20 series Maintenance Manual page 74

2 Troubleshooting Procedures
LED Status Test item
(B3h)
B5h Display initialization
B6h Second controller
initialization
2-24
Table 2-3 Printer port LED boot mode status (2/8)
2.12 Sound Troubleshooting
Message
DRAM configuration
Enable L1 cache
Memory clear
Transition to real mode, coping BIOS on RAM
Storing key scan code
Setting TASK_1ms_TSC
Display initialization
FAN control
Sound controller initialization (for beep)
Enabling system speaker
Disabling mute
Setting the volume to max
Display of message (EC/KBC UPDATE/DAMAGED,
BIOS UPDATE/DAMAGED)
Key input
Disabling USB
Sound beep
Waiting for key input
Reading "CHGBIOSA.EXE"/"CHGFIRMA.EXE"
FDC reset
Setting parameters for 2DD (720KB), setting
transmission rate
Reading the first sector (For 2HD (1.44MB), the
media is defined.)
Setting parameters for 2SS (720KB), setting
transmission rate
Searching "CHGBIOSA.EXE" from route directory
Working out the head and sector of directory start
Reading the route directory by one sector
Searching the entry of
"CHGBIOSA.EXE"/"CHGFIRM.EXE" from the
sector read.
Key input when an error is detected while reading
the EXE header of "CHGBIOSA.EXE"/
"CHGFIRM.EXE"
Executing "CHGBIOSA.EXE"/ "CHGFIRM.EXE"
Satellite A20 Maintenance Manual (960-444)