Toshiba M500 ST5405 - Satellite - Core 2 Duo 2.13 GHz Maintenance Manual page 66

2 Troubleshooting Procedures
Table 2-4 Debug port (Boot mode) error status (2/10)
D port status
(F007H)
F008H
BTBK_INI_MEM_END
Transition to real mode and copy of
BIOS to RAM
F009H
BTBK_CHG_RAM_BIOS
Saving key scan code
F00AH
BTBK_INI_VGA_END
Controlling fan
Initializing sound items
(for BEEP)
When request BIOS, EC/KBC
rewriting
F00BH
BTBK_CANT_UPDATE_BIOS
When BIOS renewal is prohibited
Key input
Reading CHGBIOSA.EXE /
CHGFIRMA.EXE
2-24 [CONFIDENTIAL]
Inspection items
2.4 System Board Troubleshooting
Details
DRAM configuration
Permission of cache (L1 cache only)
Memory clear
Permission of system speaker
Releasing mute
Making the volume max (model that can control
volume)
Blinks green (cycle:2s, on:1s, off:1s)
Blinks orange (cycle: 2s(On:1s,Off:1s))
Prohibition of USB
BEEP
Waiting for key input
FDC reset
Setting parameters for 2HD(1.44MB)
Reading of first sector, If it is the data of 1.44MB
(2HD), the media type is definite.
Setting of parameters for 2DD (720KB)
Retrieval of "CHGBIOSA.EXE" from the root
directory.
Directory start header and calculates the sector
Read 1 sector of the root directory
Retrieval of entry of "CHGBIOSA.EXE"
/"CHGFIRMA.EXE" from the sector read.
Reading of EXE header of "CHGBIOSA.EXE" and
"CHGFIRMA.EXE" Key input when error occurred
Execution of "CHGBIOSA.EXE" and
"CHGFIRMA.EXE"
PORTÉGÉ M500 Maintenance Manual (960-559)