Toshiba Satellite A40 Series Maintenance Manual page 80

2 Troubleshooting Procedures
LED Status
(B6h) (BIOS rewrite)
(B3h) Prohibition of cache
00h
2-24
Table 2-5 Printer port LED status (2/8)
Test item
Initialization of special register
2.4 System Board Troubleshooting
Contents
Cancel of sound mute
Setting of volume to max.
Display of messages (EC/KBC
UPDATE/DAMAGED, BIOS UPDATE/DAMAGED)
Key input
Prohibition of USB
BEEP
Waiting for Key input
Reading of CHGBIOSA.EXE/CHGFIRMA.EXE
FDC RESET
Setting of 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.
Calculates the directory start header and sector.
Reads one sector of the root directory.
Retrieval the entry of "CHGBIOSA.EXE" and
"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"
Cache control for Hyper Threading
Prohibition of cache
Initialization of H/W (before DRAM recognition)
Initialization of MCHM
Initialization of ICH4M.D31.Func0
Initialization of ICH4M.D31.Func1
Initialization of USB.Func0,1,2,7
Initialization of ICH4M.D31.Func3
Initialization of ICH4M.D31.Func5
Initialization of FLUTE
Initialization of PIT channel 1 (Setting the refresh
interval "30µs")
Satellite A40 Maintenance Manual (960-458)