Toshiba A40 manual UPDATE/DAMAGED, Bios UPDATE/DAMAGED, Beep, FDC Reset, Chgfirma.Exe

2 Troubleshooting Procedures 2.4 System Board Troubleshooting

Table 2-5 Printer port LED status (2/8)

LED Status	Test item	Contents
(B6h)	(BIOS rewrite)	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”
(B3h)	Prohibition of cache	Initialization of special register
00h		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 “30∝s”)

2-24 Satellite A40 Maintenance Manual (960-458)