Toshiba A40 manual LED Status Test item Contents

2.4 System Board Troubleshooting 2 Troubleshooting Procedures

Table 2-5 Printer port LED status (3/8)

LED Status	Test item	Contents
01h	Memory check	DRAM type and size check (at Cold boot)
		If DRAM size is "0", the program halts
		If the SM-RAM stack area test cannot be used as
		stack, the program halts
02h	CMOS check and initialization	Cache configuration
		Permission of cache (L1/L2 cache)
		CMOS access test (at Cold boot only)
		If any error occurred, the program halts
		CMOS battery level check
		CMOS checksum check
		CMOS data initialization (1)
		IRT status setting (Setting of “Boot status” and “IRT
		busy flag” and “0” to the remaining bits)
		Storing of DRAM size
03h	Resume branch check (at Cold	In the case of CMOS error, no resume occurs.
	boot only)
		If “resume status code” is not set, no resume
		occurs
		Resume error check
		ICH Power Failure error Resume error 7AH
		SM-RAM checksum check Resume error 73H
		Memory configuration change check Resume
		error 73H
		Checksum check of system BIOS RAM area
		Resume error 79H
		Checksum check of PnP RAM Resume error 77H
		To resume process (RESUME_MAIN)
		Resume error process
		Returns the CPU clock to “Low”
		Prohibition of all SMI
		Clears resume status
		Returns to ROM

Satellite A40 Maintenance Manual (960-458) 2-25