Toshiba Satellite A40 Series Maintenance Manual page 81

2.4 System Board Troubleshooting
LED Status
01h Memory check
02h CMOS check and initialization
03h Resume branch check (at Cold
boot only)
Satellite A40 Maintenance Manual (960-458)
Table 2-5 Printer port LED status (3/8)
Test item
2 Troubleshooting Procedures
Contents
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
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
In the case of CMOS error, no resume occurs.
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
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