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2 Troubleshooting Procedures 2.4 System Board Troubleshooting
Table 2-5 Printer port LED status (4/8)
LED Status Test item Contents
(03h) Forwards the area of C0000h to EFFFFh to PCI
(prohibition of DRAM)
Sets resume error request
Copying ROM/RAM of system BIOS (HLT when
error occurred)
04h SMRAM initialization SMRAM initialization
CPU supporting Hyper Threading check
Microcode update
WakeUp factor check
Initialization of APIC
SMRAM base rewriting and CPU state map saving
for BIOS
Permission of SMI based on ASMI
05h Initialization of devices PIT test (at Cold boot only) and initialization
which need initialization Setting of test pattern to channel 0 of PIT#0
before PCI bus initialization Check whether the set test pattern can be read
Initialization of PIT channel 0 (Setting of timer
interruption interval to 55ms)
Initialization of PIT channel 2(Setting of the
sound generator frequency to 664Hz)
Test of PIT channel 1 (Check whether the refresh
signal works normally in 30 micro-s refresh interval.)
The system halts when the time is out.
Test of PIT channel 2 (Check whether the
speaker gate works normally.)
CPU clock measurement
Permission of SMI except auto-off function
Battery discharge current control (1CmA)
AC adapter rated over current control
Dividing procedures for time measuring by IRT
Setting for clock generator
Check of parameter block A
CPU Initialization
Microcode update
Geyserville support check
Setting of CPU clock to “high"
Graphics Aperture Size setting
2-26 Satellite A40 Maintenance Manual (960-458)