Toshiba TECRA M5, Maintenance Manual

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2 Troubleshooting Procedures 2.4 System Board Troubleshooting
2-24 [CONFIDENTIAL] TECRA M5 Maintenance Manual (960-542)
Table 2-5 Printer port LED boot mode status (4/9)
LED Status Test item Contents
Expansion memory checksum check
resume error (Resume error LED=76H)
PnP RAM checksum check (Resume
error LED=77H)
Transition to RESUME-MAIN
Resume error process Reset of CPU clock to low
Prohibition of all SMI
Clearance of resume status
Return to ROM
Turning area of C0000h to EFFFFh to PCI
(Prohibition of DRAM)
Setting of resume error request
(03h)
Copying ROM/RAM of system BIOS ( HLT, when error occurs )
04h Security check
05h SMRAM initialization
APIC initialization
WakeUp factor check
SMRAM base rewriting and CPU state
map saving for BIOS
Permission of SMI based on ASMI
06h Initialization of devices which need
initialization before PCI bus initialization.
PIT test (Cold boot only) and initialization
Setting of test pattern to channel 0 of
PIT#0
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.)
HLT, when the time is
out.
Test of PIT channel 2 (Check whether the
speaker gate works normally.)
CPU clock measurement
Check of parameter block A
Permission of SMI except auto-off function
Judging of destination (Japan or except
Japan) based on DMI data