2.4 System Board Troubleshooting 2 Troubleshooting Procedures Table 2-3 Printer port LED boot mode status (2/8) LED Status Test item Message
Storing key scan code
Setting of TASK_1ms_TSC
B5H
Display initialization
FAN control
Enabling system speaker
Disabling mute
Sound controller initialization (for
beep)
Setting volume to max
Message display CEC/KBC UPDATE/DAMAGED, BIOS
UPDATE/DAMAGED
Disabling USB
Sound beep
Key input
Waiting for key input
FDC reset
Setting of parameter for 2HD (1.44MB), transmission rate
Reading first sector
Setting of parameter for 2DD (720KB), transmission rate
Search of CHGBIOSA.EXE from route directory
Calculation of directory start head, sector
Reading contents of route directory by one sector
Search of entry for "CHGBIOSA.EXE"/
"CHGFIRMA.EXE", from the sector read
Reading of EXE header of "CHGBIOSA.EXE"/
"CHGFIRMA.EXE" key input when an error occurred
B6H
Reading
CHGBIOSA.EXE/CHGFIRMA.EXE
Execute "CHGBIOSA.EXE"/"CHGFIRMA.EXE"
Prohibition of cache Prohibition of cache B3H
Initialization of special register
00H PIT CH1 initialization (Setting refresh interval to 30ms)
Check of DRAM type and size (at Cold Boot)
(HLT when the DRAM type is 0)
01H
SM-RAM stack area test (HLT when the stack area can not be used.)
Cache configuration
Enabling L1 cache
CMOS access test (at Cold Boot) (HLT when an error is detected.)
Battery level check of CMOS
02H
CMOS checksum check