Toshiba Tecra M1 Maintenance Manual page 81

2.4 System Board Troubleshooting
LED Status
B5H Storing key scan code
Setting of TASK_1ms_TSC
Display initialization
B6H FAN control
Sound controller initialization (for
beep)
Message display
Key input
Reading
CHGBIOSA.EXE/CHGFIRMA.EXE
B3H Prohibition of cache
00H PIT CH1 initialization
01H Check of DRAM type and size
SM-RAM stack area test
02H Cache configuration
Enabling L1 cache
CMOS access test
Battery level check of CMOS
CMOS checksum check
TECRA M1 Maintenance Manual (960 -436)
Table 2-3 Printer port LED boot mode status (2/8)
Test item
2 Troubleshooting Procedures
Message
Enabling system speaker
Disabling mute
Setting volume to max
CEC/KBC UPDATE/DAMAGED, BIOS
UPDATE/DAMAGED
Disabling USB
Sound beep
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
Execute "CHGBIOSA.EXE"/"CHGFIRMA.EXE"
Prohibition of cache
Initialization of special register
(Setting refresh interval to 30ms)
(at Cold Boot)
(HLT when the DRAM type is 0)
(HLT when the stack area can not be used.)
(at Cold Boot) (HLT when an error is detected.)
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