2.4 System Board Troubleshooting 2 Troubleshooting Procedures
TECRA M3 Maintenance Manual (960-507) 2-21
Table 2-5 Debug port LED boot mode status (2/7)
LED Status Item Contents/Message
(B7h) Memory type check
Initialization of cache Bus L2 configuration
Permission of cache
Prohibition of L2 cache
Memory clear
Setting of TASK_1ms_TSC
FAN control
Sound controller initialization (for
beep)
Enabling system speaker setting
Reading security status Controlling LED instead of display
massage
Reading policy
(When reading error above is occurred, beep sounds
every one second for thirty seconds)
Key input
(Key input is skipped when the
BIOS is damaged)
Sound beep
FDC reset
Setting of parameter for 2HD (1.44MB), transmission rate
Reading first sector
Reading CHGBIOS.EXE
When using 2HD (1.44MB), go to Search of entry for
CHGBIOSA.EXE
B9h
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" from the sector
read
Reading of EXE header of "CHGBIOSA.EXE" key input
when an error occurred
Execute "CHGBIOSA.EXE"/"CHGFIRMA.EXE"
CHECK_SYSTEM
Prohibition of cache
Initialization of special register and
Intel chipset
00h
PIT CH1 initialization (Setting refresh interval to 30µs)
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