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2.4 System board Troubleshooting 2 Troubleshooting
TECRA M4 Maintenance Manual (960-521) [CONFIDENTIAL] 2-23
Table 2-3 Debug port (Boot mode) error status (2/10)
D port status Inspection items Details
Saving key scan code
Setting TASK_1ms_TSC
Controlling fan
Enabling system speaker
Releasing mute
Initializing sound items (for
BEEP)
Making the volume max
When BIOS, EC/KBC rewriting
is requested
Blinks green (cycle:2s, on:1s, off:1s)
When BIOS ROM is abnormal Blinks orange (cycle:2s, on:1s, off:1s)
When BIOS renewal is
prohibited
Blinks 8 second cycle (On:4s, Off:4s). Beeps
30 second and halts Dport=F1BBh.
Key input Temporary prohibition of USB
Beeps.
Waiting for key input
FDC reset
Setting parameters for 2HD(1.44MB)
Reading of first sector, If it is the data of
1.44MB (2HD), the media type is definite.
Setting of parameters for 2DD (720KB)
Retrieval of “CHGBIOSA.EXE” from the root
directory.
Calculation of directory start head and
sector
Read 1 sector of the root directory
Retrieval of entry of “CHGBIOSA.EXE”
/“CHGFIRMA.EXE” from the sector read.
Reading of EXE header of “CHGBIOSA.EXE”
and “CHGFIRMA.EXE”
Key input when error occurred.
F009h
Reading CHGBIOSA.EXE /
CHGFIRMA.EXE
Execution of “CHGBIOSA.EXE” and
“CHGFIRMA.EXE”
(F007h)
F100h Renewal of micro code (Model
supporting HTT)
Prohibition of cache