Toshiba QOSMIO F20 Series, Maintenance Manual

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2.4 System Board Troubleshooting 2 Troubleshooting Procedures
QOSMIO F20 Maintenance Manual (960-526) [CONFIDENTIAL] 2-21
Table 2-4 Debug port (Boot mode) error status (2/9)
D port status Inspection items Details
F004h/F005h Saving key scan code
Setting TASK_1ms_TSC
Controlling fan
Enabling system speaker
Releasing mute
Initializing sound items
(for BEEP)
Making the volume max. (for models whose
volume can be controlled)
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)
Key input Prohibition of USB
BEEP
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.
Reading CHGBIOSA.EXE /
CHGFIRMA.EXE
Execution of “CHGBIOSA.EXE ” and
“CHGFIRMA.EXE ”