![](/images/new-backgrounds/1272369/272369161x1.webp)
2.4 System Board Troubleshooting | 2 Troubleshooting Procedures |
Table
LED Status | Test item | Message |
|
|
|
B5H | Storing key scan code |
|
|
|
|
| Setting of TASK_1ms_TSC |
|
|
|
|
| Display initialization |
|
|
|
|
B6H | FAN control |
|
|
|
|
| Sound controller initialization (for | Enabling system speaker |
| beep) |
|
| Disabling mute | |
|
| |
|
| Setting volume to max |
|
|
|
| Message display | CEC/KBC UPDATE/DAMAGED, BIOS |
|
| UPDATE/DAMAGED |
|
|
|
| Key input | Disabling USB |
|
|
|
|
| Sound beep |
|
|
|
|
| Waiting for key input |
|
|
|
| Reading | FDC reset |
| CHGBIOSA.EXE/CHGFIRMA.EXE |
|
| 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" |
|
|
|
B3H | Prohibition of cache | Prohibition of cache |
|
|
|
|
| Initialization of special register |
|
|
|
00H | PIT CH1 initialization | (Setting refresh interval to 30ms) |
|
|
|
01H | Check of DRAM type and size | (at Cold Boot) |
|
|
|
|
| (HLT when the DRAM type is 0) |
|
|
|
| (HLT when the stack area can not be used .) | |
|
|
|
02H | Cache configuration |
|
|
|
|
| Enabling L1 cache |
|
|
|
|
| CMOS access test | (at Cold Boot) (HLT when an error is detected.) |
|
|
|
| Battery level check of CMOS |
|
|
|
|
| CMOS checksum check |
|
|
|
|
TECRA M1 Maintenance Manual (960 |