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5. Troubleshooting
3) System Diagnosis
(1) System Diagnosis Card
The working status of the system is displayed by hexadecimal codes on the seven segment during
the post. If the system is working improperly, it is used to test the system is working in the proper way
after replacing the FRU caused system down or diagnosing the causes of the improper working without
taking apart the system.
(2) Debugging Code
If there is something wrong with the system, which can be circuit or parts, the systems working at
a specific code, The following is the debugging code list about the error of the system board.
Code
Beeps
02h
03h
04h
06h
08h
09h
0Ah
0Bh
0Ch
0Eh
0Fh
10h
11h
12h
13h
14h
16h
1-2-2-3
17h
18h
1Ah
1Ch
20h
1-3-1-1
22h
1-3-1-3
24h
26h
28h
29h
2Ah
2Ch
1-3-4-1
2Eh
1-3-4-3
2Fh
30h
1-4-1-1
Verify Real Mode
Disable Non-Maskable Interrupt
Get CPU type
Initialize system hardware
Initialize chipset with initial POST values
Set IN POST flag
Initialize CPU registers
Enable CPU cache
Initialize caches to initial POST values
Initialize I/O component
Initialize the local bus IDE
Initialize Power Management
Load alternate registers with initial POST values
Restore CPU control word during warm boot
Initialize PCI Bus Mastering devices
Initialize keyboard controller
BIOS ROM checksum
Initialize cache before memory auto size
8254 timer initialization
8237 DMA controller initialization
Reset Programmable Interrupt Controller
Test DRAM refresh
Test 8742 Keyboard Controlle
Set ES segment register to 4 GB
Enable A20 line
Auto size DRAM
Initialize POST Memory Manager
Clear 512 KB base RAM
RAM failure on address line xxxx*
RAM failure on data bits xxxx* of low byte of memory bus
Enable cache before system BIOS shadow
RAM failure on data bits xxxx* of high byte of memory bus
POST Routine Description
5- 5
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