4-5
3) S
ystem Diagnosis
(1) S
ystem Diagnostics Card
The Diagnostics Card shows the system operations during the
P
OST
(
Power On Self Test) in
a
2
digit hexadecimal number by connecting the cable to the
10
pin connector below the PCMCIA slot
after separating the Top part
.
Thecardisusedtoevaluatethereasonforthemalfunctionwithout
disassembling the system when the system malfunctions and to test if the system operates normally
after replacing
a
defective FRU.
(2)
Debugging Code
In general, if
a
defect of the circuit or part is detected during the system test, the system stops at
a
particular code
.
The error codes for each part of the system are listed in the following table
.
Code Beeps POST Routine Description
02h
Verify Real Mode
03h
Disable Non-Maskable Interrupt
04h
Get CPU type
06h
Initialize system hardware
08h
Initialize chipset with initial POST values
09h
Set IN POST flag
0
Ah Initialize CPU registers
0
Bh Enable CPU cache
0
Ch Initialize caches to initial POST values
0
Eh Initialize I/O component
0
Fh Initialize the local bus IDE
10h
Initialize Power Management
11h
Load alternate registers with initial POST values
12h
Restore CPU control word during warm boot
13h
Initialize PCI Bus Mastering devices
14h
Initialize keyboard controller
16h 1-2-2-3
BIOS ROM checksum
17h
Initialize cache before memory auto size
18h 8254
timer initialization
1
Ah
8237
DMA controller initialization
-
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-
4.
Troubleshooting
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