System Diagnosis - Samsung OSLO R70 Series Service Manual

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4. Troubleshooting

3) System Diagnosis

(1) System Diagnostics Card
The Diagnostics Card shows the system operations during the POST (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. The card is used to evaluate the reason for the malfunction without
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
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
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