Samsung FIRENZE2-R, Service Manual

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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 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
0Ah Initialize CPU registers
0Bh Enable CPU cache
0Ch Initialize caches to initial POST values
0Eh Initialize I/O component
0Fh 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
1Ah 8237 DMA controller initialization
1Ch Reset Programmable Interrupt Controller
20h 1-3-1-1 Test DRAM refresh
22h 1-3-1-3 Test 8742 Keyboard Controlle
24h Set ES segment register to 4 GB
26h Enable A20 line
28h Auto size DRAM
29h Initialize POST Memory Manager
2Ah Clear 512 KB base RAM
2Ch 1-3-4-1 RAM failure on address line xxxx*
2Eh 1-3-4-3
RAM failure on data bits xxxx* of low byte of memory bus
2Fh Enable cache before system BIOS shadow
30h 1-4-1-1
RAM failure on data bits xxxx* of high byte of memory bus
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