Samsung SENS R55 Service Manual page 50

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5. TROUBLESHOOTING
The Diagnostic Card is used to evaluate the cause(s) of any abnormal operations of
the system without disassembling the system or to test the system after the
replacement of the FRU.
2) Debugging Codes
In general, if a fault of a circuit or part is detected during the system test, the syst
em stops with a code. The debugging codes for system board faults are listed below.
CODE Description
02 Check CPU Real Mode Change
03 Disable Non-Maskable Interrupts (NMI)
04 Read the CPU type from the CPU internal
register.
06 Initialize System Hardware (DMA,RTC)
08 Set the default values for the Chipset Register.
09 Set the Port Flag
0A Initialize the CPU Register Initialization
0B Enable the CPU Cache
0C Set the default values for the CPU Cache
Register.
0E Initialize I/O
0F Initialize the Storage Media
10 Initialize the Power Manager
11 Initialize the Register
13 Initialize PCI Bus Master Reset
14 Initialize the Keyboard Controller
16 Check the BIOS ROM Checksum
18 Initialize the 8254 System Timer
1A Initialize the 8237 DMA Controller
20 Check the DRAM Refresh Operation
22 Check the 8427 Keyboard Controller
28 Check the DRAM Memory
SENS R55
Check Item
Check that the CPU is supported/Replace the
board.
Check the BIOS ROM/Check after BIOS update
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