Supermicro 8042-6, User Manual

Page: 57 / 114

Chapter 5: Advanced Serverboard Setup
5-23
D13-D20
Eight surface-mounted debug LEDs located near the primary IDE connector
(D13-D20) are used to provide POST code information. See the diagrams
below for reading the debug LEDs and refer to Appendix B for a complete
list of POST codes (a partial listing of the most common codes are given
below). The LED closest to the IDE connector (D13) is the low digit.
5-11 Debug LEDs
8
V alue
Reading the Debug LE Ds:
W hen on, each of the eight separate
LE Ds represent the value show n to
the left of it in the diagram . A dd up
the values of the illum inated LE Ds in
D13 to D16 to get the low (right) digit
and those in D17 to D20 to get the
high (left) digit of the corresponding
hexidecim al P OS T code.
E xample:
The exam ple on the left indicates a
hexidecim al P OS T code of C6. This is
determ ined in the follow ing m anner:
D17-D20 (high digit): 8 + 4 = 12
(decim al 12 = hexidecim al C)
D13-D16 (low digit): 4 + 2 = 6
Decimal Hexidecimal Equiv alent
0-9 0-9
10 A
11 B
12 C
13 D
14 E
15 F
= Unillum inated LE D
LE D
D20
= Illum inated LED (1)
D19
D17
D18
D15
D14
D13
D16
1
4
2
8
1
4
2
P rim ary IDE
Connector
Com mon POST Codes:
The following is a list of the most
common PO ST codes that you may see.
POST Code Meaning
01 Displayed while in
BIOS Setup
31 No video card
40 Displayed while
counting memory
83 Displayed when
memory count is
finished
85 CMOS Clear
95 Displayed while
detecting IDE
devices
DE No memory
DE W rong type of
memory installed
DE One memory
module (two
minimum required)