Technical data

Overview and Updates
SCC LED Codes
The SCC LED codes represent continued power-on and extended self-test testing. If an
error occurs during this testing sequence, a hexadecimal code appears with FRU and error
code information on the monitor screen.
If the system does not enter console mode (>>>) or if hex code DD is not displayed on the
LEDs, use Tables 1-8 and 1-9 to isolate the failed FRU.
Table 1-8 SCC LED Codes
LED Hex Solution 1 Solution 2 Solution 3
Display Code
o•oooooo
40
∗
o•ooooo•
41
∗
o•oooo•o
42 1 5

o•oooo••
43 2 5

o•ooo•oo
44 1 5

o•ooo•o•
45 1 5

o•ooo••o
46 1 5

o•ooo•••
47 4 7
5∗∗
o•oo•ooo
48 3 6 5
o•oo•oo•
49 Reserved

o•oo•o•o
4A Reserved

o•oo•o••
4B Reserved

o•oo••oo
4C Reserved

o•oo••o•
4D Reserved

o•oo•••o
4E Reserved

o•oo••••
4F
∗
∗
Informational only
−
never fails here.
∗∗
If replacing the I/O module fixes the system, then try reinstalling the
original keyboard.
1-12