Service manual

124 Diagnostic LEDs Definitions
Table D–1 (Cont.) Diagnostic LEDs Definitions
State Substate Definitions Recommendations
0000 xxxx Attempting to boot the
system. Once control passes
to VMB, the state LEDs
have no meaning.
System is booting.
Figure D–1 shows the LEDs on the back of the system box.
State
Substate
LJ-00734-TI0
Figure D–1 LED Layout
D.1 Additional LED Information
When the system does not power up successfully or if the diagnostics find
an error, the eight LEDs on the back of the system box usually indicate
the failing device (the system takes 2 to 5 minutes to complete power-up
initialization and testing). However, if the four state LEDs indicate 1111
(F in hexadecimal) through 1010 (A in hexadecimal, the substate LEDs
offer no help in determining the failing FRU. You must disconnect a FRU
as described in each step in the following procedure until the system does
power up normally. Once the system does power-up normally, the last
FRU you disconnected is the failing FRU. Replace the failing FRU and
retest the system for any further problems.
1. Power down the system. Remove the system box cover, disconnect
the cable connecting the system module to the MSC module, and
disconnect the power cables to the drives. This disconnects the MSC
module and all of the drives from the system.
2. Power up the system with the MSC module disconnected. If the
system still does not power up properly, the problem is not with the
drives or the MSC module, then proceed to step 3. If the system does
power-up successfully after disconnecting the MSC module, replace
the MSC module and retest the system.