2-4
Service Manual
Figure 2-2 Troubleshooting: Start with the Operator Control Panel
On/Off
button/ keyswitch
is Off
Yes
Fix problem identified.
Turn power on and watch power-up.
No
As 48-VDC power is passed to the system,
initial tests are run on the CPU, memory,
and I/O adapters on the system. If the system
passes this power-up testing, the green Run and On
LEDs should light. If it does not, look at the console
terminal display to pinpoint the failing module and
replace the module. Repeat . ( If no console
display, the console terminal may be a TGA
(graphics) terminal, connected through a PCI bus.
Connect a character-cell terminal through the serial
port on the system cabinet. Repeat
A
SM22-99
If a faulty component or firmware update
was identified as the problem, replace the
component or update the firmware. If the
problem has not yet been identified, go to
1
2
2
2
2
2
Fault LED
is lit
Some component failed system self-test.
If Run and On are green, Fault is lit, and
system self-tests have completed, replace
any failed component and proceed with
System clock and CPUs are not synchronized.
If Run is off and On is green, Fault is lit, and
system self-test did not complete, check to see if
the system clock and the CPUs have different cycle
times. Replace as appropriate and proceed with
No
Yes
2
3
