System-Board Switches And Jumpers - IBM TotalStorage NAS 300 User Reference

Table 27. Power-supply LED errors (continued)
AC good LED DC good LED
On Off
On On
1
Figure 14. System-board switches and jumpers
Description
Standby mode or dc
problem.
Power is working properly.
1 1
2 2
3 3
1-2 2-3
Disabled Enabled
1
Adapter jumper (J42)
2
Boot block recovery jumper (J28)
3
System board switch block (SW1)
Part/action
1. Check system board cable connectors J4
and J10. Move switch 7 of SW 1 to bypass
power control. If the dc good LED is lit,
press Ctrl+Alt+Delete. Watch the screen for
any POST errors. Check the System Error
Log for any listed problems. If the system
starts with no errors:
a. Power switch assembly
b. System board
2. Remove the adapters and disconnect the
cables and power connectors to all internal
and external devices. Turn on the system.
If the dc good LED is lit, replace the
adapters and devices one at a time until
you isolate the problem.
3. Power supply.
4. Power cage assembly, if installed.
5. System board.
N/A
Appendix D. Symptom-to-part index
1 1
2 2
2
3 3
1-2 2-3
Update Normal
3
147