Sun Microsystems 6.0005E+11 - Manual (Page 176)

10-2 Ultra Enterprise 6000/5000/4000 Systems Manual—November 1996
10
10.1 No AC or DC Power
Figure 10-1 Diagnosing AC/DC Power Problems
INDICATION
No AC,
fans aren’t turning,
no LEDs
No DC
or yellow LED is lit
System error messages
Begin
End
TEST/PROCEDURE
Check incoming AC power.
Check AC circuit breaker on the AC
sequencer.
Check keyswitch setting.
Check position of the Local/Remote
switch (cabinet server only).
Check system LEDs (front panel or
clock board).
Check modular power supplies.
Check peripheral power supply.
Check CPU/Memory boards.
Check clock board. Operation may
be erratic.
Check LEDs on:
Front panel or clock board
Peripheral PS module
Modular PS modules
CPU/Memory boards
I/O boards
Check /var/adm/messages
REFERENCE
See Section 12.3, “Restarting the
System.”
See Figure 12-2 (cabinet).
See Figure 12-1 (cabinet)
or Figure 12-3 (standalone).
See Figure 12-2 (cabinet)
or Figure 12-4 (standalone).
See Table 9-1.
See Table 9-3.
See Chapter 7, “Power Supplies.”