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10-8 Ultra Enterprise 6000/5000/4000 Systems Manual—November 1996
10
10.7 Defective Power Supplies
The peripheral power supply and power/cooling modules are hot-pluggable.
Caution – Boards in slots adjacent to a modular power supply may overheat if
the supply is removed and not replaced. The modular power supply provides
cooling air to two board slots.
Caution – Do not hot-plug boards or modules if the peripheral power supply
is defective. The hot-plug feature requires a working peripheral power supply
for precharge current.
Figure 10-7 Diagnosing Power Supply Problems
!
!
INDICATION
Peripheral power supply:
System error message.
Peripheral device or
remote console (TTY A)
fails
Modular power supply:
System error message
Board fails
Begin
End
TEST/PROCEDURE
Examine LEDs, system messages.
Before replacing module, verify:
Green LED off.
Yellow LED may be on.
Before replacing any other hot-
pluggable devices, replace
peripheral power supply first.
Module is ready for replacement if
the Yellow LED is on.
REFERENCE
Table 9-1
Section 7.4.3, “Troubleshooting a
PCM.”
Section 7.4.4, “Replacing a PCM.”