Service manual

3-2 AlphaServer GS80/160/320 Service Manual
3.1 Troubleshooting During Power-Up
Power problems may occur when powering up the system.
Table 3–1 Power Problems
Symptom Possible Cause Indicators
System does
not power
up and/or
main
blowers off
and/or
nothing on
console
Vaux problems (affects the entire system)
- AC at site not available
- AC input box not plugged in/power cord
faulty (AC input box LEDs not lit)
- AC input box circuit breakers tripped
- AC input box broken
- Power cords from AC input box to power
supplies (48V or PCI) not plugged in or faulty
- Power supplies broken (both PCI and/or
all 48V) (Vaux LEDs off)
- Broken power subrack distribution panel
- Power not getting from subrack distribution
panel to PSMs in QBBs (PSM Vaux LED off)
- Power not getting from QBB backplane to
CSB board in H-switch housing or drawer
- Power not getting to console serial bus node
ID module in PCI box
- Short-circuit protection module tripped,
loose, or fallen off
AC LEDs off
AC LEDs off
AC LEDs off
Power supply
LEDs off
Power supply
LEDs off
None
Vaux LEDs off
on QBB mods
None
Vaux LED off
on ID mod
Message on
console –
MPLL_DCOK
_Timeout