IBM 88371RU, Maintenance And Troubleshooting Manual

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Hot-swap power-supply LED errors
Use the information in this section to solve power-supply problems.
Note: The minimum configuration required for the dc good light to be lit is:
v
Power supply
v
Power cage assembly, if installed.
v
System board (use jumper J40 to bypass the power switch; see
“System-board jumpers” on page 62).
Note: See “System replaceable units” on page 122 to determine which components should be replaced by a field
service technician.
AC good
LED
DC good
LED Description FRU/action
Off Off No power to system or
ac problem.
1. Check ac power to the system.
2. Power supply.
On Off Standby mode or dc
problem.
1. Make sure power backplane is installed correctly.
2. Bypass power control button by placing a jumper momentarily
on jumper block J40 (see “System-board jumpers” on page
62).
Note: Do not allow the jumper to remain on jumper block
J40 for more than three seconds.
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
3. 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.
4. Power backplane.
5. Power cage assembly, if installed.
6. System board.
On On Power is working
properly.
N/A
96
xSeries 336 Type 1879 and Type 8837: Hardware Maintenance Manual and Troubleshooting Guide