IBM 8500R - Netfinity - 8681, Hardware Maintenance Manual

Page: 182 / 290

AC LED on/DC LED off:
If the AC LED is on and
the DC LED is off, do the following:
1. Check the Power Control Card LED, then return to
this table. See “Power control card LED” on
page 176).
2. Attempt to start the system and check the DC Good
LEDs.
3. If the Good AC LED on and DC Good LED off
condition does not exist on all power supplies, move
the power supply with the DC Good LED off to one of
the other power supply positions. If the DC Good
LED off condition stays with the power supply,
replace FRUs in the following order:
a. Power supply
b. Power control card
c. Midplane
If the DC Good LED off condition stays with the
power supply position, replace FRUs in the following
order, then go to step 10 on page 175:
a. Power control card
b. Midplane
4. If the condition exists on all the power supplies,
disconnect the AC power from all supplies for 30
seconds, then reconnect AC power and attempt to
start the system. Check the LEDs again. If DC Good
LEDs are lit on all power supplies, continue with
system checkout. If not, continue with step 5.
5. Disconnect the ac power and reduce the system to
the minimum configuration described in the note at
the beginning of this section.
6. Install a jumper on J11 on the I/O Board (see “I/O
board component locations” on page 116).
7. Connect the AC power cord and attempt to start the
system. Check the DC Good LED.
8. If the DC Good LED is on, reinstall the components in
the following order to isolate the failing FRU:
a. I/O Function Card
b. Front Panel (once installed, jumper J11 on the
I/O board is no longer needed).
c. System management adapter
d. All remaining components, one at a time.
9. If the DC Good LED is off, swap power supplies. If
the DC Good LED is still off, replace FRUs in the
following order, then go to step 10 on page 175:
a. Power control card
b. Midplane
Table 15 (Page 2 of 2). Power Supply LED Errors
AC
Good
LED DC
Good
LED Error FRU/Action
On On Power
is OK None
174
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