IBM 8681 Hardware Maintenance Manual - Page 182

Table 15 (Page 2 of 2). Power Supply LED Errors AC Good LED DC Good LED Error FRU/Action On On Power None is OK 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 174 Netfinity Server HMM