Dell 4100/180, 4100/200 manual Troubleshooting Power Supply Problems, Replacing a Power Supply

configuration information when the computer is turned off, the battery may be defective.

Follow these steps to troubleshoot the battery:

1.Turn off the system, including any attached peripherals, and disconnect all the AC power cables from their power sources.

2.Remove the left computer cover.

See “Removing the Computer Covers” found earlier in this chapter.

CAUTION: See “Protecting Against Electro- static Discharge” in the safety instructions at the front of this guide.

3.Check the connection of the coin cell battery to the system board.

Is the battery firmly installed in the battery socket on the system board?

Yes. Go to step 5. No. Go to step 4.

4.Reseat the battery in its socket. Is the problem resolved?

Yes. The battery was loose. You have fixed the problem.

No. Go to step 5.

5.Replace the battery.

See “Replacing the Battery” in Chapter 8 for instruc- tions on replacing the battery.

Is the problem resolved?

Yes. The battery’s charge was low. You have fixed the problem.

No. See Chapter 11, “Getting Help,” for instructions on obtaining technical assistance.

Troubleshooting Power Supply Problems

The optional redundant power supplies in Dell Power- Edge 4100 systems are controlled by the power-supply paralleling board. If a power-supply paralleling board is installed, the two light-emitting diodes (LEDs) on the back of the power supply (see Figure 7-6) signal the sta- tus of the power supply. If the red power-supply fault indicator lights up, the power supply should be replaced.

locking

knob

power-supply fault	power-supply online locking switch
indicator	indicator

Figure 7-6. Power Supply Features

Replacing a Power Supply

Follow these steps to replace a power supply:

1.Disconnect the AC power cable from the power outlet, then disconnect the other end of the cable from the power supply.

Open the plastic strain-relief clip and remove the AC power cable.

2.Turn the rotary switch on the power supply to the “off” position, marked by a “0.”

3.Turn the locking knob counterclockwise to release the power supply.

7-8 Dell PowerEdge 4100/180 and 4100/200 Systems Installation and Troubleshooting Guide