IBM RS/6000 7024 E Series, Руководство по обслуживанию, Страница: 46 / 162

Step 1520-3
Note: Either the power supply, the system board or the start/stop switch is
defective. Check the power supply first.
1. Unplug the power cord from the system. Press and hold the start/stop switch for
a few seconds (to discharge the power supply).
2. Connect the power cord to the system.
3. There is a small black and white cable with a 2-pin connector hanging from the
main power supply. With a small screwdriver or similar tool, short the two pins
together for a few seconds.
Does the system power up while you short the pins? (You will hear the fan and
see the power good LED turn on. When you release the short, the system will
power down).
NO Replace the power supply and go to “Step 1520-5” on page 2-15.
YES Go to “Step 1520-4.”
Step 1520-4
The power supply is working properly.
Ensure that the start/stop switch is securely connected to the system board
connector (J37).
Did you find the problem?
NO Go to “Step 1520-5” on page 2-15.
YES Go to "Map 0410: Repair Checkout" in the IBM RS/6000 Diagnostic
Information for Multiple Bus Systems.
2-14
Service Guide