Sun Microsystems Ultra 5, Руководство по обслуживанию

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4-2 Sun Ultra 5 Service Manual • February 2000
4.1 Power-On Failure
This section provides examples of power-on failure symptoms and suggested
actions. Perform the suggested actions until you isolate the problem.
Symptom 1
The system does not power on when you press the keyboard Standby (Power).
Actions
1. Check the keyboard connection to ensure that the keyboard is properly connected
to the system.
2. Check the power cord to ensure that it is properly connected to the system and to
the wall receptacle.
3. Verify that the system power switch is set to on.
4. Verify that the wall receptacle is supplying power to the system.
5. Check the voltage-line select switch to ensure that it is set correctly.
6. Press the front panel standby switch. If the system powers on, the keyboard might
be defective or the system might be unable to accept the keyboard power-on
signal.
7. Power off the system (if necessary) and press the keyboard Standby (Power) key
again. If the system powers on, no further action is required. If the system does
not power on, the CPU module might not be correctly seated.
8. Inspect the CPU module to ensure correct seating.
9. Press the keyboard Standby (Power) key again. If the system powers on, no
further action is required. If the system does not power on, the keyboard might be
defective.
10. Connect a spare Sun Type-5 or Sun I/O Type-6 keyboard to the system and press
the Standby (Power) key.
11. If the system still does not power up, the system power supply might be
defective. See Section 4.4 “Power Supply Test” on page 4-5.