Sun Microsystems Ultra 1 140 Service Manual page 48

4
4.1 Power On Fails or No Video
4.1.1 Symptom
4.1.2 Action
4.1.3 Symptom
4.1.4 Action
4-2
The system does not power up when the power switch on the keyboard is
pressed.
Check the AC power cord to be sure that it is properly connected to the system
and to the wall outlet. Verify that the wall outlet is supplying AC power to the
system.
Press the power switch at the rear of the system. If the system powers on, the
keyboard may be defective or the system was unable to accept the keyboard
power on signal at that time. Power off the system and press the keyboard
power on switch again. If the system powers on, no further action is required.
If the system does not power on, the keyboard may be defective. Connect a
different Sun Type 5 or Sun Compact-1 keyboard and press the power key.
Note – The Sun Type 4 keyboard does not have a power on key, and will cause
the system to power up as soon as the Type 4 keyboard is connected to the
system. The Type 4 keyboard is not supported on the Sun Ultra 1 system.
If you verified that AC power is being supplied to the system and the system
does not power up, the system's power supply may be defective. See "Power
Supply Test" on page 4-3.
The system attempts to power up, but does not initialize the monitor and does
not boot.
Press the power on switch and observe the keyboard. The lights (LEDs) on the
keyboard should be lit briefly and you should hear a tone from the keyboard.
If you hear no tone or see no lights on the keyboard, the system's power
Sun Ultra 1 Series Service Manual—November 1995