Dell OptiPlex 780 Setup & Features Manual page 7

Control Lights and Diagnostic Lights (continued)
Inside of computer:
Power supply light
Power
Wattage
Maximum heat dissipation
NOTE:
Heat dissipation is calculated by using the power supply wattage rating.
Voltage
Frequency
Input amperage
NOTE:
See the safety information that shipped with your computer for important
voltage–setting information.
Coin-cell battery
Physical
Height
Width
Depth
Weight
Green — The power supply is turned on and is functional.
The power cable must be connected to the power connector
(at the back of the computer) and the electrical outlet. A test
button and LED are on the top side of the unit.
NOTE:
You can test the health of the power system by pressing
the test button. When the system's power supply voltage is within
specification, the self-test LED lights. If the LED does not light up,
the power supply may be defective. AC power must be connected
during this test.
NOTE:
The test button and indication LED are not accessible
from outside the system. They are located under the removable
side cover on top of the power supply.
180 W
750 BTU/hr
90–264 VAC
47–63 Hz
2.6 A
3V CR2032 lithium coin cell
23.7 cm (9.3 inches)
6.5 cm (2.6 inches)
24.0 cm (9.4 inches)
3.2 kg (7 lbs)