220-801 · Question #515
A technician is about to open a desktop workstation to replace a card. The technician shuts the computer down, opens it, grounds himself to the frame, and begins the task. Which of the following did…
The correct answer is D. Disconnect the power cable. ATX power supplies deliver a 5V standby voltage to the motherboard at all times as long as the power cable is plugged into the wall, even when the computer is powered off. This means the system is never fully de-energized just by pressing the power button. Before working inside…
Question
A technician is about to open a desktop workstation to replace a card. The technician shuts the computer down, opens it, grounds himself to the frame, and begins the task. Which of the following did the technician fail to do?
Options
- APower down the UPS.
- BGround the card to the frame.
- CTurn the power switch off.
- DDisconnect the power cable.
How the community answered
(34 responses)- A3% (1)
- B9% (3)
- C3% (1)
- D85% (29)
Explanation
ATX power supplies deliver a 5V standby voltage to the motherboard at all times as long as the power cable is plugged into the wall, even when the computer is powered off. This means the system is never fully de-energized just by pressing the power button. Before working inside a PC, the technician must physically disconnect the power cable from the outlet or PSU to eliminate any risk of electrical shock or accidental power-on. The technician grounded himself and properly shut down - but forgetting to unplug the power cable (D) left live standby voltage in the system.
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