Before opening the unit, disconnect it from the AC outlet and wait for the main capacitor to discharge. Step 2: Testing Standby Voltage Plug in the PSU (do not connect to the motherboard).

The PS-4241-9HA is an certified unit, meaning it achieves over 90% efficiency at typical loads. Input Range : 100–240V AC, 50–60 Hz. Total Output : 240 Watts.