Question about Apple Computers & Internet
There are 4 pins in a trapezoid arrangement. The two that are farthest apart go to case ground. The other two do not. What are they? Both +28V? One +28V, one -28V? One +14V and one -14V? (The unit is rated at 28VDC out). If you can help, please make sure to tell me, looking at the plug, which pin has what voltage. Thanks.
Any power supply with the same pins will do. Just choose a good brand and with same rating or better higher(400 watts or more).
Posted on Sep 15, 2008
Most USB hubs do not need an external power supply, except when a connected USB device draws more power than the computer/laptop USB port can supply. In this case an external power supply will need to be connected to the USB hub.
Normally this would be a 5 volt power supply, but make sure the polarity on the connector matches the power connector on the hub, check the label on the hub, sometimes it states to power requirements of the hub as well as the polarity on the connector. Normally the pin on the hub's power connector is positive (ie. +5V)
Posted on Nov 13, 2008
Sounds like it's not grounding properly. Safest thing to do would be to replace the power supply. Hope this helps.
Posted on Dec 27, 2008
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