Question about 3Com (3C16593BN) 24-Port Ethernet Hub

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Supply problem Hi its a hardware problem.power supply is not me or send me diagram of the power supply.

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Re: Supply problem

There's a diagram of the power supply at the bottom of this page:
You can also order a used replacement power supply there.

Posted on Apr 21, 2015

Re: Supply problem

If you could state your problem cleary, you might get a better answer.
What can't your switch do?
Does it power on? Switched come with a power adapter that plugs directly into the wall power, then other end into the back of the switch. If it doesn't come on, suspect internal problems

Posted on Feb 18, 2008

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How to resolve PoE fault hp5400zl

Those switches have a lifetime replacement warranty. Find the number you need on this website:
and have the serial number of the switch handy. have the switch plugged in and running and have a laptop and a console cable ready before you get HP on the phone. If it comes down to being a problem with a part they will either send you the part you need OR the whole switch depending on what the problem is with the switch. Most PoE faults are power supply problems. if your switch has more than one power supply be sure the connect both of them to power as HP POE switches that have more than one power supply, 1 power supply gives power to a certain portion of ports and the other power supply will give power to another portion of the ports. Much good luck!

May 21, 2014 | HP 24-port 10/100/1000 Poe Module For 5400...

1 Answer

The device register 15 volts only and I need 19 to power the computer. I have the Pro Universal Notebook and device power supply. I have a HP laptop.

You have a defective power supply.

Luckily, there is a solution.

At Fry's electronics, BestBuy, and Comp USA, if you bring in the power supply to them they will replace it at no charge.

The only thing you have to do to get it is to ask nicely.

I was told this at all 3 places, they all said pretty much the same thing every time, as long as you are polite and ask nicely, then they will replace it with no problem.

Now, if you go in ther mad, demanding it to be replaced, then they might just tell you to get out of their store, and not replace anything, that, or they might get you a new one, and charge you the 30 bucks that it costs to buy it.

All the stores have an unwritten policy on things like that.

Also, if you have it, check your printer power supply, sometimes they will work if nothing is available.

I hope this helps you out.

Good luck to you, and have a nice day.

Apr 30, 2011 | Ultra Products Ultra U12-40941 X-Pro...

1 Answer

How to repair the dso power supply ? is there a circuit diagram ? thx

repairing a power supply do not need a diagram often faulty on a power supply are the regulator transistor,capacitors,resistors,and diodes. just check these parts and you can fix the power supply.check also for loose contacts and connectors this also cause a fault on the power supply.

Jan 18, 2011 | NetGear ProSafe JFS524 24-Port Ethernet...

1 Answer

4 port HUB is connected. My computer doesn't show it. Help! It is all plugged in with USB cable and when I go to MY COMPUTER it doesn't show.

The hubs usually show up in the hardware list and not as a seperate device. Only way to know it is there is to plug a usb device into it.

I devised these simple steps that tend to remedy quite a few issues with most USB portable / external hard drives and devices (though not always)

A few things to check but assumes USB and Windows for other interfaces / operating systems similar steps may be adapted to suit.

1. Ensure it is connected directly to the computer to a USB 2.0 port not a USB 1.0 port as this can have effects on performance and reliability

2. Use only the cables that came with it NOT one that fits that may have been lying around or is longer. Not all USB cables are equal even though they should be)

3. Do not connect through an external USB HUB unless that hub is USB 2.0 AND has its own power supply.

4. Use ONLY the power supply that came with it if it has an external power supply Don’t use any other unless you know it has both the same voltage and current rating e.g. 12V 500mA anything rated below that would not work properly.

5. Always use the same port for connecting your devices. Some devices do not like being switched about. If switched they may want to install software / drivers again. This can be especialy true if you move a HUB to another port

If you checked and fixed anything there and still have issues then check your hardware from CONTROL PANEL / SYSTEM / HARDWARE.
Any exclamation marks by hardware need fixing before you investigate any further

Sep 05, 2009 | CyberPower CPH420P 4-Port USB Hub

8 Answers

Power supply for Targus 4 hub usb 2

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)

Nov 13, 2008 | Targus PAUH217U 4-Port USB Hub

1 Answer

Cisco 2960 power supply

The Cisco 2960 has a life time warranty. Contact the seller and they should be able to get the switch exchanged at no cost.

Jul 31, 2008 | Cisco Rf Catalyst 2960 24-PORT 10/10

2 Answers

Hardware Problem

Probably a bad power supply. Is it getting through power on self test? Any LEDs illuminated when you power it on? Best way is to first connect a terminal configured at 9600,N,8,1 to the console port and then power it on. If you see it running through self test in a few (10-30) seconds, then it's starting up, watch the screen for any errors. If not, then your power supply is probably shot.

Nov 14, 2007 | Cisco Catalyst 3560-24PS Switch

2 Answers

Accton CheetaHub Power 3016P not working

The built in power supply of the switch will be defective. Please contact any good TV technician since it is a SMPS power supply. The repair procedure is same since TV has a SMPS power supply.

Oct 29, 2007 | Accton CheetaHub Power 3016P (EH3016P)...

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