Question about Samson Servo 120 Amplifier

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Power input switch to 220V?

The back of the amp says that it can be used in the USA at 115V, or in Europe at 230V.
I got it in the USA and i want to use it here in China, where power is 220V.
I changed to the recommended fuse type, but they blow immediately. Is there some kind of switch I can use to run this here at 220V?? I opened the chassis and none is visible.

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This is a bit of a guess, but a lot of "switching" power supplies are capable of using anything from 97 to 230 volts without using a switch to pre-set what you are going to plug them in to. That is a guess about why there is no switch, and if I'm right, it is likely that the capacitors in the power supply are...were...strong enough to survive with American voltage, but 220 is a bit too strong for their age. The repair requires parts and soldering.

I'd like to know the real answer if you eventually get it fixed. Please post it here.

Posted on Jul 23, 2008


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Posted on Jan 02, 2017


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Here in the US, and with more than 20 years experience as a computer tech I would venture to answer that almost any computer should work almost anywhere in the world.
You only need to look at the input voltage and make certain the power supply is set to match the line voltage supplied where you are. Standard electricity in Europe is 115v or 220v @ 50hz and in the US it is 115v (almost universally) or 220v (rarely) @ 60hz. The biggest difference is the ac frequency used but for computer power supplies that is immaterial.
A computer power supply converts the ac input power to regulated and filtered 3.3v, 5v, and 12v dc so the ac frequency does not have any affect on the filtered dc output that actually operates the computer. Almost all power supplies have a voltage selector switch near the power cord plug on the back of the computer to choose 115v or 220v. Newer power supplies are designed to be auto selecting on input voltage so even that manual selection is no longer required.

You likely will need a different power cord since the shape of the prongs on power outlets in Europe is always different than here in the US. If I remember correctly from my time in Europe that even varies by country there.

As long as you keep in mind the possible different voltages and the different prong shape and arrangements for the ac power source your packard bell computer should work well here in the US.

Absolute worst case scenario would be that if the power supply already installed in your PC is extremely low quality and was designed to use only one input voltage then it is possible you may need to replace the power supply with one that is designed to be used anywhere.

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If I am hooking up a used water pump and set for 115v setting just like old one and it squeels load but switch to 220v and it quited done to normal will that work for me okay

good question

where are you a 120v usa {backward nation}
region or a 240v region uk or europe 220v ac

you question is far to vague and not right
its set to 240v and its quiet and 120v it squeels
perhaps thats why the old one gave up ???
if you live in a 240v area and the old one failed when set to 120v
its a feking no brainer
the old pump died because it was set to use the wrong voltage

therfore if you live in a 240v area like say the uk or france europe in general 220-240 then set it too 240v and quiet
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I'm going to take a guess and say you are dropping a 230v motor down to a 115v motor.
If the original motor on your equipment was 3 phase, then you need to change motors.
On the other hand, if the equipment had a 230v single phase and you are switching the motor wires so you can plug the equipment into an available 115v outlet, then I would suggest reconsidering. I would recommend running a 220v service line to your equipment instead. It will save on your electric bill and the motor will last longer. A 115v motor pulls twice as much amperage as the same motor running on 230v. (it may even be too much for the 115v outlet you are planing on using) Your variable rate electric meter will tell your power company to up the rate you pay per kilowatt-hour when you use power at a lower voltage but higher amperage rate.

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If the a10ago's function is a mystery, it will help to understand how it works:
Basically, the contactor has three switches side by side. Where the power comes into the box, there's what looks like a lot of extra screws. That's where the thermal protector is (circuit breaker) that will protect your motor at the proper level designed for the motor. The switch has a spring that holds it open so the motor won't run. But there's an electro magnet that can hold the circuit closed. That magnet is only energized when the switch is closed because even though one of its leads is connected to the hot side of the switch, the other lead is connected past the contactor which has no power when the switch is off.
Your 'START' push button momentarily energizes the coil (or maybe it just overpowers the spring and physically pushes the switch closed). The switch closes and the motor runs and keeps running because the coil is energized. Your 'STOP' button momentarily cuts current to the coil and the switch pops open.
The purpose of this contraption is:
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This is the power supply for your PC, depend on your local country power supply, some country like North US may use 110 V in their daily use electrical stuff and some country like Euro, UK use 240 V.

Your PC power supply is design to suit this 2 type of power input so can be sold everywhere. What u need to do is to make sure your local country power supply voltage and then just switch the input correctly, i think u have done it.

YBC (/\)

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