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I have purchased local transformer (12v 5amp) but real adapter voltage is (13.5v 6000amp) & sound is not OK so what to do now

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You will just have to try and take it back. You don't have enough voltage and/or amperage to cover the devices needs.

Posted on Mar 24, 2011

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I have a maxtor 120GB external hard drive but no power supply. How do I get a replacement? I tried a switchable power adapter from a local hardware shop and although I set the voltage to 12v it lights up...


Hi Dave.

The problem you are having is the adaptor you tried is the right voltage but not the correct ampage. You require a 12v dc adapter with a rating of at least 1-Amp. The switchable supply you purchased would be well under the required level, probably 400ma (milli-amp), in other words about half the needed amount. A cable modem power adapter would be sufficiant. If you have one, make sure it is the correct voltage and polarity, positive pole (+) usually the inner pin on the end of the connector. Hope this is of some help to you.

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Check the voltages at the input terminals & output terminals of the transformer. If you find voltages at the inputs & no voltages at the outputs, then you have a defective transformer that needs to be replaced.

If the transformer is OK, then start testing the components next to the transformer. There might be a disconnected joint along the circuit path causing the missing volts. You might suspect a failed bridge rectifier section.

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Need charger


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The cost should be no more than fifteen dollars total for adapter and tip, usually the tip comes with the purchase of the transformer, and dont purchase one with a variable voltage, just a fixed voltage if possible you can use 9 or 12 volts but it has to be 1500ma(which is 1.5 amps).

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