Question about Hitachi 12v 3/8" Driver Drill Kit with Flashlight DS12DVF3

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Charger what is the secondary voltage of the transformer on the battery charger?

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Your primary input voltage is of course 110V and the secondary would be anywhere from 14.5 to 15 volt.

Posted on May 23, 2008


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Charger not holding charge, not turning on

You will have to verify that the charger is actually putting out the voltage it is supposed to. The input transformer could still be good while the secondary that goes to the output could be bad or a fuse or other component could be bad in the out put OR the wire from the adapter could be bad. Replace the charger with one that has the correct voltage and amperage ratings and the correct plug on the end.

Aug 04, 2012 | Vector Black And Decker High Frequency...

1 Answer

How to test for bad transformer

  1. To test a transformer you need to know what type of transformer it is first. There is a step up transformer which steps the voltage up and a step down transformer which steps the voltage down.
  2. You will still test the transformers the same way for step up and step down transformers. If it is a step up transformer apply the incoming power to the transformer or plug it up. Now take your multimeter and place it on the AC volt scale and test the voltage if the voltage on the data plate says the transformer should step up to 220 volts and it doesn't then your transformer is bad.
  3. Now repeat the same steps for a step down transformer. Plug up the incoming or primary power and test voltage on the outcoming or secondary side the voltage should step down to the proper value. If you don't read any voltage on the secondary or outgoing side then the transformer is bad.
  4. To read the voltage place the two meter leads on the secondary side, or the side you will plug your equipment into. If the secondary side is an outlet then place the two meter leads into the top two slots in the plug and read voltage. You also want to make sure the incoming power is working as well. Otherwise you will be reading a bad reading every time.

Dec 16, 2011 | Emerson LC320EM8 32 in. LCD TV

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Charger not charging,charging led not lite. Reading approx 3.2Vac out of terminals. On a good charger the reading is 4.8Vac Dewalt Charger ( Model DW9118) 7.2V-14.4V

You can try warranty services. However, if they are having an event in your area you might just try going down there. I have taken bad batteries to them in the past and they just GAVE me a new one.

May 04, 2011 | Dewalt Drills

1 Answer

I have some liebert ups 6kva i have problem in charger circuit i find transistor 13n80 have a short circuit i replace it and replace fuse in charger board 6.3a but there still problem in charging batteries...

Hi, Thanks for contacting fixya. There could be many reasons.

1. The battery is old and completed its charge-discharge cycle.
2. The step down transformer (220/110V to 12/24V) coils got shorted inside.
3. For a trickle charger, the SCR might have gone bad.

Solution for 1. Take out the battery and charge it by another charger. You can use laptop charger, cell phone charger or any charger. You might have to do a little bit circuitry. Then after 2-3 hrs of charging see if the battery voltage goes to its peak. Use a voltmeter or multimeter to measure that. If the voltage does not goes to its peak then battery is faulty. And the charger circuit has no problem.

Solution for 2. Some times step down transformer goes wrong. Measure the output voltage by a multimeter and see if it is giving the voltage what it should be. If not then change the transformer.

Solution for 3. I don't know how to determine if an SCR is wrong. The easiest way to check is to replace it and see if the battery is changing.

Feb 02, 2011 | Liebert GXT210000RT208 10000VA...

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I live in New Zealand which has 240 volt supply on the grid. The zantrex 2000 works with an input supply of 120 volts. How can I use it?

Hi, OK, there are two ways to achieve this. One. Using an external STEP DOWN Transformer, 240 V AC, to 120 V AC. The ONLY thing that matters is KVA. As long as the KVA is the same ir will work. This means as long as the Output Voltage and Current are the same, it's irrelevant whats on the Secondary. So if
The second, is to remove the existing transformer, and substitute with an exactly the same Secondary Outputs, BUT with a 240 V AC,. Input winding. Most likely it is a simple step Down transformer anyway, that steps down, whatever the external voltage is, down to say 12 -18 V AC. Therefor ANY suitable 240 V AC transformer with the SAME secondary winding(s) will work, no problems. You can even get some transformers Overwound, for 240 V AC, a very common thing, depending on transformer construction. There are a few transformer manufacturers in the "Yellow Pages" contact one of them and inquire.
As a tip, sometimes the existing transformer has TWO 120 V windings, and sometimes only ONE side is used, for US power, and for 240 V AC, you simply connect the other winding in series, and NOW you have got your 240 V AC to whatever.

Sep 01, 2010 | Inverter Xantrex MS2000 Sine Wave Charger...

2 Answers

I bought a schumacker sc-200a smart charger a little over a year

I think it can be repaired. May be some capacitor or zener diode.  

Jun 07, 2010 | Schumacher & Fast Charge Starter Charger

1 Answer

I have a Battery Tender 12v 1.25a battery

remember secondary voltage is AC like the primary voltage, only its reduced typically 120vac primary and 12 or 18vac secondary then the ac secondary is rectified using a bridge rectifier to get the 12vdc then a filter circuit is applied to remove any electrical noise.. any way the problem is with the dc voltage side of the circuit and unless you know how to troubleshoot the circuit you will not be able to repair it. my experience says it might be a bad bridge rectifier.

Dec 29, 2009 | Battery Tender Measuring Tools & Sensors

1 Answer

What are the secondary voltages off the transformer supposed to be?

The secondary voltages of a transformer are stepped down voltages. For example a transformer might be stepping 120 volts AC down to 25 volts AC in the secondary. Which then would be rectified by a bridge rectifier in the power supply and converted to DC Voltage which would be used to bias transistors or tubes and other electronic components. The amount of voltage that is output for use is determined and calculated by the engineers designing the amplifier or pre-amp.

Aug 26, 2009 | Audio Players & Recorders

2 Answers

My computer will not turn on. when i plug in cahrger the light comes on but power button not doing anything.

Disconnect the charger and remove the battery. Wait 10 seconds, then reconnect both battery and charger. also, let it charge for 5 minutes before you try the power button again.
Please make sure that you see the power/recharge light on your laptop. Let me know if you need further help.

Jul 27, 2009 | Toshiba Satellite A135-S2276 Notebook

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