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What is the dc input voltage for a 7.5V NTN1171A charger for a MTX838?

I have a MTX838 radio but need to replace the transformer for the charger. I am not sure if the input voltage is 9 or 12 volts dc

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The book list the wall adapter to charger NTN1171 as being part number 2580162R01. The description says 13.8VDC 1.5A AC ADAPTER. When googling the part number, it appears someone is selling one on eBay for around $29.99. Retail from Motorola appears to be $125.

Posted on Sep 30, 2008

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Can all 18volt 5amp makita batteries be charged on either a 240volt or a 110volt charger. Since I charged mine on a 110volt charger the green/ red lights on the charger start flashing bear in mind the...


The charger input voltage should make no difference on the output voltage / current, if they are designed to run on that input particular voltage. A 240 volt charger will not work on 110 volt and vice versa. If in doubt check the output voltage of the charger with a voltmeter. Make sure you are getting around 20 volts dc.

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If you have the skill to determine the transformer input is open, I would expect you have the skill to replace a transformer. Based on this assumption: determine the input voltage (120 vac?), determine the output voltage (14 vac?), determine the power requirements (output voltage times the charging current), find a transformer at www.digikey.com or www.mouser.com or www.newark.com.

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Hi Bart,
You will find there is a specification plate on the rear of the unit.
It should have a rating on it showing the wattage of the unit. This is usually the amount needed to operate all the functions of the boombox.
The wattage is your input voltage multiplied by the current draw in amps. So the amperage is the rated wattage of the unit divided by the input voltage.
Usually all power goes through the transformer, so I would use this input amperage as a guide, and assuming there is no power loss, use the same calculation for the output - you know it is 9 volts, so the wattage going to the unit is the same as the input wattage, so you can calculate the amperage from this.
Transformers usually work on AC input/output, so there will also be a rectifier to convert the AC to DC for your boombox.
I would add 10 - 20% above your calculation to make sure you have sufficient power. Also I suggest that you install a fuse between your transformer and the boombox for safety.

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If you light is charging when you use the 12v automotive charger but not when you use your AC power transformer, my thought is that you might have a problem with your AC charger, not with the light itself. I have AC/DC transformers from the 1970s that still work fine, but I have had numerous modern AC/DC transformers burn out on me in recent years.

One easy test is to use a multimeter to measure the output voltage of your wall charger. Place one test lead on each of the charging terminals (i.e., one inside the barrel and one outside the barrel, if you have a standard coaxial charging port) and check the DC reading. If it's zero--or anything less than 12 volts, actually--the charger isn't working correctly. The problem may be a torn or cut wire or something actually inside the transformer.

Replacement chargers can be found at Radio Shack and other stores. You may also be able to score a cheap replacement at a "dollar plus" store or even at a second-hand shop. Make sure that the terminal polarity is correct on your replacement charger or else you'll fry the batteries in your light.

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  1. Measure the dc output (with multimeter) on female plug. Should read ±16 – 20V DC. If no voltage here open charger and measure 220v AC on input wire before transformer. No voltage faulty input cable or 3pin plug. If ok check for dc voltage after transformer. If transformer faulty (not worth repairing) replace with same dc volts and amp (important)output. Check now output cable.
  2. If voltage is on cable but base does not light up, probable faulty capacitor. If light is on but does not charge, probable rectifier that gives too little amps.
  3. Any good tv repair technician can help you. My tv tech already fix about 9 of my torch and drill chargers. Parts usually about R5 – R10.
ps. email me the specs of your charger the input, output, the current (MA) and the voltage 14.v or 21v to [email protected]

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