Question about Emerson MS9700 CD Shelf System

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MS9700 secondary voltage

I need change the voltage transformer, it is burned, but i just don't know the outpout voltage

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I am working on the same situation. DId you first check to see if it isn't the fuse that has blown? Radio Shack has a 4 pack of 2 amp fuses for $2.49 which I think will work. Their catalog number is 270-1064. These as 5x20mm in size (the 1-1/4 x 1/4 inch is way to large) and they are slow blow - designed for this type of household equipment to protect from short circuits and power surges. If you are lucky maybe it is just the fuse. Since I can find no other information about this unit - especially the transformer - I'd check eBay for a working one. If you can get it cheal and it works test the power output with a VoltOhmMeter (VOM) and once armed with the info you can let me know too what the output is . You can then get a new transformer - have 2 working units - can keep or sell one to recoupe your eBay purchase. Just a thought. Hope it is only the fuse.

Posted on Dec 08, 2005

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This product is designed to operate on normal 120V 60Hz AC only.

Posted on Nov 20, 2005

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1 Answer

I install a new limit switch and now something keep burning out the transformer i replace it also and something keep burning it out what the problem could be


All transformer comes with a current limit specification in terms of VA units. For example a 24 v secondary coil with 6 VA specification only can hold a current of of 4 amps for a short period of time. So to prevent that it burned out you only pass an 80% of that current, then it really can hold 3.2 amps continuously.
Other possibles causes for burning the transformer are:
1. Accidentally connecting the primary and secondary reversed, the secondary can not manage the voltage and current of the primary .
2. A coil or device that is connected to the secondary is demanding to much current because is shorted or stuck in a position causing an increase on current.
3. The primary have multiple taps to operate on different voltages and the combination is wrong.
3. Faulty wiring. Some times the insulation of the wires became worm, cracked or melted, with the wires torches the metal a short is produced and the transformer burns. Check the wires carefully.

Hope these tips help,.

Jan 08, 2016 | Heating & Cooling

1 Answer

I have a new heater with diferant terminals from the old one so not sure how to atach the wires


There is no need to rewire the internal of the heater!
Just bring in the electrical supply to the heater, it can be either 120 or 240 volts.
If the heater you have is like the picture associated with your post, then all then have to do is change the supplied plug from 240 to 120. It comes pre set for 240. That plug is inside the cabinet.

If any other brand, then you need to change the wires at the transformer of the heater. All heaters need to be supplied with primary voltage: 120 or 240. Then the control system is supplied with secondary voltage out of the transformer. The secondary voltage is no more than 28 volts. and these wires are normally colored as blue or yellow.

Secondary power is already wired within the heater. NO need to change where they are. You will only need to deal with the Primary wiring.

There are many varieties of transformers that transform high primary voltage to a low secondary voltage of 28 volts. and these transformers have many wires: primary & secondary.
I will try to make this easy to understand.

If you have a Gas Heater Transformer with these colors:
  • Red
  • Black
  • White
  • Green
Or...
  • Red
  • White with Red Stripe
  • Black
  • White with Black Stripe
  • Green
These are Dual Voltage Transformers, you can bring in either 120 Volts or 240 Volts

If you bring in only 120 Volts...
1st example:
The Red wire will not be used! Hot wire to the Black, and the Neutral/Common, to the white wire. Green to ground.

2nd example:
Connect the Red wire with the White with Red Stripe together and connect these to the incoming Neutral/Common wire, normally White.
Connect the Black Wire with the White with Black Stripe to your incoming Hot Wire, which is normally Black.
Green to ground

If you bring in 240 Volts...
1st example.
1 Hot wire to the Red, the Other Hot wire to the Black, and White wire is not used. Green to ground

2nd Example:
Wire nut the two Striped wires together. then one incoming Hot wire to the Black, the other incoming Hot wire to Red.
Green to ground

Or This is only a Low voltage - 120 Volts Only
  • Black
  • White
  • Green
Or either any of these combinations...
  • 2 Blacks w/Green
  • 2 Reds w/Green
  • 1 Black, 1 Red w/green
This type will only be a high voltage, 240 volts only
Picture below is what a transformer looks like and it is where your incoming supply wires go. The smaller leads with the spade connections will go to a specific location & is the 'Secondary" .

Good Luck



25568369-di2jpn2pb5nzkrgf0hzbmyq5-3-0.jpg

Mar 14, 2015 | Pool & Spa

1 Answer

I need to know the outpout voltage of my numark ttusb power transformer


the usb output is off course 5 volt. Your phono output you can measure with a reasonable meter, depends on the needle and your line output is something you really need to know , since it's a constant , just like usb which has four leads. Two with a constant voltage 0-5. and the other two are for data transport.

Jan 02, 2015 | Audio Players & Recorders

1 Answer

I want to know what is the secondary voltage of transformer inside PC control panel ?


You have not mentioned the details of the machine in question. All you need is to check on the LT ( low voltage side ) of the transformer to find the secondary voltage which will be about 20 to 30 % less than the DC voltage shown on the capacitor on the board. If there are more windings then you can get the primary rewound without any changes to the secondary that must help to solve.

Jan 14, 2013 | Washing Machines

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

1 Answer

I have a LG LRE30453SW Electric Range and the relay pcb keeps going bad. I get an F7 error when starting the oven. The first time I noticed the black line in, from the power terminal, to the relay pcb was...


First, check the 220v line and breakers are properly grounded and that you are getting a constant 220v at the plug. Then you will need to check the transformer on the unit.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.
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.
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.
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.
If all that looks good, then you will need to replace the control board. Here is a link to the parts for your range.
Regards,Richard

Dec 08, 2011 | Ovens

1 Answer

I have power to the range but the oven was not working


High voltage circuit .......be careful Don't. work until you know how to use multimeter Never try to check the secondary volage across the transformer.its very risky Just check the primary voltage at the transformer if you know how to do it otherwise just leave it If you know how to use multimeter then let me know Thanks Please rate me

Aug 28, 2011 | Smeg Ovens

1 Answer

How to identify the matching transformer terminal by means of terminal resistance? and which terminals is for input or output?


Doing a resistance test on a transformer will not give the information you require as you will read very little, if any resistance. What you need to do is an impedance check and that gets involved. If it is a normally wound transformer, not an auto transformer, you can isolate which is the primary and the secondary windings. Unless the transformer is a multi voltage input unit, the primary side will have continuity through only two terminals. The secondary could be more than two if it is a multi output voltage one. If the transformer is a step down, the primary windings will be the thinner wired windings and vice-versa. To actually test the transformer, get hold of a transformer with about a 20 vac output and try it across the two terminals you have identified as the primary windings, you should ge a proportional voltage of the actual output. eg. with 20 vac input and a 2 vac reading at the secondary, the actual output would be 11 vac if your mains voltage is 110 volts. Take care that you are using the transformer at the voltage it is designed for, otherwise it will overheat and burn out.

May 11, 2011 | Kitchen Ranges

1 Answer

My transformer is burned.Now I need to know what the secundairy voltages are


Transformers USUALLY don't get burned as they are usually protected by a fuse. This one supposedly uses a 3 amp fuse which should have protected it from getting burned. If you can find a schematic or if you can find the specs on the output amp power supplies we can probably calculate the voltage of secondary. We know only that it is supposedly 120 Watts and uses an 8 ohm speaker. The RMS voltage should be about square-root 120*8 = sqrt 960 = 31V*1.4 = approx 44 volts peak... so you will need to get about +/-45 volts out of the supply for headroom... which will need approximately 34 volts AC given diode drop and droop of filter caps. These are really rough educated calculations from the tiny bit of info we have.
Finding a transformer to replace this matching these requirements will be near impossible without getting device from the original manufacturer OR having your rewound.
I would first verify the transformer is bad (only plausible cause is somebody over-fused it or a winding shorted)... Remove all the secondary loads. Put a 3 amp fuse in AND put a 60 Watt light bulb in series with teh power cord to act as a limiting device to test the transformer... Note that transformers DO have a bit of odor as they are usually impregnated with a varnish...

Jan 11, 2011 | Hartke Kickback 12 Bass Amp Warehouse...

1 Answer

Hello, I need to replace my furnace control board #HH84AA015. I found the replacement part fairly quickly. Also found a bad transformer,#HTO1BC115 (primary winding indicates 'open' with ohm meter,...


Hello,The transformer (breaks) if the secondary is shorted for any reason.Also a power surge to the house/building will kill it (lighting strike/car hitting telephone pole).It might cause damage to the board.It is cheaper to try a new transformer BUT add a inline 3 amp fuse in the secondary so that will be the last transformer you have to replace(just fuses)if the short is hard to find.Power up the old board & see if it works,unless there is obvious damage.The plug sometimes comes with a new board because there is a wiring change to install it(on some) replacement boards.

Oct 07, 2010 | Heating & Cooling

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