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I have replaced down lights and transformers 3 times this year, is there an answer to this expensive problem...not only the equipment, the electrician has been costly as well. Will it be easy to change to traditional lighting, since the rest of the house has traditional lights I've not changed since entering the home in 1988 Dimming the lights is never done, its just the lights are fixed to-day, then 2 weeks later say, half of them dont come at all. Can I also say that these rooms that have these lights are hardly used, so that days can pass without having put a light on.

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If those oights are giving that much trouble, then it is time for a complete overhaul or a change out to regular lighting...
There is something going wrong there...I'm thinking that the transformers are too light and that is why neither are holding up...
Seems like a complete analysis of the system is needed and I think you would find that the parts are being used.... otherwise there is no reason for the maintenance issues that you are having....
I'm surprised that your electrician has not totally checked the system to find out what is going on...seems like he is not very familiar with those systems and therefore is just replacing like it was instead of trying to find the actual problem...

Find another electrician or convert to something else...


Posted on Nov 06, 2010


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From where i can get service manual for ge ups sg series 100kva

I have not found a free service manual. You may want to try contacting GE or similar service providers to see.

Manual no longer online, but one issue mentioned in case that is of any use.

"Les posted an answer 3 years, 4 months ago 0 Common problem with this unit when it is dead is the D5 Diode on the output of the Transformer TR1. It is a small black diode between the transformer and the capacitor C1. The diode goes short circuit and the airconr does not come on at all. The Fuse does not blow as the diode is not on the mains side of the transformer. I replace the diode with a 1N5408 and the unit runs no problem."

FIXYA question that might be relevant if it affects your equipment:

Quoting "" Have a logic portable air conditioner lpe-10hp keeps saying ft erroror wich means full tank but there is no water in unit have tryed to drain but nothing
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Means the sensor or the control board are defective

Jul 30, 2018 | GE Computers & Internet

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Single phase or 3 phase

Hmmm. Good question. Like anything, it varies depending on how the equipment is going to be used and in what environment. We could really get into the weeds, but let's just ask the couple of key questions.

1. Is this a commercial or residential environment?
2. What's the horsepower of the motor(s) in use?
3. What's the availability of 3 phase power?

1. If your saw is in daily, commercial use, then 3 phase may offer some distinct advantages: While it's expensive to convert (assuming you don't already have 3 phase available) it allows for smaller, less expensive wiring, and lower voltages making it safer and less expensive to run.

Single phase, otoh, is much more available, and runs motors up to 5hp with little difficulty. It does actually cost more to run a lot of single phase equipment so if cost is an issue and you have quite a few motors, this may be a large determining factor.

2. As I mentioned, if you're only running one or a couple smaller motors, up to 5hp, single phase should work just fine. I have several pieces of machinery with 5 hp motors them on single phase 220 and they perform great. I don't recommend 110vAC for motors under significant load. They run too hot and are not all that efficient, as well as under-powered.

3. Installing a 3 phase electrical system can be very expensive. I would look into this carefully, get a few estimates before moving ahead. You'll need to find out if it's even available, cost of transformers for 110 in the building as well as whether they'll charge you commercial rates for your electricity once it's installed.

There is no simple answer for this question, I fear. There are simply too many factors to consider.

This is the short answer. A simple web inquiry will give you more answers than you actually need.

Good luck.

Jan 02, 2016 | Saws

1 Answer

Our lights were all connected to one transformer, but the second half of the lights were dimmer than the first half. I installed a second transformer to help eliminate the dimming for the second half of...

1) Problem could be transformer voltage and/or length-and-diameter of wire.

2) Open following link for power pack resources including links to manuals, tips, trippers, instructions, and troubleshoot:

3) Unclear what is meant by 1st half and 2nd half of lights.
Do not connect transformers in parallel or series with each other.
Test across terminals A and B and see if it shows 12 Volts. If voltage is less, then power pack is not functioning correctly.
Power pack wattage must match total wattage of bulbs.
First bulb must be 10 feet away from transformer.

4) Use following chart for wire size:

5) Review resources above, and then add a comment for more help.

6) Take a moment and rate answer:
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call

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Hello, I have a Mackie 1604 VLZ Pro from 1995. It's 110 volts and I want to change it to 220 volts. Do I need to buy a new transformer? I don't want to us an external step-down...

The LEAST expensive thing to do is to buy an external stepdown transformer.
Here is a link:

The 100 Watt would be adequate... If you think you might need more you could have a reserve for other equipment... At around $8 USD I don't think you can beat that. The labor cost to change the internal transformer would cost many times what the external transformer costs, not to mention the cost on a new internal transformer.

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Hi, I ordered my Adam a7x from america to Australia. When receiving them, i plugged in australian adapters (300/500volts). But when powering them up, unfortunately the light went on and then a...

Did you just use adapters or actual step-down transformers?
A lot of equipment today is 110/220 auto-switching, but if you get something built for 110V (120V, 100V, markings may vary) only, then you need more than an adapter, you need a transformer!

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Power at 3 feet, not at 2 feet ???

You might need to check the power source for proper voltage, sometimes outdoor wiring is at the mercy of the elements. Rusty screws on recepticles and so forth. Another problem could be exposed wire in the line bleeding of to ground. Sometimes this happens if a fixture is removed and the wire not properly protected. If these are none of your problems just take up your fixtures and replace the wire. 16 guage underground feed will probably be less expensive than the transformer you bought.

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I think your microwave is dead. Well, as good as. This can happen if the main power transformer breaks down. One transformer has several outputs - so some functions still work, but those requiring the most power do not.
Unfortunately the Transformer is one of the most expensive bits.
This plus the cost of repair is probably more than a whole new unit.

Sorry this is not a quick fix for you, but please take the time to rate this solution as the least expensive option.

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Screen went black Panasonic TV/ PT-47WX53

Hello twisttolife,

What you have lost is horizontal deflection, this is caused by loss of the horizontal drive signal to the yoke transformers on the CRTs, for all three of these to fail at the same time is not likely so what I think is that the drive amplifier may have malfunctioned. To check this you will need:

1) schematic diagram or service manual (to determine the proper voltages and signals on the deflection board)
2) Multimeter (to measure the DC voltages on the components of the deflection board
3) Oscilloscope (to view the waveforms on the deflection board)

With these three pieces of test equipment you should be able to troubleshoot this problem.

Now if you do not have this equipment and what to take a chance at a blind guess, and just replace a board, I would suggest replacing the deflection board, this board usually contains the flyback transformer, the Convergence modules (which can cause this problem also), and the connections to the yoke transformers.

I hope this helps,


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Display on Denon AV-887 receiver does not show anything anymore...

This is most often caused by a bad power transformer. The power tranformer has several different secondary outputs and one of them is the supply voltage for the display. There are several other things that can also cause this problem, but all of these would require some knowledge of electronic troubleshooting and the proper equipment to test it.

I work at an authorized Denon service center and have repaired many Denon receivers, so I do have hands-on experience with these.

If you have the proper test equipment, like a multi-meter at minimum, I could help you to figure out what is causing your problem. If not, you really should just take it in for service. The model number of your receiver would indicate that it may still be under the manufacturers warranty. It has a 2 year warranty, so you can probably get it repaired for free. If it has been more than 2 years since you made the purchase it would still be worth it to get it repaired. This is a very expensive receiver and even if it needed the power transformer, which is very expensive, it would still be cheaper to pay for a repair than to buy a new one of equal quality. Even the very best electronic equipment breaks down at some time, it is just unfortunate that yours took a turn for the worse this soon.

If I can be of more help feel free to post a reply and ask.


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Rca model number d56w20

Most of the problems I've seen on that set are on deflection p.c.b. After removing rear cover it is the board on the bottom left hand side. Look in the middle section of it for 3 to 5 capacitors which are bulging on top. Replace them with higher value components. If they are not visable it is probably the high voltage transformer that needs to be changed. Either way it will require troubleshooting test equip. and soldering equip. You can replace the whole board with a rebuilt for around 250.00 Good luck, Russmann.

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