Some light fittings have an external fuse on the 12v side. Do have a look to see if it has one. Maybe you simply just need a new fuse.
Transformer light wiring
- Thread starter Robertspaw
- Start date
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That would be annoying.
I’ve taken the whole lamp and the transformer off and just wired the 240v pendant light into the mains.
I can’t see a fuse and I’ve changed the whole transformer unit which hasn’t fixed it. Is there any way I can check whether there’s a short circuit and where this is if it is?
Sounds a bit far fetched but it seemed to have happened at exactly the same time as the earthquake a couple of weeks ago... surely that can’t be the reason???
Sounds a bit far fetched but it seemed to have happened at exactly the same time as the earthquake a couple of weeks ago... surely that can’t be the reason???
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You have got the wires in the terminals properly, if there push in type, its easy to push in the wrong hole.
Also its not unheard of for all the lamps to fail, i assume you know at least one lamps ok
More pictures may help, of the fitting and relevant transformer terminals
Also its not unheard of for all the lamps to fail, i assume you know at least one lamps ok
More pictures may help, of the fitting and relevant transformer terminals
To go any further you need a test meter. As as first step you need to be able to check that there is voltage going into and out of the transformer.
Trouble is it is not a transformer, but a switch mode power supply operating at 10s of KHz and you can't measure that with a standard test meter.
So, your suggestion is, what?
You may well not get an accurate measurement at that sort of frequency but I think that almost any meter would be adequate for TTC's suggestion to check if any voltage is coming out of the thing.
The chances of it producing some voltage, but not the right voltage, are very slim.
Kind Regards, John
Im confused with that post
I may be wrong
The first bit implies you will get a reading
The second bit implies your unlikely to get a reading
The first bit implies you will get a reading
The second bit implies your unlikely to get a reading
Ah. maybe I was very unclear/ambiguous. I wrote ....
Would you perhaps have been less confused if I had written something like ...
??
Kind Regards, John
Not sure.
Are you saying a meter WILL measure a reading, if its working and if so that voltage reading will likely be correct.
Are you saying a meter WILL measure a reading, if its working and if so that voltage reading will likely be correct.
It doesn't seem like my night for clarity
I am saying that ...(a) if any voltage is coming out of the PSU, even at a frequency of 'tens of kHz', the meter should indicate some voltage, and ...
(b) if some/any voltage is coming out of the PSU, then it is very likely to be the correct voltage. It is (at least in my experience) very unusual for such a device to become faulty in the sense of outputting some voltage, but the wrong voltage.
Hence, if the meter shows anything, it is very likely that the PSU is working correctly and outputting the correct voltage. If the meter shows absolutely no voltage, then the PSU probably isn't working.
Have I got there yet?
Kind Regards, John
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