Turntable - Problem with AC Adapter

GeorgePal

Member
2013-05-06 4:40 pm
Hello!

I have a Philips FP146 turntable from the '90s!
Yesterday I tried to use it after at least a decade. It didn't work. I opened it and I realized that its AC adapter is not working properly.

The name and serial key of its adapter is:
AMC 8549
3111 158 30050

Is there any possibility that I can find its technical info in order to replace it with a new one?
The only informations I can find about on the turntables are:
220V, 50Hz, 14W

Thanks in advance! :)
 

Mooly

Administrator
Paid Member
2007-09-15 8:14 am
Somewhere on the adapter it should (I would have thought) give the voltage and whether its AC or DC output. The 3111 bit sounds like a Philips part number.

Maybe close up pictures would help.

Are you sure the adapter is faulty ? Maybe a cable break or problem with the connector. Getting a new adapter should be easy as long as we know the voltage, the polarity and whether its AC or DC.

If you don't get much response I can move this over to "power supplies" forum.
 

GeorgePal

Member
2013-05-06 4:40 pm
The last one is from the turntable.
 

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Mooly

Administrator
Paid Member
2007-09-15 8:14 am
I was thinking of a little "wall wart" when you said adapter.

That's a simple mains transformer with one secondary. Is it open circuit on the mains input side ? Many have a thermal fuse embedded in the windings. Check the winding on a meter on ohms range, It should read low resistance across the mains input side.
 

Mooly

Administrator
Paid Member
2007-09-15 8:14 am
More info... if you look where the secondary connects in the TT you will find either a single diode rectifier or a bridge rectifier. Close to this will be a "large" electrolytic capacitor. If you look at the voltage rating of the cap we can work backwards to deduce a reasonable ball park figure for the transformer voltage.

If the thermal fuse is open circuit then there is always the possibility that a fault (such as a shorted rectifier etc has caused the tranny to overheat. It may or may not be just a faulty transformer.
 

Mooly

Administrator
Paid Member
2007-09-15 8:14 am
I'd normally suggest a component retailer (which depends where in the world you are of course).

For example,
CTFC12-9 - CAMDENBOSS - TRANSFORMER, 12VA, 2 X 9V | CPC

My worry is that there is possibly a fault with the turntable that caused failure of the transformer.

Normally some basic tests would be done on the transformer first. Are you 100% its faulty ? and that that alone is the problem ?

I haven't actually downloaded the service manual but based on the 15 volts DC mentioned earlier suggests a transformer of around 9 to 12 volts AC. Small transformers have a poor regulation factor. That means when lightly loaded the output can be considerably higher so a 9 volt tranny could give nearer 10 volts. And its all regulated back down to 8 volts again anyway.

Knowing the approx physical dimensions of your tranny would help too in selecting a replacement. We need as much info as possible to make an informed choice :)
 

KatieandDad

Member
2011-11-17 3:49 pm
UK
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Mooly

Administrator
Paid Member
2007-09-15 8:14 am
You should be able to get away with any 30 or 50VA 12V transformer.

Toroidals are more common these days..30VA 2X12V 1.25A Toroidal Transformers | eBay.. but if you really want an EI type I'm sure they can be had.

I've just spotted a 630 ma fuse on the secondary side so its really low powered, probably around 10 to 15 VA.

George... all that means is the transformer can be a small physical size.
 

KatieandDad

Member
2011-11-17 3:49 pm
UK
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Mooly

Administrator
Paid Member
2007-09-15 8:14 am

GeorgePal

Member
2013-05-06 4:40 pm
I'll have to leave it for now... but are you sure the old one is faulty ?

I don't know whats its name in English, so I'll post an image.

While I was trying to figure out what caused the problem, I found that this
[IMGDEAD]http://www.markidis.gr/images/products/FAST5X20.gif[/IMGDEAD]
was burnt. So, I changed it and tried to open the Turntable on again, but it burnt the new one too. I disconnected everything from the AC except the ON/OFF board. I changed the on/off button, tried to open it, and I had the same problem. So, what else may cause the problem?
 
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