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The mains transformer is open circuit on th input side therefore I need a replacement transformer

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Isn't it a blown fuse only?

Posted on Mar 27, 2015

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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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i) I assume the fuse you mentioned was in the mains plug - did you also check the fuse in the TH15A mains input socket? This is accessed by pulling out the tab in the bottom section of the socket (below the centre pin). This is a 3.15Amp antisurge fuse, 20mm type.

ii) If this fuse has blown, then replace it & all may be well ...... but if it blows again, then move to step iii).

iii) With mains disconnected, remove rear panel (outer screws) & check the power supply PCB for damaged components, especially R111 & R112 (100ohms). If the latter are burnt or open circuited, then the amplifier module may have blown.

regards, Dave

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Take the details to JAYCAR or some other electronic shop and see if it is possible to get a new one.

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Sony STR-DE575 connected to 220V


Doubt the main pcb needs replacing, but the standby transformer would definitely go in that situation. Standby transformer wouldn't be that expensive, but no way to say that it's the only thing that is bad. It is also soldered in, so you would need to know how to do that to replace it, or bring it to someone who could. If you're staying long-term in Europe, it might just be better to buy something local so as to not run into this problem again.

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1 Answer

Got a jamo avr693 amplifier the stanby transformer died .took it to shop for replacement but i was asked for its voltage which i dis not know can you please investigate the voltage for that little tr


I suspect that there is not a single standby transformer. Seems like a waste to have two transformers to power the same system. Your input voltage will be 220/110V depending on country. I also think that you need to look for a faulty IC/relay. Because most systems like that has a circuit for main power on and standby fed from the same power loop, main diff being that the moment you press main power on it energises a relay that self feeds and switces the main power on. Look for faulty relay or IC.

Dec 17, 2012 | Televison & Video

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The main transformer in my Sherwood amplifier is down the primary winding is open circuit. I cannot find the transformer outputs as to replace it. does any one know the voltages and current ratings for...


I would contact Sherwood as Transformers are deemed to be safety components and should be replaced with excat parts or those recommended by the maker.

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I have a Peavy "Classic 30 BT" guitar amplifier that stopped working. When the power switch is ON, the pilot light glows but the vacuum tubes don't even glow. Using a volt meter, I found that 120 Vac is at...


Hi and welcome to FixYa,

I have to agree with you that that component is a thermal fuse. In my country, they are readily available in most electronics/hobbyist parts store. These components are also used for small motors and therefore would also be available in some (but not all) kitchen appliances parts stores. A temporary workaround is to install an ordinary fast blow fuse.

Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Nov 28, 2008 | Audio Players & Recorders

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I have a Pioneer SA_410 Amplifier. Has open circuit mains transformer. Could you advise what its AC secondary output voltage & current are? Regards


I have replaced many thermal fuses in power transformers. Is the primary open?? If so, cut the copper shield on the primary side of the transformer with a pair of cutters and peel back the paper insulation to reveal the thermal fuse. Replace it and everythings OK!! If the secondary is bad there's no hope, of course. Anyway, in the meantime I will research your question and post again very soon. I have several old pioneer schematics and know where to find what I need.

Oct 04, 2008 | Pioneer Audio Players & Recorders

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