Having found an open primary in the small transformer providing standby
power to a Yamaha home theatre receiver, I want to source a replacement
of course.
The transformer is marked on the side:
XW608 AO
TAM M 0118
and has no voltage or power specs on it. On the schematic there is a
voltage shown across the secondary of 12.8V AC; the primary is 240VAC
since this is an Australian unit.
The transformer is physically small (about 30x30x30 mm, or roughly an
inch and a bit on each side) so I am guessing it has a rating in the
milliamp range for the standby switch, IR receiver and a relay to switch
on the main PSU.
Can anyone offer me guidance on sourcing a replacement? Searching for
the markings via Google hasn't turned up anything useful.
Thanks for any help,
Matthew.
http://www.jaycar.com.au/productView.asp?ID=MM2006
The output on the original is 12.8V but this is 12.6 - I don't know what
the tolerances are but I'm guessing it would be regulated in some way.
> Having found an open primary in the small transformer ....
>
That's strange. Transformer primaries don't open very often. I would be
inclined to dig deeper to find out why there's an open circuit (internal
fuse open? Bad connection? Melted wire?) and whether there is any fault
downstream of the transformer (shorted component?).
Near enough. What about Dick Smiths?
** Looks ideal.
As would the similar DSE M2851
BTW both unit are made to " class 2 " or double insulation requirements.
Important if that Yamaha receiver is " class 2 " - as I bet it is.
.... Phil
Don't know the reason, but I have removed it from the board and there is
infinite resistance across the primary terminals and no visible damage
to the transformer or the board it's on. Fuse is intact. The unit
would be about 5-6 years old I reckon.
> As would the similar DSE M2851
>
> BTW both unit are made to " class 2 " or double insulation requirements.
>
> Important if that Yamaha receiver is " class 2 " - as I bet it is.
Thanks Phil - there's no ground on the plug so I would guess double
insulated is the way to go.
The DSE part is cheaper and available locally - thanks!
Mebbe it has a faulty or tripped thermal protector ?
--
Cheers .......... Rheilly P
Any small transformer with an approximately 12V output should be fine.
Small transformers are impedance protected, the windings can be damaged
by power surges or an overloaded secondary. If the unit works after
replacing the transformer, it was probably just a surge that popped it.
The markings will be house numbering, either from Yamaha or their chinese part
supplier. The 0118 will be a date code - week (probably) 18 of 2001, and
googling that will not uncover anything helpful.
As others have said, any comparable unit with a 12v6 secondary will be fine.
Any downstream elctronics which are voltage sensitive will have some supply
regulation, to guard against mains input variation.
Apart from the Jaycar unit mentioned, Altronics have one which has dimensional
info at http://www.altronics.com.au/index.asp?area=item&id=M2851L.. 'tis a tad
weightier, implying to me that it has more iron or copper - both good things.
Even Trickie Dickie has one
http://www.dse.com.au/cgi-bin/dse.storefront/45e9221405120d9e2742c0a87f9c06b9/Product/View/M2851
Which one is for you depends on how critical size is, and how near you are to
the supplier.
In my professional repair life, I replace trannies in hifi units all the
time, that have primaries that have gone open for no apparent reason. Yes,
sometimes there is a thermal fuse in the primary, and yes, sometimes it's
connected across a couple of external pins so can be temporarily bridged for
test purposes, but I find it rare to then come across a fault downstream,
that has caused a genuine overheat that has led to the failure.
Arfa
That tranny will work just fine. The only thing that I would say is that
power transformers in domestic equipment are usually what's known as a
"designated safety component". This means that they formed part of the
original design approval which declared the unit physically safe - it won't
set fire to your house in the event of it failing - and electrically safe -
it won't make the equipment live in the event of a breakdown of the
insulation on the winding wire or terminations. You can identify components
which form part of a safety spec, and are thus "designated", because they
have an exclamation mark inside a triangle, marked by them on the schematic.
If you do substitute a non-Yamaha transformer for the original, this would
almost certainly compromise the original safety approvals for the equipment,
and if there were any unforseen unfortunate consequences down the line,
Yamaha would have no liability at all.
Almost certainly, replacing this tranny with a substitute, will cause no
problems at all, but I think that you should be aware of exactly what you
are doing for your own peace of mind. For what its worth, as a professional
repairer with a legal duty of care to the public, I would never substitute a
transformer that is going to run 24 hours a day, as a standby tranny is, nor
would I recommend others to do so. At the very least, I would try to check,
through the suppliers or even directly with the manufacturers, that any
tranny you intend to use is rated for continuous operation. I would also
contact a Yamaha spares agent to check the price and availability of a
genuine replacement, after you have proven that all is well by checking with
your substitute in place. Not trying to put you off or anything, just advice
...
Arfa
> Almost certainly, replacing this tranny with a substitute, will cause no
> problems at all, but I think that you should be aware of exactly what you
> are doing for your own peace of mind. For what its worth, as a professional
> repairer with a legal duty of care to the public, I would never substitute a
> transformer that is going to run 24 hours a day, as a standby tranny is, nor
> would I recommend others to do so. At the very least, I would try to check,
> through the suppliers or even directly with the manufacturers, that any
> tranny you intend to use is rated for continuous operation. I would also
> contact a Yamaha spares agent to check the price and availability of a
> genuine replacement, after you have proven that all is well by checking with
> your substitute in place. Not trying to put you off or anything, just advice
> ...
Thanks Arfa, wise words there and I will certainly think it over.
** ROTFLMAO !!
What "professional life "' ?????????????
> I replace trannies in hifi units all the time, that have primaries that
> have gone open for no apparent reason.
** Well, there is always a simple reason for such events.
But nothing is "apparent " to a congenitally BRAIN DEAD CUNT !!.
> Yes, sometimes there is a thermal fuse in the primary, and yes, sometimes
> it's connected across a couple of external pins so can be temporarily
> bridged for test purposes, but I find it rare to then come across a fault
> downstream, that has caused a genuine overheat that has led to the
> failure.
** LOL !!!!!!!!!!!!!!!!!
Might jus be becos the PROBLEM is UPSTREAM !!'
In the hands of the pommy IDIOT who owned and abused the stinking slope
head built POS.
... Phil Allison
Arfa
>>
>> "Arfa Daily" = Dodgy Advice Par Excellence Merchant
>
> Problem is, Arfa is right 99.9% of the time.
** LOL - says who ???
Someone who is also wrong 99.9% of the time.
....... Phil
> Read properly what I said you half baked antipodean TWAT
** I did - asinine fools like you make me puke.
> That tranny will work just fine. The only thing that I would say is that
> power transformers in domestic equipment are usually what's known as a
> "designated safety component".
** In Class 2 equipment only - you PITA pommy panic merchant.
> This means that they formed part of the original design approval which
> declared the unit physically safe
** In Class 2 equipment only - you PITA pommy panic merchant.
> - it won't set fire to your house in the event of it failing
** What does this paranoid know nothing fucking ASS imagine the damn AC
fuse is for .....
> If you do substitute a non-Yamaha transformer for the original, this would
> almost certainly compromise the original safety approvals for the
> equipment,
** Only in Class 2 equipment - you PITA panic merchant.
Then only if the replacement is not a Class 2 compliant device.
Both the suggested subs ARE !!!!
--------------------------------------
> and if there were any unforseen unfortunate consequences down the line,
> Yamaha would have no liability at all.
** Yamaha supplied the POS that fucking failed - you dumb as dog shit
pommy cunt.
> Almost certainly, replacing this tranny with a substitute, will cause no
> problems at all, but I think that you should be aware of exactly what you
> are doing for your own peace of mind.
** Whaaaaaaaattt ??
This anonymous pommy cunt is not balming anyone's piece of mind.
Cos the paranoid CUNT is damn well out of his !!!
> For what its worth, as a professional repairer with a legal duty of care
> to the public,
** Shame YOU have NO fucking idea what professionalism is all about.
Else you would not be posting such ** shite ** under a stupid pseudonym.
> I would never substitute a transformer that is going to run 24 hours a
> day, as a standby tranny is, nor would I recommend others to do so.
** That would be entirely because you are an autistic, knee trembling, know
nothing, fucking pile of pommy puke.
Well, at least that is so on your good days ...
> At the very least, I would try to check, through the suppliers or even
> directly with the manufacturers, that any tranny you intend to use is
> rated for continuous operation.
** LOL
Does so this anonymous PITA paranoid pommy cunt have proof there are any
that are NOT so rated ??
Arfa
** Asinine fools like Daily make me wanna puke.
**Yamaha are usually pretty helpful and not stupidly priced for spare parts.
Try them. The part will fit like a glove.
--
Trevor Wilson
www.rageaudio.com.au
--
Posted via a free Usenet account from http://www.teranews.com
Just killfile him Arfa. His signal to noise is about the highest of any
newsgroup contributor so really not worth wading through for the 1% of
useful stuff he posts.
--
*Heart attacks... God's revenge for eating his animal friends
Dave Plowman da...@davenoise.co.uk London SW
To e-mail, change noise into sound.
I've not had cause to use them for audio parts, but their computer side is
one of the worst I've ever come across and put me off them as a company.
--
*Can fat people go skinny-dipping?
Having read your posts in your more lucid moments, I don't doubt that you
have technical expertise, but any respect that you might build up for
yourself in the on-line electronics service community in between 'episodes',
is immediately blown again when those deformed neurons in your addled brain,
start firing randomly again.
I don't care if you disagree with something I post, and it's fine to say
so - it's what debate amongst SANE people is about, but when you start in
this way, you are just out of line. *I* certainly don't want to see it on
here, and I'm sure that most other regulars don't. Using the ultra foul
language that you do, in the extremely angry way that you do, might be the
norm in the community that you live in, but don't inflict it on internet
newsgroups, where there are likely to be much more sensitive souls than me,
and worse, children reading it.
Now go and take your meds, and if you don't have meds to control this
behaviour, I would STRONGLY recommend that you go and get some professional
help before you do something a lot more serious than abusing the pivileges
that you ISP provides you with ...
Arfa
** Excellent idea.
Then I can get stuck into this despicable, gutless pile of pommy excrement
with no interference.
...... Phil
** I know the exactly the sort of vile pommy shit you ARE !!
Hundreds of clones just like you are living right here in Sydney.
Aussies call the evil, narcissistic pukes: " Ten Pound Poms ".
Cos that is how much they paid for their passage here in some rusting pommy
tub.
Shame we cannot deport the whole disgusting lot.
"Arfa Daily Scum of the Planet MORON "
Which, I would venture to suggest, makes you EXACTLY what I first said you
were - descended from the real scum and criminals that we originally
DEPORTED to that arsehole of the world that you call home, because they
weren't wanted here. And you call me a moron ...
Twat.
Arfa
**Your lack of local knowledge is duly noted. Matthew posts from Australia.
The local Yamaha distributor provides an excellent backup for their
products.
--
Cheers,
Marc
* My email address requires the identical words and
* underscores removed to email me
"Dave Plowman (News)" <da...@davenoise.co.uk> wrote in message
news:4ebe421...@davenoise.co.uk...
** I know the exactly the sort of vile pommy cunt this is.
Hundreds of clones of him are living right here in Sydney.
Aussies call the evil, narcissistic pukes: " Ten Pound Poms ".
Cos that is how much they paid for their passage here in some rusting pommy
tub. Shame we cannot deport the whole disgusting lot.
"Arfa Daily Scum of the Planet MORON "
Truth is, you amuse me no end, but you know what Allison ? You don't have
the intellect to do this. No really. You don't. You have the literary skills
of a 10 year old and, apart from the filth that rattles round in your
porcine head, a vocabulary to match. But hey - do I care ? Not a bit. I've
been called worse in my long life, by far better than you, so you just carry
on doing it, and I'll carry on putting you down until it doesn't amuse me
any more. In the meantime, I might just run this past a very good friend of
mine who is in the police force. I'm sure that some of his colleagues down
your neck of the woods might be very interested to find out what you know
about any unsolved kickings to death ...
You know you really are one sorry excuse for a human being. I should think
that every good Australian - and there are many - who read your mindless
ravings, squirm with embarrassment at coming from the same place, and having
to put up with you as an ambassador for the country.
You are thick, and not only that, you are stupid in the most literal sense
of the word. Why ? Because I say so, that's why.
And you are still a TWAT.
Arfa
** I know the exactly the sort of vile pommy cunt this is.
Hundreds of clones of him are living right here in Sydney.
Aussies call the evil, narcissistic pukes: " Ten Pound Poms ".
Cos that is how much they paid for their passage here in some rusting
pommy tub. Shame we cannot deport the whole disgusting lot.
> Oh dear oh dear. You really are losing it aren't you ? Now you're posting
> stuff that you already did a couple of days ago ....
** I will keep posting it over and over until YOU make some attempt to
respond to the issues raised therein.
Or publicly admit you to being utter fucking moron and have not the faintest
bloody clue how.
It is worth repeating:
Piles of ASD fucked, human garbage like " Arfa Daily" are regularly taken
out to a dark spot at night and kicked to death here in Australia & the
Arfa
** I know the exactly the sort of vile pommy cunt this is.
Hundreds of clones of him are living right here in Sydney.
Aussies call the evil, narcissistic pukes: " Ten Pound Poms ".
Cos that is how much they paid for their passage here in some rusting
pommy tub. Shame we cannot deport the whole disgusting lot.
> Oh dear oh dear. You really are losing it aren't you ? Now you're posting
> stuff that you already did a couple of days ago ....
** I will keep posting it over and over until YOU make some attempt to
respond to the issues raised therein.
Or publicly admit you to being utter FUCKING MORON and have not the
I was quite happy to carry on making you look stupid for as long as it took,
and as long as it provided some light entertainment to others, but there has
now been another complaint, so I will take that as my cue to stop. Your
repeated reposting of the same old stuff has now ceased to amuse me anyway.
Arfa
The day I love that half-arsed plank is the day that hell freezes over, but
no worries, point taken. I was only carrying on with it just for the
amusement of winding him up, but his repeated posting of the same few lines
has become tiresome now anyway. As an Aussie yourself, doesn't his behaviour
as an ambassador of your country on here embarrass you ? Just interested ...
Arfa
Personally I blame the staff of the care home he lives in allowing such
unfettered access to the internet. It obviously isn't helping his
treatment.
--
*Why doesn't Tarzan have a beard? *
** I know the exactly the sort of vile pommy cunt this puke is.
Hundreds of clones of him are living right here in Sydney - hopefully most
of them will be dead pretty soon.
Aussies call the vile, narcissistic sociopathic pukes:
" Ten Pound Poms ".
Cos that is how much they each paid for their passage here in some rusting
very small 50/60Hz transformers can be a right pain, as the wire gauge
is so damn fine. Its extremely hard NOT to slightly damage, say, 44AWG
magnet wire when winding such a transformer.
Low power transformers must have extremely high magnetising inductance
AND low volume, so require silly numbers of turns of astonishingly
(vanishingly more like) fine wire.
One I used in an OEM UPS' had, IIRC, 11,000 primary turns, of (again,
IIRC) 44AWG. Now 41AWG is about 0.09mm outer diameter; 11k turns is thus
around 70mm^2, ie 8.4 x 8.4mm, which is about the cross-sectional area
ISTR for the primary winding.
And we had quite a bit of trouble with those - although they were made
in Mexico, for a very low price - all of which was related to the
termination.
Cheers
Terry
Give it up guys. You are both likely to get blocked by lots of folks on the
group if you keep it up.
Leonard
--------------------------------------------------------------------------------
I am using the free version of SPAMfighter for private users.
It has removed 1984 spam emails to date.
Paying users do not have this message in their emails.
Try SPAMfighter for free now!
> Give it up guys. You are both likely to get blocked by lots of folks on
> the group if you keep it up.
**Good.
I see you are still compulsively tossing off several times a day
in public
perhaps you might consider returning to blowing roddles ?
I have now Leonard
Arfa
> Give it up guys. You are both likely to get blocked by lots of folks on
> the group if you keep it up.
**Good.
**Again: The Yamaha distributor in Australia is pretty good.
> **Again: The Yamaha distributor in Australia is pretty good.
Is there just the one for all Yamaha products? In the UK I found the one
which dealt with their pro audio fine but not the one for computer stuff.
It was some time ago when CDW was newish and expensive. But I've got a
long memory. ;-)
--
*If God had wanted me to touch my toes, he would have put them on my knees
**Yep. Hi fi, computer and instruments. One big company. Japanese owned.
Good service and reasonable prices.
--
Trevor Wilson
www.rageaudio.com.au
> That tranny will work just fine. The only thing that I would say is that
> power transformers in domestic equipment are usually what's known as a
> "designated safety component".
** In Class 2 equipment only - you PITA pommy panic merchant.
> This means that they formed part of the original design approval which
> declared the unit physically safe
** In Class 2 equipment only - you PITA pommy panic merchant.
> - it won't set fire to your house in the event of it failing
** What does this paranoid know nothing fucking ASS imagine the damn AC
fuse is for .....
> If you do substitute a non-Yamaha transformer for the original, this would
> almost certainly compromise the original safety approvals for the
> equipment,
** Only in Class 2 equipment - you PITA panic merchant.
Then only if the replacement is not a Class 2 compliant device.
Both the suggested subs ARE !!!!
> and if there were any unforseen unfortunate consequences down the line,
> Yamaha would have no liability at all.
** Yamaha supplied the POS that fucking failed - you dumb as dog shit
pommy cunt.
> Almost certainly, replacing this tranny with a substitute, will cause no
> problems at all, but I think that you should be aware of exactly what you
> are doing for your own peace of mind.
** Whaaaaaaaattt ??
This anonymous pommy cunt is not balming anyone's piece of mind.
Cos the paranoid CUNT is damn well out of his !!!
> For what its worth, as a professional repairer with a legal duty of care
> to the public,
** Shame YOU have NO fucking idea what professionalism is all about.
Else you would not be posting such ** shite ** under a stupid pseudonym.
> I would never substitute a transformer that is going to run 24 hours a
> day, as a standby tranny is, nor would I recommend others to do so.
** That would be entirely because you are an autistic, knee trembling, know
nothing, fucking pile of pommy puke.
Well, at least tat is so on your good days .. ...
> At the very least, I would try to check, through the suppliers or even
> directly with the manufacturers, that any tranny you intend to use is
> rated for continuous operation.
** LOL
Does so this annoynous PITA paranoid pommy cunt have proof there are any
that are NOT ??
Won't hold my breath !!!
> I would also contact a Yamaha spares agent to check the price and
> availability of a genuine replacement, after you have proven that all is
> well by checking with your substitute in place. Not trying to put you off
> or anything, just advice
** Pile of ASD fucked, human garbage like " Arfur Daily" are regularly
taken out to a dark spot at night and kicked to death here in Australia
The decent blokes who do it deserve a medal.
....... Phil