"Matthew Kirkcaldie" wrote in message
...
As a follow up, would this do if I can't get the same component?

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.

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