On Sat, 29 Dec 2007 00:26:44 +0100, "Torben Espoe"
wrote:

Hi
I have recently tried to repair a T762, not very succesfull I'm
afraid.
The story is this: I was listening to music one day and suddenly the
amp
shuts down with at loud POP in the speakers and red light in the
status led.
I turn it off and then on again and now there is nothing coming out
of the
speakers, other than hum when I turn the volume up to max. After some
checking I find that it can still switch between video feeds and the
main
amps still work if I use direct input.
After some seaching in the schematics I'm guessing that it has to do
with a
missing voltage, and sure enough the +12V is missing. After half an
hour of
disassembling I have the motherboard out, and I measure the 5V1
zeners and
one is dead. I exchange all 5V1 zeners with 5W types an reassemble
the amp,
but now it will not turn on.
The status light is amber, but no turn on. I measure the power on
+13V and
find it about 6,5V at D712. it seems that some thing on the +5,6V is
drawing
to much current for the poweron trafo.

Does anybody have any sugestions?

Torben

email exchange TWO with 2



A Google search seems to indicate the NAD T762 might possibly be one
of those "lemons" of domestic electronics we sometimes come across.

While this doesn't help much, a similar problem was covered on
sci.electronics.repair earlier this year, but without any positive
outcome.
http://groups.google.com.au/group/sc...de19570db5c6d7