I am not sure of the terminology involved, but there is a metal object
(running the width of the amp) with metal radiators on it. attached to the
underneath side of this object are four things each having three legs which
insert to plugs on the floor plane. of the four things, two are
green -labeled 2SA1075, and two are black -labeled 2SC2525. Each of the
four things has the letters O, Z, (G) near the three legs.

are these things the output transistors mentioned below? if they are, does
just one go bad? or are all four replaced at the same time? is the metal
object having the radiator fins called the "main rail" and/or "heatsync"?


here's a paragraph someone seemingly smart writes online,
source=http://experts.about.com/q/1749/3551382.htm:
The reason it shuts down is because of excessive current drain, thus
tripping the protection circuit and opening the relay feeding the outputs.

The output transistors (mounted on heatsinks) is the likely cause. You
will
have to replace them.

This is 80 to 90% of cause for failure in audio amplifiers.

Make sure you know how to do it; they are critical for proper mounting and
heat transfer.


"JVC dude" wrote in message
...
The transparent plastic cased object is the speaker protection relay
probably (or the main power rail switching). It should click in 5
seconds
after powering on - unless there is a fault condition such as a failed
amp
output where high DC voltages are sent out and would otherwise damage
your
speakers.

You say there are 2 large black plastic modules with 10-16 pins?
probably
with STK xxx on them. Its most likely that one of these has failed.
You ideally need to establish which has failed- its unlikely both have.
Is
1
getting hotter quicker? this is probably the dud.
Now If you've no experience on electronics I can't condone you trying to
replace this yourself- you need to unsolder it, check for other failed
parts
nearby etc and check the new one is running stably.
Take it to a techy really
Hope this helps
Andrew