My amplifier is plugged but doesn`t bring a sound why?

Try opening it check for Blown fuses =]

It could simply be a faulty or burnt out bulb, just find a small bulb at Ace Hardware or the similar, and replace it.

I have OFTEN found that a cable has come loose. Open the unit and look for such a situation. Also make sure the motion (probably a disc) is working/rotating since with high power LED devices, they have interlocks for safety to keep beams moving.

This is alimentation fault of the amplifier inside the box. Dismount the amplifier block and take a look first if there are some burned pieces. If it seems all ok, better bring it to a electronics/ tv service center.

Hi.
If the red light is coming from a tube and you notice a loss of sound when it lights up, try reseating the tubes. You have to make sure that the amplifier is cool and is not plugged in to any power source when you do this and you have to be very very careful with the glass tube as well.
If the red light comes from an LED, it may be an indication of a bad wiring. Check if all wires are in good condition and are soldered correctly.
I hope this helps. Thanks. :-)

Lots of electronics have lights (LEDs) that turn on when they are plugged it. Most people just don't notice them. If it is working properly, then the light is normal.

bring it to the service near you coz thats repairable that was power problem

technics amplifier su-d5000 user manual

check preamps small parts! maybe you have change value capacitors and resistors!

With the system turned off, disconnect the speaker wires from the amplifier. Turn on the system. If the light stays red, then the amplifier has an internal problem. If the light turns green, then your problem is a blown speaker, or a speaker wiring issue.