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Repair and disassembly information for amplifiers in home audio systems.

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Technics amp RCA inputs barely works.

I have a Technics SU-V7X home amplifier and it works except when I plug anything into the rca inputs on the back and turn on the amp and select it I have to turn up the volume knob to max and the tweeter in my speaker plays very little of what music I’m playing, but if I plug that rca cable from my source into direct input it works like a charm but there’s only 1 of those and I wanna connect my new vinyl players and my Bluetooth receiver, so what causes the selector input to not work?

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You don't say what the "source". This is very important as it determines which ports to use. You are possibly just plugging into the wrong RCA ports.

Here's a start. Download Technic service manual:

https://www.hifiengine.com/manual_librar...

What do you mean by the term "direct input"?

This amp has:

  • Tape2/VCR (2 ports - Playback & Rec Out)
  • TV/Aux1
  • Video/Aux2
  • Cd
  • Tuner
  • Phono (MM/MC which is to do with the cartridge type on the turntable. MM phono preamps work with Moving Magnet (MM) cartridges. MC phono preamps work with Moving Coil (MC) cartridges )
  • Tape 1
  • Video (various in & outputs)

This link will take you to a photo of the ports:

https://www.canuckaudiomart.com/details/...

Does this help?

Much later. . .

Of course why didn't I see this!

You need to connect the left ouput to the left input and the right input to the right output, where the equalizer would have been.

Who ever had the amp before you had an equalizer and didn't put ther jumpers back in when they sold it.

99% sure this is the answer. It was!

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Those rca connectors that are connected together on the picture is there I connect my source on the input, when I got my amplifier those wasn’t connected together..

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@can_i_fix_it

Hi Magnus,

If you mean the "Graphic EQ/Ext" - you don't use those.

Just plug the two RCA cables from your turntable into the red and white ports marked "Phono"

and your receiver into the "Tuner" red and white ports.

Keep it simple.

You still haven't stated what you meant by "direct input". What is printed on the case?

完成的

I don’t have an EQ, if you look on the picture in your answer you can see 4 rca’s that’s connected together using some thick metal, well 2 of those connectors says input and I connect my Bluetooth receiver and the amp plays fine, but if I connect the Bluetooth receiver to tuner or CD or phono or TV rca input the amp doesn’t play at all, as I said I have to turn the volume to max and I can slightly hear the music on my speakers tweeter. Hope you understand, I’m from Denmark so my English isn’t that good :P

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@can_i_fix_it

Hi Magnus,

Yes I understand. You just didn't mention the EQ port - you just said "Direct"

Curious but if the EQ ports work then good. What does the manual say? I guess the other ports would need a pre-amp.

It is was made in 1986-88 so is a good one but old. It may need some capacitors replaced. Look for any that are bulging on the top or leaking brown substance. I fixed my NAD C352 amplifier, which is only 15 years old, by replacing the main power capacitors. I had no sound.

But my main area of expertise is computers and Windows.

Why don't you try one of the HiFi specific web sites such as:

https://www.diyaudio.com/forums/solid-st...

You could also try a DVD/Blu-Ray player, etc. or your TV, if it has RCA outputs, in the other ports and see if they work. If not then that would explain why the Receiver didn't work in them.

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@can_i_fix_it

Hi Magnus,

Of course why didn't I see this!

You need to connect the left ouput to the left input and the right input to the right output, where the equalizer would have been.

Who ever had the amp before you had an equalizer and didn't put ther jumpers back in when they sold it.

99% sure this is the answer.

完成的

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