Question about Kenwood KAC-728S Car Audio Amplifier

1 Answer

My amp powers on but no sound output..

Hello, My amp powers on yes the LED does light up but there is no sound coming out what so ever no matter what I do with the gain control, switchs etc. I took the amp completly apart and found no signs of burnage or smell anywhere. Now, you say in another post that it is going to be in the preamp stage. Do you have any diagrams in regards to this area and how to fix it?

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  • Phoenix0327 May 19, 2008

    same problem amp power on but i think the failure is in the positive and negitive connections to the speakers. No matter how i connect them no sound but amp is on and fuses are good

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My Clarion is doing the exact same thing...and im starting to lean towards a failure in the powersupply of the unit...it just cant produce the sound.

Posted on Mar 25, 2007

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How do i fix blaupunkt car amp red led lighting up as i give power to it .sometimes if i let the amp on it starts by it self .when the green led goes on the amp works till i shut it down no matter wha
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I wish I had better news.

Guru................saailer

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I have a Boss OL5KD Class D Monoblock Amplifier and I set it up but is no sound coming up from the speakers, can anyone tell me how to higher the volumen? where is located the volumen??I need to higher the...
Hello maydude01,

The Boss OL5KD does not have a volume control. It has an "Input Level" adjustment which is used to match the output from your head unit preamp output to the amp. It is the first rotary control just to the right of the input jacks.

If you have no sound at all, I'd suspect that something is incorrectly connected or there is no input to the amp. First make sure that the amp power light (green LED) is coming on when you turn on the receiver and that the protection light (red LED) stays off. Then check all of your wiring, especially the RCA output cables.

Initially set the controls like this: MASTER/SLAVE switch in MASTER position (left). INPUT SENSITIVITY 2v-8v (right). INPUT LEVEL, SUBSONIC FILTER, BASS BOOST, and LOW PASS FILTER; midrange. PHASE SHIFT "0" (left). Leave the remote level control disconnected.

After you've checked all wiring and initially set the switches and controls, turn the receiver on to about 3/4 volume. Now adjust the INPUT LEVEL to the left just until you begin to hear distortion, then turn it back right just a little. Adjust the other controls for best sound. Plug in the remote level control and make sure that it adjusts the bass up and down. You're finished!

If there's still no output from the unit after checking all of the wiring, either the unit is defective, it's not getting an input from the receiver, or the sub(s) are defective.

Hope this helps.

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1 Answer

Hello thanks the model # is FP5251 G105
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Disconnect all speaker wires from the speaker terminals of the amp and disconnect signal cables from the amp. If it powers up, the wiring needs to be checked. If the protect light remains on, the amp likely has blown output transistors.

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1 Answer

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