Question about Kenwood VR-5080 Receiver

2 Answers

No sound from speakers

Everythign works fine, except no sound from speakers. The receiver immediately goes into overload protection when turned on. I have checked the thermistor it works fine. All fuses and power supplies are ok. When turned on the cooling fan turns on all 5 relays change from normally closed to open. All channels have individual amplifiers, if one power amlifier is blown ie. Channel A will the overload shut all outputs off.??? Any ideas as to what might be the problem with this damn thing?? Any help is much appreciated.

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  • gurmeet mangat May 18, 2006

    Checked out the B+ line and all is fine. I figured out that the +/- 17 VDC (which is the supply for all the IC`s) has gone missing. Next step is to find the regulator. For the IC I only see +2 VDC and -0.6VDC at their corresponding pins. I believe the regulator may be shorted. Any thoughts?

  • gurmeet mangat May 27, 2006

    OK, I have all the schematics for this amplifier. I have checked the +/- 17VDC regulating cct, all components are fine. There is a digital transistor which swithches on the 17V cct when it recieves a pulse from an IC. I am going to try an scope the signal going to the transistor. I did notice the supply voltage for the IC is 4.0VDC when schematic calls for 4.8. Could this be an issue. I have the schematic in pdf format, I can email it to you if you wish, so you can have a better understanding of what I am talking about. Thanks for your help.

  • gurmeet mangat Jan 11, 2008

    I know its been a while, I found schematics. The only Voltage missing is +/- 17 VDC. It is used for the "volume cct" I have the schematics in pdf form and IO can send the exact page were the voltage is missing. How can I go about doing this???

  • phorapples Dec 28, 2008

    I have a similar problem, but there is output it is simply very low. When I turn the volume level to the maximum undistorted sound plays from both speakers fine, but at normal volume settings the sound from any input does not come out or is barely audible.

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Send it to Kenwood Authorized Service Center East. They have the fix for your unit.

Posted on Mar 07, 2009

  • Jack Ollila
    Jack Ollila Apr 27, 2014

    Has anyone found a solution for this issue? Thanks!

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In most recivers or amps yes if there is a short in one channel all the amps go into shutdown or into the protect mode. Now if you know how an amp works then you should be able with a schematic to find out what amp is causing the over load simply by see in the schematic where the speaker output is on the curcuit and then measure for a DC B+ . Thats the amp you would disconnect to conferm that all the others were ok as an output on an amp curcuit shouldnt have more then .3 to .8 volts dc unless its unbalanced.. Seek a pro to assit you if you dont have the equipment to test the amp and for sure get a service manual or schematic diagram. Good Luck

Posted on May 16, 2006

  • Larry  Dillon
    Larry Dillon May 18, 2006

    To trouble shootmthis correctly your gonnna need a schemaztic diagram see if you can getbon and post the proper part to us and we will assit you. Good luck

  • Larry  Dillon
    Larry Dillon May 19, 2006

    not shorted as if it was a shorted regulator then it would be a very high voltage But I would check for an open resistor 0r an open regulator transistor.

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This can happen if there's a dead short in a speaker wire or if you're using very low impedance loudspeakers at high volume for an extended length of time. If the protection light came on due to a speaker wire short, low impedance condition or a bad speaker, the receiver's power will need to be turned off to reset it. Before turning the power back on, all speaker wire connections should be checked for their integrity at the receiver side and at the speaker side. If the protection light goes on immediately after you turn on the receiver, disconnect the speaker wires at the receiver side and retest. If the receiver's protection light goes off, then there would still seem to be a problem with one channel's speaker wires or speakers. Connecting them one by one and retesting should allow you to find the problem speaker or connection.

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I'd suggest you try the basic speaker setup routine with tones to be sure all speakers work and none are shorted.

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on; or it may turn on but produce no audio to the speakers.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

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You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

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Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

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Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and
operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by
the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient
ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan
(if equipped) is running as designed (some only operate on demand). Clean dust and debris
from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection
cycles in their lives so continuously resetting or cycling their power without addressing the
cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections
and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not
come up the problem is internal and should be left to an experienced and competent hands-on
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Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.


Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Eure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

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Generally speaking, an amp protects itself from heat, shorts and overloads by refusing to turn on or stay on.


Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.


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