Question about Kenwood Audio & Video Receivers

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I have a Kenwood KR-V7030 reciever. I think the right speaker wires short circuited when intalling. The "protect" display came up when I turned on the receiver. I shut the power off and re-installed the speaker wires but I have not been able get any sound out of the right speakers since. Any suggestions?

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  • Karen Jean Jun 29, 2008

    My receiver is not longer under warranty and returning it to the dealer or manufacturer is not an option. Does this receiver have internal fuses?

  • Karen Jean Jun 29, 2008

    This model of Kenwood receiver does not appear to have an external visible reset button.

  • Karen Jean Jun 29, 2008

    The right speaker works fine when installed on the left side so the speaker is not the problem.

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Remove the receiver and see the connection given to left speaker follow the same for right speaker .........the connections will be similar only.........

Posted on Jun 29, 2008

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If you have the tools, I can talk you through checking some things, but it is going to need some parts replaced I can say with some certainty. Do you want to try and fix it yourself?

regards
robotek

Posted on Jun 29, 2008

  • Graeme Ross
    Graeme Ross Jun 29, 2008

    so its either take it to a repair guy, or we whip the lids off and have a looksee... :) You can use the FixYa service finder by entering your zipcode for someone near to you.

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  • Master
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Hi,

Since it was just recently installed, would it be safe to assume that it is fairly new? If yes, perhaps your best bet would be to return to dealer/manufacturer for repairs/replacement. It is highly probable that the unit has sustained major hardware fault at least on the right channel. Even if it were just a fuse, it would still be to your advantage going that route.

Should for some reason you would venture a DIY, diagnosis and repairs of course would require fair familiarity with electronic components and circuitry, use of a VM and a soldering iron and preferable access to a service manual or at the very least a schematic diagram with voltage readings.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Posted on Jun 29, 2008

  • Louie  Role
    Louie Role Jun 29, 2008

    I understand and it appears that you are considering a DIY.

    Most devices of such nature would have fuses. Some designs make use of not only 1 but several. The fuses may come in various forms from the glass tube types to pico, surface mounted fuses or even fusible link/resistors.

    Since the Kenwood KR-V730 still works on the left channel, this may be to your advantage.With the use of an ohmmeter, you can compare resistance readings between the two channels using the left channel as template/basis. Initially, open the unit and do a visual inspection with particular attention to the power amplifier. It could either be an integrated power pack (IC) or a pair of transistors. As earlier stated, use the components of the left channel as basis and do preliminary checks on the resistance of each pin (with respect to the common ground). It will be a matter of elimination. Once a component shows deviation from the reading of the left channel, it is definitely defective. Soon as defective components are determined, it is a matter of purchasing replacement parts, desoldering the old/defective and soldering in the new ones. Simple as it may sound, often confusing readings may mislead you. Of course, it would be best to test components out of circuit/board.

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The short circuit must hve damaged ur right speakers or either its port.check out ur speaker with another reciever to check wether its working.
feel free 4 further assistance .rate the particular expert solution as fixya that helps u understand n solve ur problem

Posted on Jun 29, 2008

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HI,
The protect message means that a problem was detected and that the output speaker connections have been disabled.

Posted on Jun 29, 2008

  • Priya darshan Jun 29, 2008

    Try HOLDING the <3> and <6> key down while pressing the reset and continue to hold after releasing the reset button.



    You should get a display that says "DC ERR" or "DC OK". If "DC ERR" appears press and hold <1>.



    Now Press <2> and you should get a display that says "DC #". #
    being anything from 0 to 4. if not 0 press and hold <2>.



    Turn power off and back on

    If you still face the problem then you'll have to get it serviced.


  • Priya darshan Jun 29, 2008

    The protection function is activated when the speaker wire has a short-circuit or touches the chassis of the vehicle.

    Wire
    or insulate the speaker cable properly and press the reset button. (The
    reset button is that little pinhole button below and to the right of
    the volume control).

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Your unit is going into protect mode. Check your speaker wires and speakers to make sure you don't have a short. If they check good you more than likely have a channel that went out and needs rebuilt. If you have a DVM you can test your output transistors to find which chanel has the short.

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It is possible that the amplifier had encountered a fault with a higher current drain which had triggered it to a protection fault condition. The fault can be with your output drivers. Please check for short on the outputs fitted for both the channels. Use a meter after disconnecting to check for short in the drivers. Disconnect the positive and negative voltages to the output and see if the protect changes. Even a fault in the preamp stages that drives in high current into the output can shut the Amplifier. Sometimes this can be a noise which can be a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.You need to confirm and replace the specific stages or outputs. If not there can be issues in the mother board. Maybe the protect circuit by itself is shutting off due to a faulty bias or there is a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the amplifier comes out of the protect mode then check for short on the speakers.

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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.

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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 tech.

Check for loose speaker connections at the speaker as a root cause for intermittent shutdown.

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The reason why this is happening is because the reciever is going into protection mode due to a short circuit to the amplifier. It might be a speaker that is shorted out internally or there might be some speaker wires making contact with each other at the back of the reciever or at the speaker. The first thing I would do is disconnect all the speaker wires from the back of the reciever(make sure to label them before removing so you know how they go back). After removing the speaker wires turn on the reciever and see if it goes into protection mode. If it does then there is a good possibility that the internal amplifier might have a short. If it does not go into protection mode then that is good because there is more than likely a short on one of the speaker wires or speaker itself. Now connect one set of speaker wires at a time. After you connect each one try turning on the reciever until it goes into protection mode again. When it does you will have your culprit. Then try swapping speakers with that problem wire set and see if it still does it. If it does then it could just be the wires but also switch the wires to verify that the amplifier does not have a bad channel. If swapping both the wires and the speaker swapping produces the protection mode then that channel for the amplifier will be defective. I hope I have not confused you too much.

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MessageRate.ThreadID = 3632423; MessageRate.ProductID = 0; c81ea4d.jpg smarthome2
Rank: Guru
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The most common problem found on FixYa for Audio Video2_bing.gif Receiver's is:

My receiver say's "Protect" or turns on then off. What's wrong? Seven times out of ten it is a shorted speaker or speaker wire2_bing.gif. To determine your exact problem, the first step is to disconnect all speaker wires "at your receiver" Next: Turn the receiver back on. If your receiver still says "protect" or turns off, it needs to be serviced. If your receiver stays on; reconnect your speakers2_bing.gif one at a time and power back up after each speaker. You may find that after reconnecting all speaker wires it works! Most commonly the small braids of wire from the + to the - have touched and have caused the problem. In some instances, you noticed the problem only when turning the volume up. either way, make sure the exposed wires to your receiver are no longer than 1/2" long and are completely under the screw down terminal or slide in. When you've found the wire or speaker with the problem, your receiver will go back into "protect" At this point, disconnect the wire from the speaker at the speaker that may be causing the problem then test again.* Note* Make sure speaker wires do Not touch each other as this Will cause a short! If you turn the receiver back on and it stays on, you now know the problem is in your speaker itself. To test your speaker, you will need a multimeter. Set it to ohms resistance and touch the speaker terminals, if there is a short internally the meter will read "1......" If it's an analog meter, it will peg to the right. There's your problem. Now, within any speaker there are quite a few possibilities as to what could be causing the problem. Most common is a blown coil and the speaker needs to be replaced. Some speakers have internal crossovers (usually floor standing speakers2_bing.gif) and may have a shorted or burnt board (usually very visible brown burn marks on the board) and can possibly be repaired if your handy with a soldering iron. Now, if you disconnect the speaker wire at the speaker and it still says "protect" Check your wire for the obvious cut or nail thru the wire if possible. If your system has wiring that runs behind walls, you may need to use your meter again. Disconnect the wire at both ends, keep the ends separated, put your meter on ohms resistance and touch probes to the + and - wires at one side. If the meter pegs to the right or reads "1...." the wire is shorted and needs to be replaced or repaired at the short. Hope this helps.

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The speaker protection circuit sounds to be engaged. This protects you speakers form damage if a fault condition occurs inside the amp. Generally speaking, unless you have good experience at fault finding electronics, then this may be a job for a repair guy. If you want to know more about diagnosing the problem, get back to me here. Good luck :)

regards
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