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Kenwood A97 Amplifier will turn on then go straight into "PROTECT". I lose all control of the amp, I'me tried disconnecting and reconnecting the speakers, made sure its all wired up properly and even checked the fuse in the plug but still nothing

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  • rando30 May 15, 2009

    same problem

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Hi can you please tell me what is the solution

Posted on Mar 31, 2009

Help! im having the exact same problems with this model

Posted on Aug 28, 2008

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System on standby due to short circuit, how do i repair


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.

Dec 12, 2011 | Kenwood Audio & Video Receivers

1 Answer

When i turn on my kenwood kr-v990d it powers up for about 2min then shuts down


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.

Oct 23, 2011 | Kenwood KR-V990D Receiver

1 Answer

We have a Marantz sr4500, everytime we put it on it makes a Zzzzzz sound and then it turns off with a loud "buk" sound and shows protect on the amp's screen, after few seconds the amp turns...


It is not so easy to probe into to find a protection fault condition. The fault can be your output drivers- the MOSFETS/IC's 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 like a HUM or HISS before the protect works. Faulty capacitors in these circuits also can cause similar issues and needs close observation.In this case I think that some capacitors are faulty as when the set is put on it charges on to make the amplifier work. Possible fault in the protect circuit or preamp.
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 , maybe a leak in any voltage/current sensing circuit. Also disconnect the speakers and test, if the protect is off then check for short on the speakers.

May 11, 2011 | Marantz SR4500 Receiver

1 Answer

Describe your kenwood manual "ka


Hi, Yes it is safe to leave this connection unhooked. The system control is what the stereo uses to remote control a cassette deck,cd,turntable etc... using the amplifier separately should be o.k. I hope this helps, good luck and thanks for choosing FixYa-Prodzilla

Apr 20, 2011 | Audio & Video Receivers

1 Answer

Kenwood RV300 is flashing "PROTECT"


the amp has gone into protection mode .but you knew that. the reason would be a crossed speaker wire. like fuses the polar switch opens when the cables touch /cross and is made to reopen when the cross it rectifyed disconnect all speakers stand the unit alone see if it powers up then. if not let me know

best of luck

Dec 08, 2010 | Audio & Video Receivers

2 Answers

What shall do if my kenwood show me protect?


Hello. It could be helpful if you would give us the exact model number of the Kenwood product you have. Kenwood has made many products over the years. While it's unlikely, your Kenwood product could be the subject of a recall or repair for this problem.

If it is not, please start out by checking your speaker wiring. If you have a short or bad connection, this can cause the amplifier in your Kenwood product to shut down as a way of protecting itself.

Check your speakers as well. Make sure all of them work. Also check the impedance printed on the back of each speaker. Compare it to the ratings printed in the Kenwood manual.

If none of this helps, and you do not find a problem, your Kenwood product may require repair. "Protect" is how the microcontroller inside the receiver is trying to tell you that something is wrong and if the unit did not shut down, further damage could result.

Apr 17, 2010 | Kenwood VR-509 Receiver

1 Answer

I need the schematics for a kenwood A97 amp


Can you check on other channel to get your values and ids of parts

Jan 06, 2009 | Kenwood Audio & Video Receivers

2 Answers

My kenwood amplifier suddenly off when i turn the volume high?


You need to make sure you ohms are correct if there too low this will happen to protect the amp.

Dec 03, 2008 | Kenwood KR-V7080 Receiver

2 Answers

My kenwood a97 hi fi amp has gone into protect mode a resistor is broken how do i get a diagram to identify the type i need


in my a-97 amplifier was the chip stk350-030 broken. I replaced it and it works again. The stk350-030 you'll find in the middle. Open the hood and cut the bottom (sound weird but its true)

Aug 01, 2008 | Kenwood Audio & Video Receivers

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