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Kenwood Midi M-97/M Switch power on and after a few seconds i get a protect message appear on A-97 amplifier and it blocks use of the system. -Paul

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  • Anonymous May 18, 2008

    comes on then amp goes to protect flashing on screen

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3 Answers

they suffer from a driver chip failure which can be overcome by replacement & fitting of a suitable heatsink

Posted on Jul 02, 2008

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I did all that but even without the cables connected I get the same message. I blowed out the ports etc. Still getting the protect code. Anything else we can try?

Posted on Jun 06, 2008

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This is prob because of a wrong connection between speakers connections + to + - to - check all speaker wires are correct with no shorting out between + & -

Steve

Posted on Jun 01, 2008

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1 Answer

My stereo sysytem is a mini stereo: serial number 10200055. It currently says "protect", what is this and how do we return our system to normal operations?


Hi there,

When the word PROTECT appears on this display, this means the unit has detected a critical fault which could potentially cause harm to your stereo system.

The most common cause is a short circuit somewhere - something even as simple as loose speaker wiring could cause a short, triggering the Protect message.

You will need to determine if there is a possible short somewhere, so I recommend you start by firstly turning power OFF, disconnecting all speaker wires, then turn unit back ON.

Operate the stereo (without speakers) and turn volume up:
  • If Protect message appears when turning volume up, then stereo unit itself has an internal fault
  • If no Protect message appears, then suspect the speakers may be causing the issue.
  • Reduce volume and turn unit OFF
Re-connect speakers (ensure the connections are secure), turn unit ON:
  • If turning volume up triggers the Protect message again, there is an issue with the speakers or connections

Hope this helps.....

Sep 04, 2011 | Kenwood Audio Players & Recorders

1 Answer

My denon receiver is stuck in stand by mode it goes on fro about 10 seconds and then shuts off the system, what can I do?


hi,
Your system goes to standby mode after power ON means it is in protection mode.
First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the protect show or not . if not, then any of the speaker is damaged. If then also it shows protect you have to check the amplifiers hardware.

AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Normally AV receivers show this when any of the output amplifier have some problem. there are six amplifiers in this AV receiver. May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
For that you need digital multimeter,soledring iron screwdrivers etc
Open the amplifier , then power it on. connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). then connect the positive terminal to all the output transistors emitter pin one by one . the voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
after replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. put the bulb in a holder. now you have to wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim . if so check the display, is there is protect mode is on or not . if not and come back to normal operation ,then remove the power , remove the bulb insert fuse and check
connect the power and check.
If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components.
ok

Jun 12, 2011 | Denon AVR-2807 Receiver

1 Answer

I have a Tevion 7.1 amplifier (AVR 2006). Protect overload flashes up and then shuts down. I have only had limited use since I had the unit from new (a few days). Last time using it someone pluged an...


The protect indication is due to a overload on the power amplifier unit. So you need to check the speakers to see that they are not shorted. remove all the speaker lines and switch on.
if there is a processor reset, power off the set and switch on while holding the selector/standy by switch. if not there is damage in the output within the amplifier.

Apr 26, 2011 | Audio Players & Recorders

1 Answer

My Kenwood VR-705 keeps on cutting out on me. is there anyway to fix this?


hi,
First of all remove all the speaker connections from the amplifier. After that power the amplifier and check the protect show or not . if not, then any of the speaker is damaged. If then also it shows protect you have to check the amplifiers hardware.

AV receivers shows protect mode , when there is a hardware fault in side it. Its a warning that some thing is wrong.
Normally AV receivers show this when any of the output amplifier get some problem. there are six amplifiers in this AV receiver. May occur when the output diver transistors of any of the amplifier become shorted. if the output transistor get shorted this will lead to flow of current through the speakers. To prevent this there is a protection circuit for each channels. One combined output of this protection circuit is connected to the system control. when the any of the output amplifier fails, the protection circuit detects it and switch of the speaker and sent data to the system control. when the system control get this data it will give a warning to the customer through display that PROTECT.
You have to check the amplifier.
for that you need digital multimeter,soledring iron screwdrivers etc
open the amplifier , then power it on. connect the negative terminal of the multimeter any where in the chase( metal body of the amplifer). then connect the positive terminal to all the output transistors emitter pin one by one . the voltage should be bellow 0.5V. If any of the emitter of the transistor shows voltage more than 0.5V., then that amplifier stage is faulty. Remove the transistors and check it. if it is shot then replace with a new one.
after replacing the transistors do not power up the amplifier directly from the main. You have to put a bulb of 60 watts in serial.
You can do this easily remove the mains fuse. put the bulb in a holder. now you have to wire from the holder. connect one of it to the one end of the fuse holder and the other wire to the other end of the fuse holder. Why using a bulb is, if there is any further problem in the amplifier stage on which the transistors replaced, there is a possibility of the new transistor get damage. if we use a bulb in serial with its mains supply ,when any overload in the amplifier occur the bulb will drop the current, by lighting itself.
After connecting the bulb in serious power on the amplifier. watch the bulb. It should light for one or two second and go dim . if so check the display, is there is protect mode is on or not . if not and come back to normal operation ,then remove the power , remove the bulb insert fuse and check
connect the power and check.
If the bulb shows bright light then there is some component also faulty in the same amplifier. after removing the power you have to check again the amplifier stage of which the transistor is replaced, for any other faulty components.
ok

Apr 23, 2011 | Kenwood VR-507 Receiver

1 Answer

My kenwood krf-v4060d reciever on/off switch is faulty, it stays switched on for a few seconds and then switchs its self off.can i get a replacement ? i have had not much luck here,any suggestions !


The problem is not likely to be the switch itself. The unit is rpobably going into "protect" mode because of a problem internally. Try removing all the cables and try to turn on the unit. If the behavior remains the same, the output section requires repair. The most common failure is the output transistors. Expect a parts cost in the $40-$60 range.

Dan

Dec 09, 2009 | Kenwood Audio Players & Recorders

1 Answer

Protect on a-97 amplifier (kenwood)


The audio amplifier IC are damaged and need to be replaced.

Aug 16, 2008 | Audio Players & Recorders

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 Players & Recorders

2 Answers

Kenwood VR-209 Receiver doesnt stay on


The power transformer is bad. Part # L07-2485-05 it costs about $ 85 bucks to replace it. It is the big one.

Nov 17, 2007 | Kenwood VR-209 Receiver

2 Answers

KR-X1000 Power Problems


Sorry, no freebies from what I see online. But, when you power up, does it play before it shuts down? This will help me formulate a better answer for you...accordianman

Oct 25, 2007 | Kenwood KR-X1000

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