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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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There will be noaudio coming out , if the protection circuits is

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from further damage ( or the amp itself ).

These needs servicing.

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Hi I have a Kenwood HI FI System with an amp that says protect can you help,Thankyou


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Jan 04, 2012 | Car Audio & Video

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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

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1 Answer

Protect on a-97 amplifier (kenwood)


The 'protect' is there to protect the main circuit board.
It is normally set off by the output stage going faulty and drawing too much power. The output stage is either made up of 4 large transistors or one very large Integrated Circuit. Either or will be attached to a big bit of aluminium, might be painted black and have fins or just raw aluminium. I've never heard of any system with a protection bypass. Be a bit like having a car where you can switch the brakes off with a button!
What happens if you disconnect all the speakers and any aux outputs?
If it stays on then the problem is with what you have attached to it.

Mar 29, 2009 | Audio Players & Recorders

1 Answer

Amp turns off after about 5-10 minutes of use for a few seconds


One of two things...Amp is going into overload protection (should be indicated by a light on the amp), or you have insufficient power going to the amp....if this is the problem, try a 2 farad capacitor on the input power line to the amp.

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check the speaker wires are not shorting out

Dec 11, 2008 | Audio Players & Recorders

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This fault may be similar to a Harmon Kardon AVR1550 fault I recently encountered. I did all the usual checks e.g. testing for presence of DC on speaker outputs etc. but all seemed fine, then the fault cleared! Next day it re-appeared and attention was (falsely) given to the protection circuits as the amplifier circuits themselves were considered to be in order. The HK uses both voltage and current protection circuits and it was discovered that the current protection circuit was operating. Eventually the fault was found to be one of the 0.39 Ohm 3W metal oxide resistors that had gone high in value on the left hand channel. Of course your amplifiers fault may not be due to this but the reason for going into standby would probably be the same i.e. due to amplifier protection circuits operating. You need to check out all the output devices and those resistors on every channel, even surround ones you may not be using. Hope this helps.

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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

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