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Denon AVC1530 Amplifier Protection mode

The Amp when connected up won't come out of PROTECTION mode.The other components all work fine when wired up to another amp.I have even tried after reset to factory settings,Anybody got any ideas ??

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  • Anonymous Feb 22, 2009

    blown ouput ..........what?

    please complete what part/s are being referenced.
    thanks

  • Hawrie Mar 20, 2009

    I have absolutely the same problem and my friend suggested there could be a Reset button somewhere... Do you think so?

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Protection means that the output stage of the amp has detected a problem. Usually this is because there is DC present on the speaker line indicating blown outputs. Figure on $25-$45 for parts plus the local labor rate for the repair.

Dan

Posted on Sep 09, 2008

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Yes that is why. The receiver is protecting itself from an un-stable load impedance which causes current/voltage spikes through the final amplifier components and proportionally through the input where the protection relay is (click),. Do not continue using the amp until you have repaired or replaced the blown speakers. A rule of thumb is to maintain 8 ohms on each speaker wire plugged into the amp. Keep that in mind or eventually you will damage it.

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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

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Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. Hopefully you have warranty De .A thumbs up would be greatly appreciated if this answer is helpful to you. nitro-bmw-486-amp-in-protect-mode-lv2kkrmxrai4iihdvw4m3np2-1-0.jpg

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The power supply is damaged and needs to be serviced. You have done exactly what you should have to test for an outside issue, it's the receiver.

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Hello john_hart,

Check the speaker wiring too. If one of the speaker wires is shorted or grounded, the amp will go into protection mode.

Hope this helps.

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Sounds like there could be a short somewhere. Check to make sure that there aren't any (exposed/bare) wires touching each other or if there is a bare spot of wire touching something metal. Check both ends of all the wires. A speaker wire may have come lose and is shorting out against the frame or some other place. Usually if it goes straight into protection mode or you're popping fuses you have a short somewhere. I assume the capacitor you installed is somewhere on the power line, which would be for helping with
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