My Denon avr1603 worked perfectly for 17 months then last week it started to shut itself down (auto protect ?), read manual and disconnect all speakers, wait till unit is cooled down turn back on, after 6 minutes exactly it shuts down again,led starts flashing fast, use remote to turn back on because it is in standby mode,after 30 secs shuts down again.
Take unit to sales to be fixed comes back after 3 days stating the flat cable connector to front panel was the problem, take unit home set it up after 10mins use shuts down again with the same problem all over, can anyone help me please
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Re: Shutdown protection? HELP please
All of the Denon recievers I have repaired (over 100) that shut down after a very short time are going into protect mode. The display lights up and after about 10 seconds the display goes out and the standby led blinks red.
I have found that they have one of 3 possible problems and they all require that the reciever be taken apart and fixed at component level. No way to tell what your problem is until it gets put on a bench and troubleshot.
Problem 1. This is the most common problem. One of the front channels shorts out. On the big heat sink the front channels are at each end. It is the front left channel (close to the display) This requires that the output transistors be replaced as well as some driver transistors and some resistors and a capacitor. Lots of work for a blown channel. Denon has put out a bullitin to upgrade the bias transistor and change a couple of resistors to help compensate for this failure. That channel overheats more than any other channel.
Problem 2. There is a resistor that is right next to the preamp board that opens up. It is a 10 ohm 1 watt resistor and when it opens, it causes the unit to go into protect.
Problem 3. The +12 volt regulator fails. It is in the power supply area on a smal heat sink right next to the -12 volt regulator. Generic part number is KIA7812 It also causes the unit to go into protect.
Most decent repair shops can fix these from about $120 up to about $200. Depending on which problem it is and how fast they are at finding the problem. Most charge labor by the hour.
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power off the unit using the front panel Pwr switch
press and hold SPEAKER A and B buttons;
keep pressing on the speaker buttons, switch on the AVR
when the display is blinking release buttons Check the attached links,instruction and guides, Good luck
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Is that a 12 on a -80 to + whatever scale? I don't blame it.
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.
Typically this is because of heat generation. There are protection circuits that will shutdown the receiver when it gets too hot. There are many reasons for this. Can you update this with the make and model please? That will help to determine the possible causes of the heat shutdown.
It's going into protection. Check your speaker wires at the receiver, make sure none of the braids from the + to - are touching. Then if you still have the problem, disconnect the wires at the speakers and test power. If your receiver still shuts down, disconnect the speaker wires at the receiver and test. If the problem persists, it is a problem in your receiver and it needs serviced. Hope this helps. If you need further help, post a comment and I will help you further.
Did you recently move any speakers around or any items near the speaker wire connections? It sounds like you may have a speaker wire shorting which is causing the receiver to go into "auto protect" mode. Check all of the speaker wire connections on the back of the receiver and at all of the speakers to make sure the wires are not touching or close enough to possibly touch.
replace all the electrolytic capacitors in the power supply. i had the
exact same problem with mine and once i replaced the capacitors it
powered up and stayed on and worked perfect. these capacitors tend to fail as they're of poor quality. this fault is very common on denon receivers, especially the later models.
This is a safety feature and can not be shut off. The system is detecting a problem in the last output stage of the amplifier and is shutting down to prevent further damage. I suspect a bad coupling capacitor in the pre-amp stage. This is a relatively simple repair for an experienced servicer. Figure on $10 or so for parts plus the local labor rate.
This unit is in protect mode. This means that a problem was detected in the last stage of the amplifier section and the unit shuts down to prevent further damage. The most common failure parts are the output transistors. These usually run between $5-$15 each. Add in the local labor rate for the total repair cost.