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DENON ADV-500SD power supply faulty, can you please guide me in the right direction, of the common componet falures... I am a car audio repair technician.. Many Thanks

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Check the caps on the 12v 5v side

Posted on Aug 28, 2008

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I have a old denon avr-1804. try to switch on power but can not. just appear a main power red light flashed rapidlly. please tell me why?

the red flashing LED is that the Device is in protection mode.
the internal power supply . +15 volts and -15 volts are defected you need to be replace it ... Regulators 7915 and 7815 .... these you should change , might also need to check capacitors .
these are common defects for Denon . AVR units.
Good Luck
Hope this helps

May 26, 2016 | Denon Audio Players & Recorders

7 Answers

Denon AVR 1804 Switch on and the display comes on but goes out after about 10 seconds. Whilst the display is on, the on/standby light flashes. After the display goes out the on/standby light still flashes...

I fix these receivers for a living and can tell you with certainty that the problem you have is one that will require the replacement of several parts. You will need to know how to solder and be able to purchase the proper parts.

There are 3 different most common reasons that they go into the protect mode, which is what is happening to your unit now.

1. Has a blown output channel in the amp that will require the replacement of both output transistors of the bad channel and the replacement of several resistors and a coupld of other transistors and a capacitor in the affected channel. You wil lneed a multimater to be able to check and findout which channel is bad. I can supply you with the part numbers you will need for the repair if you plan on doing it yourself.

2. A voltage regulator in the power supply is bad. They have several voltage regulators and it is a common problem for one to go bad. Once again you will need a multimeter to check and find which one it is and then get the part and replace it. I can supply the part numbers for you if needed.

3. A resistor that supplies the amplfier circuit has opened up and needs to be replaced. This is the least expensive repair, but not as common as the other two. Only one resistor would need to be replaced. You need a multimeter to verify that it is bad, I can tell you which resistor to check and loet you know by the readings with the meter if it is bad.

Those 3 problems are the most common reasons for the receiver to shut down like your is doing. I work at an authorized Denon repair center and have repaired hundreds of Denon recievers so I am certain that the problem you have is one of these three listed.

Let me know if you plan on trying to fix this yourself and I will guide you thru the repair and even email you the service manual for a reference to do this repair. It is not an easy job, but it is the problem you are having. As I said before, I fix these receivers all the time myself, and I know how to fix them. Let me know if you want further help with this.


Sep 03, 2008 | Denon Audio Players & Recorders

1 Answer

AVR-1802 5.1 Channels Receiver: My Denon AVR-1802 LED is flashing rapidly. I have...

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.

hope this helps?

May 16, 2010 | Denon AVR-1802 Receiver

2 Answers

No video on Denon 1508

Coax-2 is audio. Where's the video from the cable tuner coming into the Denon?

Why don you need the cable to pass video through the Denon on iuts way to the TV anyway? Interconnnects rarely add value.

May 08, 2010 | Denon AVR-1508 Receiver

1 Answer

"PROTECT" appears on my DENON DHT-500SD

Sounds like a speaker wire is shorting against either another speaker wire or something metallic. Check your speaker wires to make sure they're not shorting (touching). If that doesn't work, I'd take it to a repair facility. Good luck!

Feb 16, 2010 | Denon DHT500SD System

1 Answer

Denon DHT-500SD system and want what is on TV to come through 500

You could try the optical route. You should be able to use the analog RCA audio outputs of the TV to the analog TV or VCR audio inputs of the receiver as well. Select the appropriate input on the receiver and you should have TV audio.

Jan 02, 2010 | Denon DHT500SD System

1 Answer

Denon adv-700 - Mech error

try to disconnect your system from power and connect it again.

Sep 06, 2008 | Audio Players & Recorders

1 Answer

Denon adv-500sd protect mode

speaker wires are short curcuited

Apr 13, 2008 | Audio Players & Recorders

1 Answer

Denon 500SD

did you get this fixed? I have the same problem. Stuck on stand by doesnt switch on from remote or the unit.

please help

Dec 28, 2007 | Denon DHT500SD System

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