Denon Audio Players & Recorders - Recent Questions, Troubleshooting & Support
Denon AVR 1804
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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.
on Feb 27, 2019
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