Kjell@lemmy.worldI have a problem with the receiver for my 5.1 system.
When I turn it on, the speakers start making a popping sound that continues for a few minutes. I have tried disconnecting the speakers and using different ones, as well as different inputs, but the issue remains the same. The popping lasts for a shorter time if the receiver has been turned off for a while. Initially, it only lasted a few seconds, but it has gradually got worse.
Watch the video to hear the sound. In the video, I have only connected one speaker.
The receiver is a Marantz NR1501. I’m not sure when I bought it, but I found a review from 2010.
I opened the receiver and inspected it, but I can’t see anything burnt, and all the capacitors look OK. ImageImageImageImage
Do you have any idea what the issue is? How can I confirm if that is the root cause?
NaibofTabr@infosec.pub 1 day ago
You’re going to have a hard time pinning this down to a specific component without a circuit diagram. I did find that there’s a service manual for this unit: elektrotanya.com/…/download.html
Seems to be legitimate and has diagrams.
I would recommend starting on the output side - is the popping present on every speaker output? Both left and right? Use a very simple speaker for this, one that doesn’t require its own power source, just a red and black wire. Also, is the popping present with no input audio?
If you can narrow it to a certain output you can backtrack it to a specific section of the circuit that feeds that output. Alternatively, if it’s present on all outputs then it must be a component that is common to all, and therefore behind the area that splits to the different outputs.
An oscilloscope would be handy - you could identify the faulty signal at the speaker output, then check points along the path backward. Half-splitting is your friend. You don’t have to buy an expensive piece of lab equipment, a cheap $30-40 digital oscope will be good enough.
Another option would be to throw parts at it. I see units listed for parts on eBay for ~$80. You could try swapping out circuit boards one at a time.