Fuse and cord are not the issue. What is best way to trace a faulty circuit/board
The answer is you can't. These units are unfixable except by a factory authorized service center.
The reasons are legion, But include: -
No service manuals or circuits are published. That pretty much stops you right there.
Surface mount components installed by robots using hot air soldering. So that makes repair only by board replacement.
Installation of proprietary boards requiring proprietary software, such as rebooting BIOS for instance. A lot of software manipulation goes into repairing these types of units as a rule.
Law requires that parts only be available for seven years, but if the production run, runs out, which it virtually always does, then that gives them an out.
So what I am telling you is that, your receiver is now unfixable junk, and has to go to the recycling center.
If you want gear that you could learn to fix, then you have to go vintage and way back.
This is why I keep and use as much really good vintage gear as I can. I can and do repair it, but it seldom needs it.
I have had a costly AVP fail at five years, that Marantz could not fix. That was a Marantz 7705. Its replacement the Marantz 7706 failed at three months and is in for warranty repair. I have heard nothing and if I don't hear from them before the labor day weekend, I will start enquiries.
So I bought a really costly Marantz AV 10. My needs can be met by way less than a handful of units. So I had no choice.
So this is the current state of the industry and if you think it is unacceptable, then I agree.
