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02.05.2021 5:02:11
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Hey everyone, I've got a subwoofer that doesn't function properly, and I suspect it may be the plate amp. Here's a rundown of the symptoms and the tests that I've performed: [links]
A service manual if you can get one is very helpful. here
Now I know that I could just order a plate amp for $100 and move on, but I'd rather not spend the money when there is likely just one component in the amp that has failed. I'm looking for advice from people who have encountered a similar issue, and what component they suspected was the cause. I'm an electrical engineer, so I have access to plenty of tools, measurement devices, and soldering equipment. Unfortunately, amplifiers were never my strong suit in school, so I can't speculate what might be causing the volume problem that I'm having. Maybe a bad op-amp? Broken feedback loop? [links]
If it is a class D amp, and most plate amps are, they are very difficult to service. If the problem is in the switching power supply of these units, and it usually is, they are virtually impossible to service, and not worth the time. more
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka. here
These ICs can actually breakdown when under load so checking them with an Ohmmeter will not guarantee that they are good. The best is to replace them and retest.
If you want to learn how to be good in switch mode power supply repair you can check out Jestine Yong’s SMPS repair ebook HERE.
Once the cover was removed, I could see the power supply and the amplifier circuit board. The main fuse did not blow so this means usually the bride diodes were also good. here
The first thing I do was to test it first before opening the cover. Yes, it was indeed no power and I had to open the cover to repair it.