Hi guys.
I’m trying to troubleshoot an issue in a digital reverb circuit that’s driving me nuts. Here’s the schematic. Hope you could give some advice.its the reverb effect section of a musical instrument amplifier.
The unit worked great until one day it began making a harsh noise which was produced by u202 , a bd3201 reverb SoC. I didn’t have a scope at the time and decided to replace it. Hearing at the symptoms someone said probably the DRAM inside the bd3201 had failed and was making errors. After replacing the noise went away, but u202 is not outputting any signal and I’m not getting any reverb sound at all. Dry signal works as expected and the amplifier is usable, but without any reverb effect to it.
Now I have a scope available so I could troubleshoot this further, but I’m quite a newbie in digital circuits and don’t know where to start. I’d like to check mostly if the adc u201 before the reverb chip is outputting the digital converted input signal and whether the bd3201 is receiving a good digital input signal . My scope also has a function generator , so I can inject say a 500hz signal to the amplifier, for testing.
What should I expect to see when probing the adc output pin and the bd3201 input? Any other troubleshooting advice I could perform to trace down the problem is strongly appreciated!
Thank you all.
Cheers
Fran
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