Sound Skulptor forums

Build help and troubleshooting => MP573 Microphone preamplifier => Topic started by: newsoulebel on February 20, 2021, 12:16:35 PM

Title: Scratchy noises/failing after about 10 seconds
Post by: newsoulebel on February 20, 2021, 12:16:35 PM

Hi JP. Hope you're well.
I have a customer who says his first Gen 573 starts making scratchy noises once it gets up to temperature.
Works for about 1 30 seconds then fails then doesn't deliver any audio. Just noise.
Can you point me to some basic troubleshooting? He was running it in a Midas L6.
But he has checked the other 573 in the lunchbox in the same slot and its working so he is very sure it is a problem with the preamp.
Best, Matt

Title: Re: Scratchy noises/failing after about 10 seconds
Post by: JPK on February 22, 2021, 03:53:27 PM

First check the unit in a lunchbox that has another module in. If the other module still works when the MP573 fails, then the issue is not in the lunchbox.

Quote

starts making scratchy noises once it gets up to temperature

This is often caused by a bad solder joint the gets worth when getting warm.
Try reflowing the joints around the power transistor.
Next, try to follow the signal (https://www.soundskulptor.com/forum/index.php?topic=5.msg5#msg5) when it fails.