angelie

AFfluent Poster
Hey,
Sorry to hear you almost lost your equipment.
And that my response is a bit late.
I didn't noticed this post....
I think with the transformer a capacitor or two has been blown up / damaged.
These things can handle some voltage but if you feed them to much voltage... they die.
Capacitors function is to make the dc voltage after a diode bridge smoother. To much fluctuation in the DC voltage causes a hum in the signal amplifiers...
If one or more capacitors are damaged you will hear a hum / noise from the equipments output because the dc voltage is no longer smooth enough..
I expect the capacitors right after the diode bridge or even the one directly over the mains input is gone...
- Angelie
It's not about what you got to use .... but how you use what you got...
[ Post last edited on 09/16/2018 at 13:30:52 ]
AudioFantastic

New AFfiliate
I expect the capacitors right after the diode bridge or even the one directly over the mains input is gone...
I have the same problem with buzzing DBX286
A (that's "S" in its older reincarnation). Almost no experience with soldering, but willing to give it a go. Would you be able to provide some additional details?
Here is the general schematic from the user manual:
Actual service schematics are available here:
https://dbxpro.com/en-US/product_documents/286a-project-1-schematicszip
I am not sure about the exact revision of mine as it's not written anywhere outside. It has the following marking on the side:
DBX286A-EU 100592 Sep 99
This strongly suggests the latest, A4 revision.
@angelie, could you give an idea of which capacitors need to be replaced with what?

Will post photos of its PCB, etc.
[ Post last edited on 05/23/2022 at 08:00:57 ]