Hi everyone.
These days since i have the time, I started repairing again (if possible) this simple DBX 290 (prohect series) reverb unit. I have to admit that i don’t use it anymore so i can risk a bit more.
The problem is that there is a lot of hiss, the more effect is mixed with the signal (when it’s full wet it’s at its loudest).
I replaced the filter caps, but nothing changed.
The direct signal is very good and clean.
The op amps look good (voltage etc).
Could it be something with the converters? Crystal clock?
Which Ic should i focus around? Can i find direct substitutes of such ICs ?
I have to admit that i haven’t got much experience on servicing the digital side of equipment. I usually deal with analog side or power supply problems.
I attach a link to the schematics in order to make things more obvious.
https://jumpshare.com/s/hLJpABpqGydbKFEPb19K
Thanks in advance
These days since i have the time, I started repairing again (if possible) this simple DBX 290 (prohect series) reverb unit. I have to admit that i don’t use it anymore so i can risk a bit more.
The problem is that there is a lot of hiss, the more effect is mixed with the signal (when it’s full wet it’s at its loudest).
I replaced the filter caps, but nothing changed.
The direct signal is very good and clean.
The op amps look good (voltage etc).
Could it be something with the converters? Crystal clock?
Which Ic should i focus around? Can i find direct substitutes of such ICs ?
I have to admit that i haven’t got much experience on servicing the digital side of equipment. I usually deal with analog side or power supply problems.
I attach a link to the schematics in order to make things more obvious.
https://jumpshare.com/s/hLJpABpqGydbKFEPb19K
Thanks in advance
Since the link doesn’t work, here is an attached version of the schematics.
If somebody needs them i have pcb pictures and recorded mp3 of the noise.
Thanks for your time
If somebody needs them i have pcb pictures and recorded mp3 of the noise.
Thanks for your time