Hi there
I have acquired a used ISA 220 about 3 years ago. Since a few weeks, the signal on the unit started to die randomly. No signalprocessing active, only using it as a preamp, the signal dies away in a not too loud farting-noise in about one second and the vu-meter isn't moving anymore. So i decided to open it up and have a look. What i discovered, are two bloated caps near the output xlr. their top isn't flat, but convex. you can't see it that well on the attached image, but they are the only ones looking like this on the whole pcb.
Now i am quite an amateur in troubleshooting electronics. I have built several microphones from poctop, kits from capi, soundskulptor, jlm etc.. all working flawlessly. but that's like putting together some lego, as you know. So my questions are these:
- Should i replace only the two bloated caps and see, if the problems gone?
- Should i replace all the electrolytics, while i'm at it (around 100 electrolytics)? The unit might be around 15 years old...
Thanks for your help! Many regards, Joachim
I have acquired a used ISA 220 about 3 years ago. Since a few weeks, the signal on the unit started to die randomly. No signalprocessing active, only using it as a preamp, the signal dies away in a not too loud farting-noise in about one second and the vu-meter isn't moving anymore. So i decided to open it up and have a look. What i discovered, are two bloated caps near the output xlr. their top isn't flat, but convex. you can't see it that well on the attached image, but they are the only ones looking like this on the whole pcb.
Now i am quite an amateur in troubleshooting electronics. I have built several microphones from poctop, kits from capi, soundskulptor, jlm etc.. all working flawlessly. but that's like putting together some lego, as you know. So my questions are these:
- Should i replace only the two bloated caps and see, if the problems gone?
- Should i replace all the electrolytics, while i'm at it (around 100 electrolytics)? The unit might be around 15 years old...
Thanks for your help! Many regards, Joachim