Has anyone had any success repairing B&O Icepower 200ASC 200AC modules? I have a handful of them all with various issues. no output, low output, half volume output, low 47V output etc etc. none of them have any visible issues like burnt parts, signs of stress etc. curious if these have common issues that are repairable or should i just toss them in the bin?
ZC
ZC
I have found low volume output to be the smt electrolytic 16v 10uf signal capacitor (C313) near the input connector.
47V output issue could be faulty TVS diode next to L201, newer versions use larger SMCJ48 (GFX marking instead of MX type).
Mine have a problem where they work fine with surge protection light bulbs in line with mains but blew the old MX TVC diodes as soon as 'full' mains applied.
I tried newer MX from Littelfuse but these wouldn't allow 47V supply to fire up fully.
Next I will try GFX.
I also replaced the 470uf 16V and 330uf 6.3V's as they were bulging/leaking (overheated).
I think capacitor types are fairly critical as replacing the 330uf's with 470uf low esr (Panasonic fr) I believe caused one of the small zeners to blow..
47V output issue could be faulty TVS diode next to L201, newer versions use larger SMCJ48 (GFX marking instead of MX type).
Mine have a problem where they work fine with surge protection light bulbs in line with mains but blew the old MX TVC diodes as soon as 'full' mains applied.
I tried newer MX from Littelfuse but these wouldn't allow 47V supply to fire up fully.
Next I will try GFX.
I also replaced the 470uf 16V and 330uf 6.3V's as they were bulging/leaking (overheated).
I think capacitor types are fairly critical as replacing the 330uf's with 470uf low esr (Panasonic fr) I believe caused one of the small zeners to blow..
Just wanted to say thank you @tony399 - I have a pair of Martin Logan Vantage hybrid electrostatics. The woofers have an internal 200ASC in each cabinet. One woofer was down about 5 dB and the other a whopping 15dB. I replaced C313 on both units and now they're bang on 0dB difference to each other.
Thank you very much!
Thank you very much!
I'm not sure about my answer, so I did a Google search for "B&O Icepower 200ASC 200AC modules" and got. Sorry for not being able to help you.