ice 50ASX2 repair (smd ferrite)

[g1]

Does anyone ever repair these modules? I know you are not supposed to, but I would think things like connector or main cap. solder joints or blown aux. power fuses should be repairable without charging the customer for a $100+ replacement module.

This one is in a Fender Rumble, the smd ferrite bead/block in the aux. power ground line has gone resistive. You can see it burnt a bit, and it measures around 400 ohms. The others in the +/-24V lines are zero ohms. The amp works but the aux. supplies are unbalanced. Putting a wire across the bead fixes the imbalance and the amp runs fine.
A bit of research and it seems to be a problem that occurs once in awhile. My guess it's caused by ground loops/faults connecting to other equipment, through the line out or something.

I suppose it is helping block HF noise from getting into the preamp circuits via the aux supply rails. So I think it should be replaced rather than just jumpered and am wondering if anyone has found a suitable replacement or knows what kind of specs. to look for. The fuses in the +/-24V rails are T400mA.

[The Dude]

I believe in the B&O Ice module 200AC, they used 4.7uH. These ought to be similar. I couldn't tell you current rating. If it's the coils I'm thinking of, they go to ground- a ground reference for the circuit? I think the circuit is fused anyway, so going a bit oversize wouldn't likely hurt anything that's not already damaged. The way I see it, what have you got to lose? I've never seen or heard of a schematic available anywhere, so I think you're on your own. There are enough Ice modules that get replaced, so maybe you could rob parts from a dead one if you could find one to cannibalize?

[g1]

These are in series with the connector for the aux. supply out. Little SMD rectangular blocks, but called 'ferrite beads'. Act like 0 ohm jumpers to DC I guess, but higher resistance to high frequencies. One for each leg of the aux. supply, +24, Gnd, -24. There are other actual inductors designated 'L', these are designated 'Fe', the bad one here is Fe101.
The recent dead one I had from another repair got returned with that unit. I figured a high dollar item like that I should return the bad part. I asked if it was still around, of course it got tossed a couple weeks ago.

[vintagekiki]

https://www.diyaudio.com/forums/class-d/281978-icepower-50asx2-btl.html

https://www.scribd.com/document/338956424/adi-final-C-ICEPOWER-200AC-Rev-D-ckt-pdf#download

http://www.hifi-forum.de/viewthread-71-11152-27.html

http://www.hifi-forum.de/viewthread-71-11152.html#1
^{ICEpower Verstärker}

[Jon Snell]

These are replacements that are widely used; https://uk.rs-online.com/web/p/multi...ctors/6041394/
They act as fusable links and RF interference filters.

[nickb]

These are in series with the connector for the aux. supply out. Little SMD rectangular blocks, but called 'ferrite beads'. Act like 0 ohm jumpers to DC I guess, but higher resistance to high frequencies. One for each leg of the aux. supply, +24, Gnd, -24. There are other actual inductors designated 'L', these are designated 'Fe', the bad one here is Fe101.
The recent dead one I had from another repair got returned with that unit. I figured a high dollar item like that I should return the bad part. I asked if it was still around, of course it got tossed a couple weeks ago.

They do have SM fuses in series with the AUX outputs on these. Could that be what you are looking at?

[g1]

They do have SM fuses in series with the AUX outputs on these. Could that be what you are looking at?

No, the fuses are F100 etc. The ferrites are Fe100 etc. They are like these SMD on this page: https://uk.rs-online.com/web/c/passi...ferrite-beads/

I just don't know what kind of resistance they should be at 25 or 100Mhz, which seems to be mostly what the important variable is. They are all basically shorts at DC.

Here you can see FE101 just in front of connector P103. (the fuses are under the silicone blob)

[DrGonz78]

I had replaced some and ferrite beads on a Roland cube 60. I used larger through size ones and didn’t think twice but that was not on a power supply. Has anyone ever contacted Ice to see if they can even tell you what the value is for those components?

https://www.icecomponents.com/power-designs

[g1]

Has anyone ever contacted Ice to see if they can even tell you what the value is for those components?

https://www.icecomponents.com/power-designs

Thanks. Can't hurt to try. I submitted my question.

[g1]

I had replaced some and ferrite beads on a Roland cube 60. I used larger through size ones and didn’t think twice but that was not on a power supply. Has anyone ever contacted Ice to see if they can even tell you what the value is for those components?

https://www.icecomponents.com/power-designs

Turns out that is the wrong ICE people. At least a very fine person got back to me and told me I had the wrong address. Re-directed question to:
https://icepower.dk/about/#contact

[The Dude]

I guess the .dk makes sense, since ICEpower started with Bang and Olufsen.

[DrGonz78]

I thought it was the right one. They probably have gotten that before. Glad you got the right one now.