RIP MarkOne's Alesis Fusion

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Re: RIP MarkOne's Alesis Fusion

Post by BillB »

PW, thanks for the helpful suggestion and welcome to the SOS Forum.

Is there somewhere on the InBrands website where these spares are listed, or did you just happen to have come across this info by coincidence?
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Re: RIP MarkOne's Alesis Fusion

Post by pw »

i bought one for an mpc5000 which has the same psu
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Re: RIP MarkOne's Alesis Fusion

Post by Jokeyman123 »

Old posts here, but if interested take a look at the alesis music user group-we have some interesting new info re power supplies-I have restored 2 dysfunctional 8HD's I purchased recently which now work perfectly. InMusic in the US got me a replacement mainboard-wiring is not a mess, look inside for yourself. Makes my SY77/Generalmusic/Ensoniq boards inside look simple! we have someone trying to design and build a new PSU. also alot of info about installing new hard drives, new screens-look for parametric, Jesse and Jokeyman plus many more very knowledgeable musicians who advanced this seemingly trouble-prone workstation.
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Re: RIP MarkOne's Alesis Fusion

Post by Martin Walker »

Hi Jokeyman123, and welcome to the SOS Forums! 8-)

Thanks also for the useful info - just in case, here's the link to the Alesis Fusion User Group:

https://www.alesismusic.com/index.php

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Re: RIP MarkOne's Alesis Fusion

Post by DGL. »

Look on RS/CPC/Farnell for an enclosed? PSU, the -16 can be had quite easily as it should be in the adjustment range of a +/-15V supply and the 12V supply can be created via the now +16V, plenty of switching blocks a available to do the job.
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Re: RIP MarkOne's Alesis Fusion

Post by fusioneer »

I'm in NYC, and just developed a power loss on my left output of an Alesis Fusion 8. I've used almost nothing else except when recording for a decade. Best feel and sounds around, and I'm used to it. Only trouble--I can't seem to get a good mono organ patch out of it. At slow speed, the panning becomes volume changes. The right channel's working fine, and soundmen like mono better. However, I plan on fixing the left output. [It's strange, there IS FX coming from that side, just not dry signal! WTF] Anyone got any ideas, or know a key repair guy in New York area?
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Re: RIP MarkOne's Alesis Fusion

Post by resistorman »

fusioneer wrote: Sun Jul 03, 2022 11:25 pm I'm in NYC, and just developed a power loss on my left output of an Alesis Fusion 8. I've used almost nothing else except when recording for a decade. Best feel and sounds around, and I'm used to it. Only trouble--I can't seem to get a good mono organ patch out of it. At slow speed, the panning becomes volume changes. The right channel's working fine, and soundmen like mono better. However, I plan on fixing the left output. [It's strange, there IS FX coming from that side, just not dry signal! WTF] Anyone got any ideas, or know a key repair guy in New York area?

Have you tried a hard reset?
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Re: RIP MarkOne's Alesis Fusion

Post by N i g e l »

If this was an Alesis Micron I would say it was an output stage failure.
Looking at the service manual for the Fusion it could possibly be similar.

There are transistors which short the output on power up so that there is no click/whumph through your speakers. After power up the transistors disengage and normal service is resumed. If one of the transistors fails, the output will always be shorted to ground and sound from that channel will be muffled/attenuated/distorted.

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Re: RIP MarkOne's Alesis Fusion

Post by resistorman »

N i g e l wrote: Mon Jul 04, 2022 7:32 pm If this was an Alesis Micron I would say it was an output stage failure.
Looking at the service manual for the Fusion it could possibly be similar.

There are transistors which short the output on power up so that there is no click/whumph through your speakers. After power up the transistors disengage and normal service is resumed. If one of the transistors fails, the output will always be shorted to ground and sound from that channel will be muffled/attenuated/distorted.

Image

Useful info, but they did say that there are EFX coming out, just not dry signal.
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Re: RIP MarkOne's Alesis Fusion

Post by N i g e l »

I took to it mean that the EFX signal was comming out as 100% wet rather than dry+EFX mix. The EFX signal would be at a lower level and seem to pass over the mute Transistor ok.
I also had that on my Yamaha hard disk recorder which uses a similar circuit.

I think we need more detailed info from the o/p. Is the output fine when its sent to the aux out instead of the main out ?
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