Is [https://www.ebay.com/itm/203039952351?hash=item2f461fcddf:g:ftEAAOSwRvFfAV0w|this] what you mean?
Here’s the [https://www.manualslib.com/manual/997832/Akai-4000ds.html#manual|service manual] that may also help as it has all the part numbers so you may be able to find other suppliers by searching for the part number.
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=== Update (02/14/2022) ===
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Hi @Gunnar Carlman
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Strange that there are two different models with the same model number.
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Has your model got any other information on the product information label that is usually attached to the device which could identify it further as here's the [https://www.manualslib.com/manual/1021112/Akai-4000-Ds.html|Akai 4000DS Mark II service manual]
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If this looks more like your model it also has a parts list.
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Find the wanted part in the parts list and search online using the number "only" or if no good search for "Akai (insert wanted part number)".
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It's getting late here so I didn't have time to look through it ;-)
Hi,
Is [https://www.ebay.com/itm/203039952351?hash=item2f461fcddf:g:ftEAAOSwRvFfAV0w|this] what you mean?
Here’s the [https://www.manualslib.com/manual/997832/Akai-4000ds.html#manual|service manual] that may also help as it has all the part numbers so you may be able to find other suppliers by searching for the part number.