Casio WK-3500 keyboard replacement board
casio wk-3500
repair manuel to replace connection board to A/C adaptor
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@pat23540 essentially the WK 3xxx are all pretty much identical in the disassembly. This one here is WK 3700 specific but will work for your model as well. Just take your time and check the connectors, ribbon cables and all before removing parts to quickly, just in case there will be minor variations
or if you prefer the written ones Casio WK 3xxx SM
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@pat22540 Can you upload pictures of the board? Adding images to an existing question
crwdns2934271:0crwdnd2934271:0 Andrew S crwdne2934271:0
just got pics
crwdns2934271:0crwdnd2934271:0 Pat crwdne2934271:0