I have found an old concertmate 680 from a few years back. It was stored in near proper conditions as far as I can tell. I’ve tried to power it on using both the DC adapter and using batteries, but it won’t turn on. Does anybody have a potential solution I can use?
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Hi,
There is not much information out there about your model keyboard but I managed to find the service manual online, (if you wish to purchase it), which should be of some help as usually most service manuals have dis-assembly instructions and schematic diagrams
If there is no indication of power when the power is switched to On then you will have to open the keyboard and check the circuit from the power supply inputs, both battery and adapter (although they should common up somewhere near the power switch) to the power switch and then through the switch and further into the circuit.
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