Casio CTK-691, Руководство по обслуживанию

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10.Remove 19 screws and then the PCB ASSY (KY1M, KY2M).
11.Remove the rubber keys.
Note: Pay attention to the positions of the rubber keys as one of them has a different length.
Match the projections of the rubber keys with the holes of the lower case when reassembling.
Projection