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V (vibrato) 1 to 3 and C (chorus) 1 to 3. NOTE. Simultaneously press the ... M EFFECT 1 [ON/OFF] button. EFFECT 2 [ON/OFF] button. EFFECT [DEPTH] knob.
https://es.yamaha.com/files/download/other_assets/2/1547682/CK88_owners_manual_En_E0.pdf
DO NOT connect this product to any power supply or adapter other than one described in the manual, on the name plate, or specifically recommended by Yamaha.
https://es.yamaha.com/files/download/other_assets/1/317961/PSRK1E.pdf
1 Remove fuse cover and fuse. 2 Fix new fuse which should be a BS1362 5 Amp,. A.S.T.. 3 Refit the fuse cover. ... 9 Do not use force on switches, knobs and/or ...
https://es.yamaha.com/files/download/other_assets/9/321469/BD-S1067_G.pdf
https://es.yamaha.com/files/download/other_assets/8/323668/BD-S671_G.pdf