Yamaha PSR-79 Owner's Manual - Page 42
Troubleshooting - electric keyboard
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Troubleshooting Problem Possible Cause and Solution When the PortaTone is turned on or off, a popping sound is temporarily produced. This is normal and indicates that the PortaTone is receiving electrical power. The sound of the voices or rhythms seems unusual or strange. The battery power is too low. Replace the batteries. (See page 9.) There is no sound even when the keyboard is played or when a Song is being played back. Check that nothing is connected to the PHONES/AUX OUT jack on the rear panel. When a set of headphones is plugged into this jack, no sound is output. When one of the PIANO styles is selected and started, the rhythm cannot be heard. This is normal; the accompaniment of the style can only be heard when accompaniment is set to ON and keys are played in the ACMP section of the keyboard. Not all notes are heard when playing a number of notes simultaneously. Too many keys are pressed at the same time. The PortaTone is polyphonic up to a maximum of 16 notes. The Pad sound is cut off or sounds unusual. The PortaTone is polyphonic up to a maximum of 16 notes. If a style or song is playing back at the same time a Pad is played, some notes/sounds of the Pad may be omitted (or "stolen") from the accompaniment or song. The sound of the voice changes from note to note. The AWM tone generation method uses multiple recordings (samples) of an instrument across the range of the keyboard; thus, the actual sound of the voice may be slightly different from note to note. The melody part of the song doesn't play. Check that Melody Guide is turned off. The song plays back to a certain point and then pauses. Check that Melody Guide is not set to "Waiting." The notes shown in the music staves and keyboard diagram in the display do not match the keys actually played. 42 When auto accompaniment is on, the display shows the specific notes of the chords you play in the ACMP section of the keyboard. If you play a single finger chord, or an inversion of a chord, the corresponding chord will be appropriately displayed - even if the display does not exactly match the pressed keys.