Yamaha PSR-S950 Owner's Manual - Page 96
Troubleshooting
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Troubleshooting Overall A click or pop is heard when the power is turned on or off. Noise is heard from the instrument's speakers. There is a slight difference in sound quality among different notes played on the keyboard. Some Voices have a looping sound. Some noise or vibrato is noticeable at higher pitches, depending upon the Voice. The overall volume is too low or no sound is heard. The sound is distorted or noisy. Not all simultaneously played notes sound. The keyboard volume is lower than the Song/Style playback volume. The Main display does not appear even when turning the power on. Some characters of the file/folder name are garbled. An existing file is not shown. When the power is turned on, the message "The USB storage devices cannot be authenticated" appears. Electrical current is being applied to the instrument. This is normal. Noise may be heard if a mobile phone is used near the instrument or if the phone is ringing. Turn off the mobile phone, or use it further away from the instrument. This is normal and is a result of the instrument's sampling system. The master volume may be set too low. Set it to an appropriate level with the [MASTER VOLUME] dial. All keyboard parts are set to off. Use the PART ON/OFF [RIGHT 1]/ [RIGHT 2]/[LEFT] button to turn it on. The volume of the individual parts may be set too low. Raise the volume in the BALANCE display (page 53). Make sure the desired channel is set to ON (pages 52, 57). Headphones are connected, disabling the speaker output. Unplug the headphones. The [FADE IN/OUT] button is on, muting the sound. Press the [FADE IN/OUT] button to turn the function off. The volume may be turned up too high. Make sure all relevant volume settings are appropriate. This may be caused by certain effects or filter settings. Check the effect or filter settings and change them accordingly, referring to the Reference Manual. You are probably exceeding the maximum polyphony (page 99) of the instrument. When the maximum polyphony is exceeded, the earliest played notes will stop sounding, letting the latest played notes sound. The volume of the keyboard parts may be set too low. Raise the volume in the BALANCE display (page 53). This may occur if a USB flash memory has been installed to the instrument. Installation of some USB flash memories may result a long interval between turning the power on and appearance of the Main display. To avoid this, turn the power on after disconnecting the device. The language settings have been changed. Set the appropriate language for the file/folder name (page 16). The file extension (.MID, etc.) may have been changed or deleted. Manually rename the file, adding the appropriate extension, on a computer. Data files with names of more than 50 characters cannot be handled by the instrument. Rename the file, reducing the number of characters to 50 or less. If a protected Expansion Pack is installed to the instrument, in order to use the Voices or Styles contained in the Expansion Pack you need to connect the USB flash memory which was used for installing. Connect the proper USB flash memory to the instrument and turn the power to the instrument on again. 96 PSR-S950/S750 Owner's Manual