Yamaha Electone EL-900 Owner's Manual page 183

Problem
VOICE EDITING
During voice editing, the specified voice isnﾕt
heard, even when the keyboard is played.
Changing the Envelope Generator of the Carrier
(FM Operator) causes a timing gap in timbre
changes.
RHYTHM PROGRAM
During use of the Rhythm Pattern Program, no
sound is produced even when you play a certain
percussion sound.
MUSIC DISK RECORDER
Recording or playback cannot be performed.
A total of 40 songs cannot be recorded.
Recording is stopped before the performance is
finished, or the Song Copy function cannot be
executed.
The rhythm does not start at the beginning of a
recording, or stops in the middle of the
performance.
The notes of the recording are ﾒstuckﾓ and sound
continuously.
Possible Cause and Solution
The current settings keep the voice from sounding. Make sure that the volume
of the voice is set to a suitable level, and adjust the various parameters in the
Voice Edit display until the voice can be heard.
When you make a change in the Envelope Generator of the Carrier (how the
volume changes over time), do the similar change in the Envelope Generator
of the Modulator (how the timbre changes over time).
If percussion sounds have been recorded to all 16 rhythm tracks, no
subsequently selected instruments can be heard or recorded. If necessary,
erase one of the tracks and play the sound.
･ Problems in recording or playback may be caused by improper operation of
the M.D.R. Refer to the LED Display Messages chart on page 109.
･ The PLAY or RECORD section buttons for selecting parts may be turned
off. Turn on the appropriate PLAY or RECORD buttons.
If some song numbers contain a large amount of recorded data, the disk may
not have enough available memory left to record the normal maximum of 40
songs.
The amount of recorded data on the disk is close to the maximum limit. Either
use another disk or delete the data of any unnecessary song number.
The M.D.R. is designed so that the rhythm cannot be started at the very
beginning of a recording. If you wish to use the rhythm, start it after the
available memory display appears on the M.D.R. display.
During playback, you removed the disk by pressing the EJECT button.
Whenever you wish to stop playback, always press the STOP button.
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