Troubleshooting - Yamaha Electone EL-87 Owner's Manual

Troubleshooting

Please note that the appearance of any of following phenomena does not indicate a mechanical failure of the
Electone.
Problem
GENERAL OPERATION
Some of the LEDs in the DISPLAY SELECT
section do not light.
No sound is produced from the Electone's
speakers.
A cracking noise is sometimes heard.
Interference from radio, TV, or other sources
occurs.
The sound of the Electone causes surrounding
objects to resonate.
The Electone panel does not function normally
or the content of the memorized data has
changed.
VOICES/RHYTHMS
When selecting a dotted button voice or rhythm,
the voice or rhythm title at the top of the LCD
does not match the voices or rhythms.
When too many keys are pressed, not all of the
notes sound.
When playing a Pedal voice from the Lower
keyboard (using the To Lower function),
pressing the Lower keyboard's Sustain button
does not turn on Sustain.
The sound is too soft, despite the volume being
set to the maximum.
Switching voices causes the volume to change,
despite their having identical volume settings.
When keys on the Lower keyboard or
Pedalboard are pressed, the sounds of percussion
instruments are also heard.
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Possible Cause and Solution
The LEDs of on/off buttons [UPPER/LOWER FLUTE VOICES, VOICE
EDIT, RHYTHM PROGRAM, and TREMOLO (FAST)] are lit when
those functions are turned on. The LEDs of other function's buttons
momentarily flash when the functions are selected.
The plug of the cable from the speaker unit is disconnected. Refer to the
separate "Assembly Instructions," and reconnect the plug securely.
Noise may be produced when either an electrical appliance is turned on
or off, or an electric power tool (such as drill) is used in the proximity of
the Electone. If this occurs, plug the Electone into an electrical outlet
located as far as possible from the device that seems to be the source of
the problem.
This is caused by the proximity of a high-power broadcasting station or
amateur ham radio setup.
Because the Electone is capable of producing powerful bass sounds,
resonance may be caused in surrounding objects, such as cabinets or glass
windows. To avoid this, relocate the objects or lower the Electone's
volume.
This happens very rarely. Occasionally, power surges and spikes due to
electrical storms or other reasons may cause the Electone to malfunction
and/or alter the contents of memorized data. If this happens, perform the
Power On Reset operation to reset the Electone. (See page 67.)
The currently assigned voice or rhythm is displayed at the top of the LCD,
and remains until another voice or rhythm has been selected. (See page
26.)
Total polyphonic capacity (notes sounding for both Upper and Lower
Keyboards) is 14 notes. Polyphonic capacity is 12 for both the Upper and
Lower Flute Voices, and 6 each for the Upper and Lower Attack sound.
Even though the Pedal voice is being played from the Lower keyboard, it
is still a Pedal voice; turn the Sustain on with the Pedal Sustain button.
Check all of the volume controls, making sure that they are set to suitable
levels: the panel Volume controls for each voice section, the Master
Volume dial, and the Expression Pedal.
Also check the Upper/Lower Balance control on the Voice Display. (See
page 24.)
The volume of certain voices may seem lower than that of others. Adjust
the balance of the sound with the Volume control within the appropriate
Voice Condition display.
The keyboard Percussion function has been turned on. When not using
the function, be sure to furn it off. (See page 59.)