Yamaha Electone EL-87 Owner's Manual page 71

Registration numbers cannot be entered beyond the the
Registration Shift function's capacity of 80. The
following message momentarily appears when the 80
spaces have been filled:
First delete unnecessary registrations, then perform the
operation again.
Resetting the Electone to the Factory Preset (Power On Reset)
All current settings including Registration Memories, User voices
and User rhythms can be deleted at once by using the Power On
Reset function.
To reset the all settings:
1
Turn off the power.
2
While holding down the top left Data Control button, turn the
power back on.
Turning the Electone off erases all panel settings you have made.
When the Electone is turned on, Basic Registration 1 is
automatically selected. If you have made panel settings you wish
to keep, save them to Registration Memory before turning the
Electone off. You can, however, restore the panel settings that
were made before the Electone was last turned off. In doing this,
first be careful NOT to press any panel buttons (excepting those in
Basic Registration) after you turn the Electone back on. Then, to
restore the previous settings, hold down the M (Memory) button
and press D (Disable) button.
Be careful when using this operation,
since it erases all your existing data.
Always save your important data to a
floppy disk using M.D.R. (see page 68)
in advance.
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