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SECTION
I
HOW
THE
ORGAN
OPERATES
1-1.
GENERAL
-
This section contains
a
description
of the operating
principles
of
L—
100
Series
organs. Figures
1—1 and
1
-2
depict the locations
of
the various
subassemblies. Figure
1
-3
is
a
block
diagram.
1-2.
TONE SOURCE
-
Most
tone
sources,
such
as strings,
reeds,
or
pipes,
produce complex
tones.
The
Hammond
tone-producing
mechanism,
however,
generates individual
frequencies
which
can be
combined by
means
of
harmonic
drawbars
to
produce any
desired
tone
quality.
The
block diagram,
Figure
1-3,
shows
the chief
components
of
the instrument.
Electrical
impulses of
various frequencies
are
produced
in
the
"tone generator
assembly"
whicli
contains a
number
of
"tone wheels"
driven
at
predetermined
speeds
by
a
motor and
gear
arrangement.
Each
tone wheel
is
a
steel
disc similar
to a
gear,
with high
and low
spots,
or
teeth,
on
its
edge
(see
Figure
1
-4).
As
the
wheel
rotates,
these teeth pass
near
a
permanent
magnet,
and
the
resulting variations in
the
magnetic
field
induce
a voltage
in
a
coil
PEDAL
DRAWBAR
CONTROL
TABS
LOWER MANUAL
DRAWBARS
PILOT
LIGHT
OFF-ON
SWITCH
UPPER OR
SOLO
MANUAL
LOWER
OR
GREAT MANUAL
PEDAL'KEYBOARD
EXPRESSION
(VOLUME)
PEdAL
Figure
1-1.
L-
100
Console,
Front
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