RCA 100 - Page 5

12.
Slip one coil
over
the free end
of
the armature and
then
slip the second coil
off the
armature
and stylus. All parts
before
re -assembling should be thoroughly
cleaned
and freed from
all traces of
dust or
dirt and metal filings, etc. Use
a
brush
to
remove
foreign
matter from
the parts. Avoid the use of liquid cleaners
as
they often
induce
corrosion.
The re -assembly
should
be
a reversal of the operation
just described.
1.
Place
the coils
"P" -"P",
Figure 11,
in
proper position around the
armature.
The small
length of wire
connecting
the two
coils in series
should be at the outside of
each coil
when
assembled, "L", Figure
11.
2. Place
the coils
with
armature in
position
onone
of
the motor side pieces, Figure
12.
Place the other motor
side pieces
in place
and screw the assembly together
by
means
of
the screw. In making
this
assembly
make certain that the
small pins
"M", Figure
12,
projecting from
the inner side of
the motor
side
piece,
separate the
two
field coils
as
shown
in
"B",
Figure 12.
3. Place the thrust
lever in position
and
screw it
in
place "d", Figure 2,
but, do
not solder to
the
stylus
at this
time.
4.
Replace the
armature
screws
"C", Figures
4
and 5, but do not
seat them firmly.
5.
Insert the spacer
tools (Figure 3)
in
position
at
the
top and bottom of
the
armature
and tighten down the
armature screws
as described
for
adjusting
the armature
in Part
I
of
these instructions.
6.
It will
sometimes happen that in
tightening
the armature screws
the
armature
may
be strained
slightly and when the spacer tools
are removed the
strain causes the
armature to spring
out of the central position. Remove
the spacer
tools and note
care-
fully whether
or
not the
armature is centered
between
the pole pieces. If not repeat
operation No.
5.
7. Remove
the
keeper
and place the
motor
in
position
on the
horseshoe
magnet.
Before seating
the screws "H", Figure
10,
that
hold the
motor
to the
magnet
push both
sides of the
motor
down
toward
the curved part
of the magnet. The motor should be
horizontal
with respect to
the sides of the magnet.
8.
Replace these assembled
units
on
the
Loudspeaker frames.
Place the connecting
rod
through
the cone. Place the lower
supporting
strap "N", Figure
9, in place and
tighten
screw
"G"
until the unit is held
in position, but not firmly.
9. Adjust the
position of the
unit until
the
connecting
rod
in passing through the
center
of the cone does not
exert a
vertical
or horizontal
pressure
on the
cone.
10. Seat the
screw
"G"
holding
the lower
strap "N", Figure
9, and
then fasten
the
upper portion
of the unit to the frame
by
means of the
nuts "FF", Figure 10, on
the
upper screws
"HH". When tightening
these last
two mentioned
nuts
be careful not
to
disturb the central
position
of
the unit
as established in 9.
11. Lock
the cone to the
connecting
rod by the nut provided
for that purpose.
The thread
on this nut has
a pitch of
80
threads to the inch and it
may be stripped
very
easily if
too great a pressure is
applied
to
it.
12. Solder
the stylus to the thrust lever
(Figure 1).
13.
Reconnect the leads to the
binding post.
14. Test
the loudspeaker and if further
adjustments are necessary
follow the pro-
cedure
outlined in Part I of these
instructions.
7
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