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thrust bearing
in
the center bottom spindle on which the
bottom
of
the platter spindle
rides,
and care should
be taken on
initial
installation, and likewise periodical servicing when removing the
platter, that the thrust bearing
is
not lost.
Normal maintenance,
keeping
the equipment clean, and impressing on
operators that even
the most rugged mechanical device will fail when improperly handled
will assure continued noise -free broadcasting
of
transcribed programs.
45
RPM ADAPTER KIT
(Used on
CB -11 Only)
The
45 RPM
Adapter
Kit consists of
a
brass bushing with
a
plug insert.
The plug slips
into the
33
-1/3 RPM spindle of the CB -11
turntable
chassis; also
a
center pin adapter
to
accommodate
the 45 RPM RCA
records.
Two holes have been
cut in
the top of the turntable platter
which
come
directly over
the
motor
spindle.
The
motor spindle will
be found on
a
direct line between the operating handle and the center
of the platter.
To use the Adapter
Kit,
merely turn the
1
-1/2" hole
so
that
it is
over the motor spindle and slip
the
adapter
into the
spindle.
Then place the record
adapter over
the
record pin
in the
platter.
To
operate, turn the operating handle
to
the
33
-1/3 RPM
position
and the
turntable will operate
at 45 RPM.
To go back to
33-
1
/3,RPM operation, merely remove
the
adapter from the motor
spindle and the record adapter from the platter and
the turntable
is ready for
operation
in
a
normal manner.
If
this
kit is
supplied
for
use with
turntable chassis which were shipped from
the factory
without this feature,
it
will be
necessary
to drill
a
1
-1/2" hole
in the platter in
accordance with the drawing supplied with the
kit.
Slight readjustment
of the idler
wheel yoke and tension spring may
be
necessary
to
obtain correct operation
at
all three speeds.
All
turntable chassis which are equipped
for
three -speed operation
at
the factory have been carefully adjusted for this operation.
IDLER YOKE ADJUSTMENTS
FOR
MODEL
CB -11
AND CB -21 TURNTABLES
First,
it is
necessary
to
loosen the large bolt which holds the
idler wheel bracket
in place.
Loosen this bolt just enough
to
allow
adjusting.
A
large screwdriver for the slotted
end
of the
bolt and
a
wrench for the
nut
are the tools you will need.
Adjust
the yoke
so
both idler wheels engage with the
motor drive pulley
just before they engage with the platter.
The
33
-1/3 RPM speed is the more critical of the two as
there
is
less driving surface on the motor
pulley
for
driving
the idler
wheel.
When adjusting the idler wheel for this speed, engage the
motor starting switch
in
the
33
-1/3
position
and start
platter
rotating.
Then stop platter with your fingers.
If the
wheel
is
properly adjusted, slippage should occur between the platter and
the idler wheel and not on the motor drive pulley.
After both wheels-are adjusted properly, tighten bolt holding idler
assembly, making sure assembly
does not slip in the process.
The
turntable should now operate properly
at
both speeds and also give
proper torque for satisfactory operation.
No
adjusting
of the
springs on the idler yoke
is
necessary unless tension
of
the springs
is weak.
If
more tension
is
required, this can
be
accomplished
by
moving
the two
nuts forward on the threaded shaft.
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