G. Radio Interference
The model 3 automatic motor is well filtered with condensers (69 and 140) to
reduce and eliminate radio interference, and will give satisfaction in the
great majority of homes. Local conditions in some places, especially in
communities some distance away from radio stations, in cases where indoor
aerials or long unshielded “lead-ins” are used, in short wave reception, etc.
may cause motor static to be heard. A motor that is entirely satisfactory in
one home may interfere to some extent when used in another home where those
exceptional conditions exist. If the user wishes to overcome extreme
conditions and is willing to go to some additional expense in doing so, the
factory can supply a supplementary filter that will be effective in some
homes. The supplementary filter plugs onto the wall plug that is attached to
the end of the motor cord. When ordering ask for Radio Filter Plug C24Y.
(Note: Filter plug C24Y can be used with model 1 automatic motor also, but the
circuit in the motor must be changed first. For this change, return motor to
factory.)
H. If there is no change in speed when the switch knob is moved between speeds 8,
9 and 10 - while the motor is running idle - the cam rise on the speed
adjustment switch knob (70) is too great. See Section F-l. Replace switch knob
with later type 11X, which limits high speed to 1000 R.P.M.
J. Motor Jerks When Running, Especially On Low Speeds
J-l. Speed may be set too low. Reset according to Section B-11.
J-2. When speed has been adjusted according to Section B-11 and motor still jerks
when running: -
J-2a. Governor tungsten
contact points may be dirty or pitted. A film of oil on
surface of governor contact points will also cause motor to jerk. Remove rear
motor cover (128) as described in Sections A-1 and A-2. Spring back the blue
steel governor diaphragm so that the tungsten governor points are exposed (but
do not pull diaphragm back so far as to cause it to set permanently in a new
position). Then rub both contact points with file (Auto Distributor Point
File) for cleaning contacts, until all roughness, dirt or oil has been
removed; or if surfaces of contacts are badly pitted, replace governor
assembly (100). Check the cups fitted around the points to see that cups do
not rub or catch anywhere, and see that contact points are centered. Also look
at governor condenser leads (140) and make sure these are connected securely
with tight binder screws (122). Then put on the rear cover and try motor. If
unevenness, or jerk, has not been eliminated, take off rear cover (128) again,
remove governor assembly (100), and fan housing (135) as described in Sections
A-2 to A-4. Inspect fan (133) to see if it is held tight on armature shaft
with fan retaining nut (l34). If fan is loose tighten nut against fan as much
as possible and reassembly motor.
J-2b. The
governor diaphragm (138) may be rubbing against sides of Bakelite disc.
There should be an approximate clearance of .010 inch between the edge of
diaphragm and the Bakelite. If the diaphragm is rubbing, press or push
diaphragm into the proper position with a screw driver having a fine blade, or
if necessary replace governor.
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