HOW TO SERVICE MODEL 1 AUTOMATIC MIXMASTER
1.
If Mixmaster does not run when electric cord is plugged into an outlet of
the same voltage shown on the motor name plate, detach the cord from the
socket and remove switch cover (see Key #71 on the general diagram at the
end of this bulletin) by taking out the two screws (90 and 65); then plug
the cord into the socket again and with a piece of wood press down on
phosphor bronze switch (105), taking care to keep the wood clear from
rotating governor disc (100). If mixer should start that is an indication
that switch rod and bakelite insulator (115) is short and should be removed
from switch cover and a new one installed.
If, on the other hand, the motor should not start when pressing down switch
part (105) remove the governor disc assembly (100) and install a new
governor disc as outlined in sections 5—A and 13—B. Then close the switch
again as mentioned above. If motor still does not start proceed as follows:
1—A. Reassemble original parts (see sections 14.A and 15) and check for
continuity of circuit with a test lamp. Place tips of tester wires on each
prong of the appliance plug at the end of the cord. If the lamp (50W) lights
to nearly normal brightness with the mixer control knob in any position
other than “OFF” it indicates that the electric circuit is complete and the
motor should run, otherwise the bearings may be tight--see section 3. If the
lamp does not light the circuit is open, and a complete test should be made
of the electric cord as in section 2. If light is illuminated to
approximately half normal brightness, that indicates that the motor circuit
proper is open and current is flowing through resistor (43) only--proceed to
take motor down as in sections 5, 5—A, 5—B and 6 and test armature (27) and
field coils (44), for open circuit, also inspect brushes (19) and brush
springs (18).
2.
Testing and Replacing the E1ectric Cord (33)
Take out screw (87), remove cover (84) arid rubber insulation (95) and pull
out connections from terminal insulation box. Place test tip on one of these
connections and the other tip on first one prong of the appliance plug and
then the other. One of these wires should light; if it does then move test
tips over to the other connection in terminal box and to the other prong of
the plug. A light should be obtained there also if the cord is in good
order. If either one of these wires do not light thru, cord should be
replaced.
2—A. Next, use a hot soldering iron and pliers, untwist the terminal leads and
detach cord. Attach a new cord and plug and twist and solder leads. No
taping of the leads need be done but fold leads carefully into terminal
insulation box (96) so they do not touch the case. Replace rubber insulation
(95) cover (84) and screw (87) and test mixer for ground by touching first
one terminal prong of plug on cord with one tip of test lamp, and the other
test tip on the motor case. Then move over to the other prong of the plug.
The lamp should not light. If it does go back and check wiring.
