Electrical Projects one of the speeds is lower than it should be, or nonexistent altogether, the trouble is probably a loose connection at or in the switch assembly.



To check the diode:

• Remove the bottom panel and remove the diode from the selector switch.

• With the ohmmeter set at R x 1, attach the common lead of the meter to one end of the diode,and the other meter lead to the other lead of the diode. Read resistance. Reverse leads and read again. If diode is okay, one reading will be low, the other high.

To test the three-tap field motor, first remove the brown lead wire from the motor-brush terminal and attach one lead of the test cord to this terminal. Attach the other lead of the test cord to the blue wire on the speed-selector switch. Apply the specified 120V to the motor and observe the running operation. Remove power from the unit. Disconnect the test lead from the blue wire and attach it to the yellow wire on the selector switch. Again apply 120V to the motor. A significant increase in speed should be noticed.

Repeat the test with the test lead attached to the red wire on the selector. At this point, the motor speed should be faster than at either of the two previous connections.




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Febuaury 10, 2012