Which of the following are good troubleshooting reference points for the Emerson
55-JS suction pump?
a. A1-2 and A1-3.
b. Pilot light 2 and tie point A.
A1 and M1-1.
d. Convenience outlets 3 and 4 and F1-2.
A clinician reports a problem with the 55-JS suction pump. The pump runs but the
motor does not turn. You inspect the brushes and Variac control, which are
functioning properly. You inspect the armature commutator and find it is dirty.
What corrective action do you take?
a. Replace the commutator.
b. Clean the commutator with #400 emery paper.
Remove the commutator and clean it with solvent.
d. Remove the commutator and clean it with Lubewick.
You are removing the Variac control to adjust the motor speed. You first unscrew
the Allen screw securing the control knob and remove the knob. What's next?
a. Tip the front panel toward you and slide the control sideways.
b. Remove the 12 screws holding the front panel in place.
Remove the four screws holding the control in place and push the control into
d. Remove the shaft nut and machine screw holding the control to the front
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