The dental chair or lift will not operate. You are testing the probable cause of a
bent or broken lift control switch. What testing procedure do you use?
a. Remove the switch bezel from the chair and use a voltmeter to check for
appropriate voltage between terminal 2 and the neutral line.
electrical junction box for appropriate readings, 115v or 220v.
Visually inspect the component. Ensure contacts of the switch are intact and
d. Toggle the switch on the electrical junction box to the "auto" position.
If the chair or lift will not operate which of the following is the first level of testing?
a. Check receptacles on the chair electrical junction box for appropriate voltage
readings using a voltmeter.
b. Make visual inspection of all electrical plugs and power sources.
Toggle all switches to ensure they are on automatic.
d. Make sure programming dials are not loose on the potentiometer shafts.
What is the probable cause if two motors operate but only one programming dial
a. Faulty control board.
b. Automatic control switch is faulty.
Faulty potentiometer wiring harness.
d. Limit switch is faulty.
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