SITUATION: You are troubleshooting malfunctioning components in the dental chair.
Refer to the Dental Chair Model JSR Troubleshooting Guide in the appendix to answer
exercises 4 through 6.
The dental chair or lift will not operate. Which of the following could be a probable
a. Faulty wiring harness.
b. AUTO/MANUAL mode switch is set to AUTO.
AUTO/MANUAL mode switch is set to MANUAL.
d. Brake fails to release.
The dental chair or lift will not operate. You are testing for the probable cause of a
bent or broken foot control switch. What testing procedure do you use?
a. Remove the foot switch from the pedestal 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 AUTO/MANUAL mode switch on the electrical junction box to the
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.
Ensure the AUTO/MANUAL mode toggle switch is set to AUTO.
d. Make a visual inspection of all switches and motors.
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