Which of the following statements concerning operation of the dental chair in the
automatic operating mode is correct?
a. Changing the setting of R36 changes the time constant.
b. The length of time that K1 and the seat tilt motor are energized does not
depend upon the setting at R36.
Changing the setting on R36 has no effect on the length of time required for
C36 to charge up enough to exceed the control voltage.
d. Changing the setting on R36 causes the motor to run longer and the seat to
tilt farther back.
Which of the following is a reason for using the Dental Chair Troubleshooting
Guide when isolating a malfunction?
a. It ensures you will find the cause for the malfunction, maladjustment, or
b. It provides a detailed listing of all possible causes for a malfunction.
It replaces a need for the repairer to have experience isolating malfunctions
on the dental chair.
d. It reduces the amount of time normally required to locate the cause of a
You are troubleshooting malfunctioning components in the dental chair.
Refer to the Dental Chair Troubleshooting Guide in the appendix to
answer exercises 5 through 8.
The dental chair or lift fails to operate. Which of the following could be a probable
a. Faulty potentiometer wiring harness.
b. Broken chain.
Bent or broken lift control switch.