REMOVE AND REPLACE OR REPAIR DEFECTIVE COMPONENTS OF
THE DENTAL CHAIR AND STOOL
After you have isolated a malfunction, you must remove and replace or repair the
component that is malfunctioning. The components covered in this lesson represent
only a portion of the total number of components that could malfunction. However, the
skills required to correct the malfunctioning components are transferable to correcting
all malfunctioning components. You need a medical equipment repairer's tool kit
including at least the following equipment:
a. Seven-sixteenths inch open-end or box wrench.
b. Five-sixteenths inch Allen wrench.
c. Phillips screwdriver.
d. Flat-tipped screwdriver.
e. Three-eights inch wrench.
f. Three-fourths inch open-end wrench.
REPLACING A FAULTY MANUAL CONTROL SWITCH
The dental chair does not function properly. You have isolated a malfunction to a
faulty manual control switch, e.g., manual control switch for chair back (one each for the
doctor's and assistant's controls), or the manual control switch for the chair seat (one
each for the doctor's and assistant's controls). After testing per the Dental Chair Model
JSR Troubleshooting Guide, you have no readings. Therefore, the corrective action you
must take is to remove and replace the switch assembly. Refer to figure 3-1.
a. Disconnect the external power source.
b. Remove the two screws that secure the malfunctioning switch bezel to the
c. Pull the malfunctioning switch bezel from the chair.