ISOLATE MALFUNCTIONS TO THE COMPONENT LEVEL
IN THE DENTAL OPERATING UNIT
Whenever the dental operating unit malfunctions, you must troubleshoot to
determine the cause. In this lesson, you learn how to isolate the cause of a variety of
malfunctions in the A-DEC Model 4200 Dental System dental operating unit. As a
medical equipment repairer, you perform this task whenever the dental operating unit
malfunctions. The following procedures for isolating defective components are
examples of the methods used to isolate all common malfunctions. You must correct
malfunctions before returning the dental operating unit to service. For further
information on isolating malfunctioning components of the A-DEC Model 4200 Dental
System dental operating unit, refer to the manufacturer's service literature or the
manufacturer's service representative.
TROUBLESHOOT A WATER SUBSYSTEM MALFUNCTION
If you find there are air bubbles in the water system, you could find the cause in
several areas. Use the following procedures to isolate the actual malfunction.
a. Air Bubbles in the Water System at the Water Regulator.
(1) Determine if there is a defective O-ring on the connection tube at the
syringe terminal (head). Refer to figure 5-1.
Figure 5-1. Syringe head.