ISOLATE MALFUNCTIONS TO MODULE LEVEL IN THE
INTER-ORAL DENTAL X-RAY
This lesson covers the general procedures you will use to isolate malfunctions in
the X-ray, inter-oral, dental to the module level. This lesson also explains the X-ray's
theory of operation and some of the safety hazards resulting from defective X-ray
modules that preclude operation of the unit until you have made repairs.
HELIODENT 70 MODULES
This lesson further describes the modules discussed in Lesson 1.
a. Power Equipment. Power equipment consists of circuit boards found in the
X-ray control, the transformer, and the protective device. The protective device consists
of a variety of slow and medium slow blow fuses. Refer to figures 3-1, 3-2, and 3-3 for
the location of these devices.
Figure 3-1. X-ray control, external view.