LESSON 3
ISOLATE MALFUNCTIONS TO MODULE LEVEL IN THE
INTER-ORAL DENTAL X-RAY
3-1.
GENERAL
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.
3-2.
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.
MD0361
3-2